China Safety Science Journal

LI Hua, FU Gui

2019, 29(7): 1-5. doi:10.16265/j.cnki.issn1003-3033.2019.07.001

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To conduct safe production work more effectively, it is necessary to keep studying the definition and content of hazards. Through analyzing the definition of hazards in ISO 45001 and that of hazard-related terms in other relevant standards at home and abroad, this paper explains the relationship between them and the content and classification methods of hazards. The results show that source of danger, accident cause, hidden danger, hazard factor, risk source, hazard and risk source all carry the same meaning. Hazard defines the states of energy, matter, and behaviors. It is also demonstrated that the classification of hazards depends on the cause model of accidents. The rules regarding definition will be different since the legal system of China varies from the international legal one, so the double prevention mechanism is a theory with Chinese characteristics.

Research on VIV prediction model and influence factors of deep-water risers

LUO Zhengshan, CAI Mengqian

2019, 29(7): 6-11. doi:10.16265/j.cnki.issn1003-3033.2019.07.002

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This research is carried out in order to improve the effectiveness of predicting the VIV of deep-water risers under the collective action of multiple factors. Firstly, based on Euler-Bernoulli beam bending theory and improved Van Der Pol wake oscillator equation, the VIV predication model of marine risers was established considering the effects of internal fluid flow and cross-flow (CF) and coupled in-line (IL), a differential equation was derived by using hermit interpolation function, and Newmark-β method was used to solve the displacement of risers in time domain through iterative solution. Then a VIV experiment was conducted to verify the prediction model. Finally, the effects of sea current flow velocity, internal and external flow velocity and top tension on VIV characteristics of deep-water risers were discussed. The results show that the vibration frequency and amplitude of a riser will increase as the sea current velocity increases, the natural frequency of risers may be reduced to the range of lock frequency along with the increase of internal flow velocity, accelerating the fatigue failure of risers, and influence of internal flow is obviously suppressed by the top tension, the two-way coupling effect should be given sufficient attention in the vibration analysis of risers.

Influence of abusive leadership on work deviation behavior of knowledge-based employees: a moderated intermediary model

NIU Lixia, LIU Yong, LI Naiwen

2019, 29(7): 12-19. doi:10.16265/j.cnki.issn1003-3033.2019.07.003

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In order to explore the influence mechanism of abusive leaders on the deviation behavior of knowledge workers, a random sampling method was used to conduct a questionnaire survey, and the hypothesis model was verified by mediation effect and regulation effect analysis. The results showed that:There was a significant positive correlation between abusive leadership, job burnout and deviant behavior, a significant negative correlation between organizational cognition and job deviant behavior, and a significant negative correlation between abusive leadership and job burnout.Abusive leadership can not only directly predict employee's work deviation behavior in a positive way, but also indirectly affect employee's work deviation behavior through a path: through the intermediary role of organizational cognition, the intermediary role of job burnout and the chain intermediary role of organizational cognition and job burnout. It can effectively restrain employees' work deviation behavior and reduce the loss of the company by improving their leadership style, improving their organizational cognitive ability and reducing their job burnout.

Cause analysis of chemical accidents based on improved cusp catastrophe model

PEI Jiakun, WANG Feiyue, GUO Huanhuan, YANG Chenyu, PEI Chongwei

2019, 29(7): 20-25. doi:10.16265/j.cnki.issn1003-3033.2019.07.004

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In order to better reflect the sudden change of system safety state caused by the continuous changes of accident-causing factors in the process of chemical accidents, analysis was made on the cause mechanism of chemical accidents with inherent hazards of the production system and the unsafe factors in the production process being taken as internal and external causes; then the traditional accident-causing cusp catastrophe model was improved with system safety being the state variable and inherent hazards and unsafe factors as the control variable to evaluate the influence of people-machine-administration-environment-material-energy on the system safety comprehensively; finally, the process and conditions of chemical accident causes were studied based on the improved model and its feasibility was verified through relevant accident cases. The results show that chemical accidents were caused by a combination of inherent hazards and unsafe factors and the system state would change from safe to accident when the risks of these two factors reach a certain level.

Study on prediction of rock burst by multi-dimensional cloud model based on improved combined weight

HUANG Jian, XIA Yuanyou, LIN Manqing

2019, 29(7): 26-32. doi:10.16265/j.cnki.issn1003-3033.2019.07.005

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Rockburst is one of the main geological disasters in underground excavation and the classification prediction of its intensity is a worldwide problem that needs to be solved urgently. In view of the uncertainty in prediction, the rock shear stress to uniaxial compressive strength ratio σ_θ/σ_c, the rock uniaxial compressive strength to tension strength ratio σ_c/σ_t and elastic energy index W_et were selected to define the rockburst evaluation indexes. The entropy weight combined with improved CRITIC method was adopted to determine the weighting coefficient of each evaluation index. Combined with the theory of artificial intelligence with uncertainty, the algorithm of backward cloud generator was used to establish 3 digital features of the multi-dimensional cloud model and generate the multi-dimensional cloud model including all the prediction indicators. Finally, the accuracy and validity of the proposed model were validated with case data of 48 groups of typical rockburst both at home and abroad. Furthermore, results obtained by the proposed model were compared with those got by cloud model based on weighted fusion and one-dimensional cloud model. The results show that the proposed model has higher accuracy in rock burst prediction.

Numerical simulation on flame propagation characteristics of premixed H₂/Air in sudden expansion ducts

ZHANG Ying, SONG Yuhan, JIANG Shuai, LI Yuntao, SHEN Shifei, CHEN Yue

2019, 29(7): 33-38. doi:10.16265/j.cnki.issn1003-3033.2019.07.006

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To explore the characteristics of premixed Hydrogen/Air flame propagation in sudden expansion ducts, the flow structure, flame shape, flame speed and overpressure of flame through the ducts with various expansion angles β were numerically investigated by Flacs based on the k-ε model and the β-flame thickening model. Results shows that the premixed Hydrogen/Air flame undergoes stages of extinction and re-ignition in the sudden expansion ducts under various angles of β.The flame propagation distance in the ducts increased obviously with the angle β.Baroclinic effect can inhibit the intensity of the vortex in the flow field, and hence weaken the forward transport of fuel.This inhibit effects decrease with the expansion angle β.

Study on influence of fire location on indoor fire

LI Ruiqi, YANG Mo, XU Hongtao, WANG Zhiyun

2019, 29(7): 39-44. doi:10.16265/j.cnki.issn1003-3033.2019.07.007

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In order to study the influence of fire location on heat and mass transfer and smoke hazard in the room when a fire occurs, the indoor fire model was constructed by using fire dynamics simulator, and the indoor fire simulation experiments were carried out. Three cases with different fire source locations were set up. After verifying the rationality of the model, the numerical simulation was carried out. The changes of velocity field, temperature field and FED in three cases were discussed. Results show that in the horizontal direction, the maximum influence of indoor fire passing through the door on the outdoor is 66.7% of the room's horizontal length, and that when the fire source is located in the geometric center of the room's ground, the time required from the start of fire to the lethality of smoke is the longest, which is 21.75% more than the shortest scene.

Study on correlation between fire traces and fire condition of rock wool color steel plates

CHI Jiaping, JIN Jing, LUAN Linshuo

2019, 29(7): 45-50. doi:10.16265/j.cnki.issn1003-3033.2019.07.008

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To study the characteristics of fire traces of rock wool color steel plates in fire field, two kinds of heat sources, muffle furnace and oil pan fire, are used to simulate the fire site. Firstly, given the simulation of fire field radiation under ideal conditions, the thermal radiation temperature of muff furnace was adjusted to study its influence on the characteristics of fire traces. Secondly, with a stable combustion heat source of oil pan fire, the heating condition was changed by controlling the distance between the color plate and oil pan. Finally, the trace characteristics of core and metal sheet were observed after heating. The results show that with the increase of temperature, the core appears to be fluffier. It will shrink and deform at 600 ℃ and get cracking at 1 000 ℃, and metal plates also show damages at various degrees with paint falling off and pits, cracks and other damage marks these results provide a basis for determining fire spreading direction, fire location and point in fire investigation of color steel plate buildings.

Study on explosion characteristics of ultrafine aluminum powder in a closed spherical space

QU Jiao, DENG Jun, WANG Qiuhong

2019, 29(7): 51-57. doi:10.16265/j.cnki.issn1003-3033.2019.07.009

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In order to understand the explosion hazard of ultrafine aluminum powder in a closed spherical space, its explosion characteristics under different test conditions were studied and the effects of dust concentration C_D, oxygen concentration C_O₂ and average particle size of dust d₅₀on explosion parameters (maximum explosion pressure P_max, maximum pressure rise rate (dP/dt)_max and explosion rate K_st) were analyzed by using a standard 20 L spherical explosive device. The results show that the minimum explosion concentration of ultrafine aluminum powder was in the range of 50-80 g/m³, for 100 nm aluminum powder, its P_max increases first and then decreases while (dP/dt)_max and K_st increase with the increase of C_D, and it will be strongly explosive when the C_D reaches 2 000 g/m³, in the oxygen-poor environment, with the decrease of C_O₂, the oxidation rate of ultrafine aluminum powder, the heat released and P_max and (dP/dt)_max will decrease, for aluminum powder with particle sizes of 800 nm, 2 μm and 10 μm, the powder's specific surface area will decrease, the diffusion of oxygen molecules will reduce, and P_max and (dP/dt)_max also will decrease with as the dust particle size of dust grows when the oxygen concentration maintains the same.

Study on influence of pipelines' bending angle on coal dust explosion induced by gas explosion

YANG Qianyi, SHI Biming, ZHANG Leilin, WANG Chao, ZHANG Hongzhi

2019, 29(7): 58-63. doi:10.16265/j.cnki.issn1003-3033.2019.07.010

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This paper is conducted to study the propagation law of coal dust explosion induced by gas explosion in different curved roadways. Firstly, pipelines with different bending angles were used to simulate the underground curved roadway structure. Then the coal dust explosion experimental system was used to test the shock wave pressure value and flame propagation velocity at different locations. Finally, study was carried out on the variation law of coal dust explosion shock waves in pipelines with different turning angles and that of the flame before and after the turning. The results show that with a certain gas filling length, the shock wave's peak overpressure of deposited coal dust explosion decreases at first and then increases, and it decreases sharply after reaching the corner. Its attenuation rate is augmented as the turning angle of pipelines increases, and the larger the angle is, the faster the attenuation of peak overpressure is, it is also found that the flame spreading velocity first increases and then decreases, and it increases abruptly after going through the curved pipe. Its change rate increases with the increase of the angle, and the larger the angle is, the greater the velocity increases.

Application of convolutional neural network-based 3D posture estimation in behavioral analysis of construction workers

XIONG Ruoxin, SONG Yuanbin, WANG Yuxuan, DUAN Yanjuan

2019, 29(7): 64-69. doi:10.16265/j.cnki.issn1003-3033.2019.07.011

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In order to facilitate an automated behavioral analysis of construction workers, CNN was applied for 3D human pose estimation on sequential images. Considering the complicated site environment and dynamic operator behaviors, the data set of construction workers' postures was developed and the performance of the proposed algorithm was analyzed from both qualitative and quantitative aspects. Furthermore, the derived 3D postures in the video were used to drive the biomechanical model for more detailed and quantitative analysis of worker behavior. The results show that the proposed 3D pose estimation method is accurate and robust, and that combined with biomechanical model, more detailed analysis and evaluation of workers' behavior can be achieved.

Analysis of human factors of elevator accidents based on HFACS

XU Surui

2019, 29(7): 70-75. doi:10.16265/j.cnki.issn1003-3033.2019.07.012

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In order to figure out the main human factors leading to elevator accidents and the relationship between human factors, 53 elevator accidents were taken as samples, and HFACS was used to carry out the classification and analysis of elevator accidents. Then the correlation between human factors in the upper and lower levels was discussed by chi-square test and ratio analysis. Finally, countermeasures for preventing elevator accidents were put forward from the perspective of organization and individual. The results show that the lack of safety culture, violation, skill error, inadequate supervision and supervision violation are human factors which occur more frequently in leading to elevator accidents, that poor mental state, inadequate preparation, physical or intellectual deficiencies and technological environment are main causes of unsafe behavior, and that the root causes of unsafe behavior reside in the lack of safety culture and resource management loopholes.

Road alignment induction sign setting method adapting to visibility change

ZHANG Weihua, ZHANG Xin, CAO Shiquan, FENG Zhongxiang, QIU Meng

2019, 29(7): 76-83. doi:10.16265/j.cnki.issn1003-3033.2019.07.013

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In order to improve the driver's perception accuracy of road alignment changes when the sight distance decreases, and to ensure the driving stability and safety, the method of setting dynamic alignment signs on the road was studied. Considering the geometric parameters of road horizontal curve and the requirement of driver's safe driving sight under the influence of visibility, geometric equations of horizontal curve section and driving sight adapting to visibility variation were constructed, and the calculation method of optimizing the starting position and setting spacing was put forward. The validity of the proposed method was verified by driving simulation tests. The results show that after setting dynamic linear induction signs by the above method, the vehicle speed difference in curved road has little change, the lane offset is reduced, and the steering wheel angle amplitude is reduced.

Experimental study on mix proportion of magnetic sealing slurry for gas drainage borehole

LIU Chao, YANG Mingyang, SU Junkai, ZHAO Yajie

2019, 29(7): 84-89. doi:10.16265/j.cnki.issn1003-3033.2019.07.014

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In order to explore the mix proportion of sealing slurry with the character of magnet for gas drainage borehole, carbonyl iron powder with micron size (3 μm) and ferro-ferric oxide (Fe₃O₄) with nanoparticle size (200 nm) were selected as magnetic particles, and polyvinyl alcohol and water in a certain proportion were taken as the main base liquor of sealing slurry. Then the slurry mixing ratio experiments under multi-level and multi-factor conditions were carried out according to different mass fractions of magnetic particles in the slurry and different types and particle sizes of magnetic particles. Similar material simulation experiments were conducted by means of three-dimensional magnetic imaging system. Magnetic tracking effect of the slurry was verified. The results show that adding a certain amount of Fe₃O₄ into the slurry with carbonyl iron powder as the main solute can greatly reduce the sedimentation rate of the sealing slurry, that after the sealing of similar materials, the magnetic properties in the slurry can better characterize the filling and bonding cementing position of the sealing slurry in similar materials, and that in similar materials,the internal cracking will be more obvious in areas with larger magnetic strength.

Influence study of pipes with many small holes on gas drainage by bedding boreholes

TANG Mingyun, ZHENG Pengxian, DAI Guanglong, YAO Guanlin, DUAN Sanzhuang

2019, 29(7): 90-96. doi:10.16265/j.cnki.issn1003-3033.2019.07.015

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For the sake of exploring the degree of influence of pipes with many small holes on the gas drainage by bedding boreholes, a gas-solid coupling model of coal seam was established on the basis of the fracture-pore dual media and gas drainage numerical simulation of pipes with many small holes in different layouts along coal seam was carried out. Besides, field experiment was conducted in the 11-2 coal seam of Pansan Coal Mine, and the actual gas drainage effects of cases having or not pipes with small holes in the boreholes was compared and analyzed. The results show that the application of pipes with many holes leads to the lowest residual gas pressure and content around the borehole, with the significant decrease of gas content around the borehole, the influence of pipes with small holes on gas drainage will be further enhanced with the increase of extraction time.

Analysis of haze visibility's influence on vehicle collision probability

GONG Yan, WEI Chen

2019, 29(7): 97-103. doi:10.16265/j.cnki.issn1003-3033.2019.07.016

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This study is conducted to explore the influence of road visibility on vehicle collision probability in haze weather. Firstly, relevant data of some road networks in Beijing were collected when haze weather occurs, including road visibility, average velocity of vehicles, driver's visibility and deceleration data, etc. Secondly, through analyzed the collected data, a deceleration characteristic model was constructed to reflect the deceleration characteristics of drivers with different visibility in each time periods when haze weather occurs. Further, a driver's vehicle speed model was constructed to calculate that the range of the vehicle speed exceeds the average road speed with different visibility in each time period when haze weather occurs.Finally, by comparing the average value of velocity difference features obtained from collected data with the actual collision probability, the high incidence regions of vehicle collisions in each time period when haze weather occurs are counted out. The results show that the road visibility is positively correlated with the average velocity of vehicles, and the influence of visibility should be fully considered when adjusting deceleration intensity and deceleration characteristic value. By comparing the values of the range beyond the speed limit, the time period when the vehicle speed needs to be focused on is pointed out.The real-time average value of vehicle speed difference features is positively correlated with the actual collision frequency, which can be used to estimate the vehicle collision probability. The visibility regions corresponding to the highest vehicle collision probability in each time period are different, and these visibility regions are the high incidence regions of vehicle collisions.

Research on saccade behavior of drivers in extra-long urban underwater tunnel curves

JIAO Fangtong, DU Zhigang, WANG Shoushuo, CHEN Yun, MA Zhaoyou

2019, 29(7): 104-109. doi:10.16265/j.cnki.issn1003-3033.2019.07.017

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In order to explore the changing characteristics of driver's saccade behavior when driving in the extra-longurban underwater tunnel curves, the saccade angle was taken as the main research object and the actual vehicle test was carried out in different curves and straight sections of East Lake tunnel in Wuhan. Saccade behavior was analyzed by considering the variation of the fixation distribution, horizontal viewing angle and visual distance. In the characteristic analysis, the variation characteristics of saccade angle in different curves were studied with the mean absolute deviation as the evaluation index. The results show that the main saccade angle of drivers is small when driving in different alignments of extra-long underwater tunnel, that the mean absolute deviations of radius 400, 680, 1 000 m and straight section are 2.876, 4.545, 5.010 and 6.324 respectively, and that with the decrease of the curvature of the curve, the median, mean, and range of change of the driver's saccade angle become larger, the driver's saccade range is wider, the psychological pressure is smaller, and driving becomes safer.

Experimental study on influence of CO₂ cracking on pore permeability and fractal characteristics of coal

PENG Xin, JIANG Zebiao, XIE Xionggang, DENG Chuan, XU Shiqing, SUN Yue

2019, 29(7): 110-116. doi:10.16265/j.cnki.issn1003-3033.2019.07.018

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Coal and gas outburst seams generally have the characteristics of high gas content and low permeability. In order to eliminate coal and gas outburst, coal samples from Dayun Coal Mine, Guizhou Province were studied and the method of carbon dioxide cracking was used to carry out low temperature nitrogen adsorption experiments to compare the microscopic pore changes of coal before and after cracking. The static volumetric method was used to test the coal samples with pore size between 3 nm and 200 nm before and after CO₂ cracking. The fractal theory was used to quantitatively describe the effect of CO₂ cracking on the inner surface of coal rock pores. The results show that the carbon dioxide cracking has a significant effect on the pore structure of the coal seam within 3 m, that the coal sample after the cracking has a significant reduction in the specific surface area and the diameter of the most pores, and an obvious increase in the average pore diameter and pore volume, that the effect of cracking on microporous damage is remarkable, and the number of micropores after splitting is reduced by an order of magnitude, with a maximum decrease of 83.93%, that the fractal dimension of raw coal is reduced from 2.705 93 to 2.553 78 after cracking, which indicates that the pore surface of Guizhou coal seam is complex and rough, and the use of carbon dioxide cracking can make the pore surface of coal seam smooth, and that specific surface area and fractal dimension have a positive correlation.

Design of orbital climbing robot system and image processing

QIN Haiwei, LU Congfei, JIANG Yongsheng, ZHOU Xu, CHENG Bin

2019, 29(7): 117-122. doi:10.16265/j.cnki.issn1003-3033.2019.07.019

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In order to solve the problem that current bridge inspection for high-rise structures such as bridge pylons and piers is time-consuming, costly and inaccurate, a track-type climbing robot system was developed and a processing method of detection images was proposed. The system consists of three parts: mechanical platform, visual platform and control platform. The visual platform is placed on the mechanical platform and both of them are remotely controlled by the control platform to capture the interval and continuous surface images of the structure. The SIFT algorithm is used to splice the detected images according to the position information to generate the bridge panorama. The prototype experiment was conducted by setting up an experimental platform with a cracked image background. The results show that compared with the existing detection methods, the designed robot system is more rapid and stable, and the panorama can be generated by the image processing method, which will help improve the level of bridge detection and maintenance.

Experimental study on factors influencing performance of pneumatic vortex spray curtain and its optimization

CHEN Jingxu, JING Deji, GE Shaocheng

2019, 29(7): 123-128. doi:10.16265/j.cnki.issn1003-3033.2019.07.020

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In order to learn about the atomization performance of the pneumatic vortex spray curtain device, a similar experimental platform was set up according to the formation mechanism. Multi-factor orthogonal tests were designed considering main influencing factors and the atomization performance prediction model was obtained by multi-factor regression analysis. Experiments were carried out to verify the dust removal effect of the device. The results show that the jet wind speed is positively correlated with the atomization radius and it has great influence on the radius, that the spray working angle and the atomization pressure are negatively correlated, and that the squence of factors affecting atomization radius from big to small is the jet wind speed, the spray working angle and the atomization pressure. The dust removal effect experimental results prove that the pneumatic vortex spray curtain can isolate the high concentration dust, that the removing efficiencies of dust and respirable dust are 93.03% and 87.75% respectively, and that the effect on dust collection is more significant.

Structural equation model between safety accidents and organizational culture of construction enterprises

ZHANG Jianshe, LUO Chunyang, CHENG Mengyuan, ZHAO Yifan

2019, 29(7): 129-136. doi:10.16265/j.cnki.issn1003-3033.2019.07.021

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To further explore how safety accidents affect the organizational culture of a construction enterprise, the connotations of organizational culture and five dimensional factors were firstly defined, including facilities environment, institutional environment, relevant party environment, safety values, and behavioral patterns, followed by an analysis on the effect pathways of safety accidents on each dimension as well as an empirical test by using SEM. The results show that safety accidents have a significantly direct impact on facilities environment, institutional environment, and relevant party environment, among which the influence on facilities environment and institutional environment is greater than that on the relevant party environment. Secondly, safety accidents have a significantly indirect impact on safety values and behavioral patterns, among which its indirect impact on behavioral patterns is higher than that on safety values. To reduce the impact of safety accidents on organizational culture, the construction enterprise can improve the environment of the construction site, strengthen the establishment of safety systems and improve its reputation, etc.

Research on application of generalized safety model on community safety management

FENG Wei, WU Chao, CHEN Yuanjiang

2019, 29(7): 137-142. doi:10.16265/j.cnki.issn1003-3033.2019.07.022

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In order to conduct community safety management and accident prevention work more systematically and comprehensively, a research on GSM-based community safety management model was made following the principle of safety & safety science. Firstly, the cause modes of community accidents and the prevention implementation plans were analyzed under the guidance of GSM in combination with the features and importance of SIS. Then the community safety system management model was constructed and applied to the management of fire hazards in community malls in our country. The research results show that the essence of this safety management model relies in its “four defenses” of accident prevention, and the model can play a positive role in promoting community safety management with comprehensive, purpose-oriented, dynamic, practical and reliable features.

Research on composition and classification of cost elements of emergency response to work safety accidents

YANG Jia, HUANG Yuecheng

2019, 29(7): 143-149. doi:10.16265/j.cnki.issn1003-3033.2019.07.023

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In order to give a basis for cost classification of emergency response to work safety accidents, regular pattern of emergency response activities in production safety accidents was analyzed, and the cost elements of the response activities involved were identified by literature review and the method of process mapping. According to the elements and the asset function defect repair theory, costs were divided into four categories: human resource, material resources, financial resources and opportunity loss, and connotations of costs were explained. Besides, accident emergency response cost iceberg map was constructed based on attributes of costs. Finally, a two-dimensional classification table of accident emergency response costs was given. Results show that the proposed four emergency response costs and the classification table clarify the method for the government to calculate and evaluate costs and provide new ideas and references for the optimization of the emergency response funding model.

Research on development of safety engineering major under background of emerging engineering education

TONG Ruipeng, ZHANG Yanwei, YANG Yunyun, XU Surui, JIANG Wei, FU Gui

2019, 29(7): 150-155. doi:10.16265/j.cnki.issn1003-3033.2019.07.024

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In order to effectively cope with the new round of technological and industrial transformation, new ideas for the development of safety engineering discipline construction were explored under the background of emerging engineering education. Firstly, the discipline characteristics of safety engineering specialty were analyzed and its research field was identified at the present stage. The development direction of safety engineering discipline construction was determined in combination with the requirements of new engineering construction. Then integration, addition, upgrading and other measures were used to optimize the curriculum and an intelligent classroom teaching system was built by the use of emerging multimedia, big data, virtual reality and other technologies. Finally, measures such as optimizing the allocation of resources and establishing a long-term effective mechanism for teaching team construction were proposed to promote personnel training mechanism. The results show that the emerging engineering education plays an important guiding role in the development and transformation of the current safety engineering specialty, and that the proposed improved safety engineering teaching system and personnel training mechanism can meet the current and future development needs.

Study on double combination evaluation method of urban comprehensive disaster risk

XIA Chenhong, WANG Wei, MA Donghui, SU Jingyu

2019, 29(7): 156-163. doi:10.16265/j.cnki.issn1003-3033.2019.07.025

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In order to solve the problem of inconsistency in the evaluation results obtained by different single methods, an evaluation idea based on the combination of sequencing values and evaluation values was proposed. Firstly, seven typical single methods were used to evaluate the comprehensive disaster risks of 31 provinces, autonomous regions and municipalities directly under the central government in China, and the basic evaluation of urban comprehensive disaster risk was carried out based on the evaluation results by each method. Then using KENDALL concordance coefficient, Spearman grade correlation coefficient and comprehensive support coefficient as criteria of consistency test, the close correlation degree between each single evaluation method was calculated. Besides, the double evaluation model was applied to combine the single evaluation results and repeat the tests. Finally, the highly coordinated ranking and evaluation values of comprehensive disaster risk were obtained. The results show that the dual combination evaluation method can effectively reduce the random deviation and systematic error in the evaluation process, and obtain the risk assessment value and ranking value of high convergence and credibility, which provides a new idea for the assessment of urban comprehensive disaster risk.

Study on risk assessment method of dust explosion and its application

JIN Jianghong, LI Xinlei, WANG Qing

2019, 29(7): 164-169. doi:10.16265/j.cnki.issn1003-3033.2019.07.026

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In order to effectively prevent dust explosion accidents and realize the risk classification and control of dust explosion accidents, a new dust explosion risk assessment method is put forward. Firstly, taking the possibility and severity of dust explosion as the one class index, the distribution of personnel, the layout of buildings, the equipment and facilities and others as the secondary indicators and safety management measures as compensation index, the risk assessment index system of dust explosion was constructed. Secondly, the weights of each index were determined by combining the AHP and the entropy method, and the risk assessment model of dust explosion was established to evaluate and classify the risk of dust explosion. Finally, taking the dust explosion accident of an enterprise as an example, the application of the proposed risk assessment method was studied. The results show that the classification of the evaluation indexes directly affect the risk assessment results of dust explosion, that the safety compensation measures can effectively reduce the risk of dust explosion in enterprises, and that the risk grade of dust explosion in the enterprise is general by using this risk assessment method, which is consistent with the evaluation results of the expert team at national level.

Research on associated early-warning and visualization of hidden danger in enterprise production based on TF-IDF

HU Jinqiu, ZHANG Xiyue, WU Zhiqiang

2019, 29(7): 170-176. doi:10.16265/j.cnki.issn1003-3033.2019.07.027

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In order to effectively utilize the large number of hidden danger records in production process accumulated in the management of HSE, realize the early-warning of hidden danger and solve the problems such as low efficiency, high subjectivity of manual data analysis, a TF-IDF visual model for early-warning of hidden danger was established. Firstly, the Apriori technology was applied to mine the potential associations between various hidden dangers. Then TF-IDF algorithm was introduced to optimize and sort the association rules to find out the critical associations among hidden dangers. Finally, visualization technology was used to display the mining results intuitively. Results show that the proposed TF-IDF visual model can realize the early-warning of hidden danger quickly and accurately, that the optimization of association rules solves the problem of strong dependence of Support in Apriori algorithm, and that mining results can provide the direction and give support for enterprise safety management.

Emergency decision-making method for collaborative management of low-altitude airspace

WANG Zengqiang, DING Jing, BAI Songhao, WANG Zhengshu

2019, 29(7): 177-182. doi:10.16265/j.cnki.issn1003-3033.2019.07.028

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In view of the complexity of multi-department collaborative operations in low-altitude airspace emergency rescue, a multi-department emergency decision-making model based on multi-granularity linguistic information was presented. Firstly, multi-granularity linguistic phrases were employed to express the preference information, and some transformation functions were used to unify the multi-granular linguistic phrases into a uniform linguistic label set. The relative important degree of multiple departments, the cooperative coefficient between different departments and the weight vector of key attributes were obtained. Secondly, the evaluation indexes of key attributes with respect to each combination of alternations were determined considering multi-divisional cooperative. Thirdly, according to combination of evaluation indexes of combination alternatives and the weight vector of key attributes, the comprehensive evaluation value of each combination alternative was determined. Finally, a case study of low-altitude airspace emergency rescue after an earthquake was given to verify the feasibility of the proposed approach. The results show that the proposed collaborative decision-making model considers the uncertainty of the environment and the interaction of collaborative work at the same time, which makes the decision process and the outcomes more practical.

VR based simulation and scenario design of emergency response plans for metro stations

WANG Shuo, ZHU Shiyou, YU Junyan, HUANG Ling

2019, 29(7): 183-188. doi:10.16265/j.cnki.issn1003-3033.2019.07.029

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In order to solve the hazardous problems and manage the difficulty in organization and implementation in case of fire, explosion, flooding, sudden large passenger flow and other emergencies during the real exercise of emergency response plans in metro stations, VR technology is applied to design scenarios and simulate emergency response plans. Firstly, business process modeling and notation (BPMN) language was used to model the process of emergency response plans. Secondly, building information modeling (BIM) technology was applied to create a three-dimensional model of the infrastructure in a metro station. The key technologies involved in plans for fire or explosion, terrorist attack, flooding and sudden large passenger flow were studied and simulated. Finally, with Yantang subway station as an example, the scenario design of an emergency response plan was carried out. The results show that the scenario design and process simulation based on VR technology integrates the elements of various scenarios, event process, passengers' and staff members' activities into the same platform, which can demonstrate the implementation effects of the plans visually and dynamically with multi-viewing panes, therefore helping enhance the application of emergency response plans in metro stations.

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