China Safety Science Journal

Exploration and prospect of training mode of personnel for emergency management in colleges and universities

TONG Ruipeng, ZHAO Xu, WANG Lulu, GUO Zimeng, AN Yu

2021, 31(7): 1-8. doi:10.16265/j.cnki.issn 1003-3033.2021.07.001

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In order to promote modernization of China's governance system and capacity, improve training quality of personnel for emergency management in colleges and universities and to address lack of such talents, a comparison was made in emergency discipline education between China and the United States, and useful experience of the US were drawn. Then, by collecting advice of domestic scholars on development of such personnel and analyzing major issues colleges and universities have in related specialties, a continuously improved training mode was proposed with outcome-oriented concept as framework based on demands, existing problems and relevant specialties. The results show that the major of emergency management is still in its early stages with lots of existing problems. Its general objective is to develop talents capable of intelligent and active management in an era of emergency science and technology, and diverse teaching routes and systematic curriculum system can provide a powerful support for talent training.

Research on methodology of safety & security intelligence science

WANG Bing, HUANG Qingwen, YOU Bo, XU Jiaxin, WU Chao

2021, 31(7): 9-14. doi:10.16265/j.cnki.issn 1003-3033.2021.07.002

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In order to build a system of SIS methodology so as to perfect theoretic system of SIS, based on fundamental connotation of SIS and methodology, basic meaning of SIS methodology was analyzed, and its main contents were proposed from a theoretical perspective. Then, research principles and paths of SIS were analyzed,and composition of research methods (including general research methods, transplanted research methods, and proprietary research methods) of SIS was explained.The results show that SIS methodology is a systematic research method system of SIS, and its system is composed by SIS research principles, paths and methods.

Bibliometric analysis of engineering project risk management literature

WANG Qiankun, ZHU Ke, WANG Junwu, GUO Peiwen, SHEN Wenzhong

2021, 31(7): 15-23. doi:10.16265/j.cnki.issn 1003-3033.2021.07.003

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In order to fully understand research status and developing trend of project risk management, 1 452 documents collected in the Web of Science Core collection database from 2000 to 2020 were taken as research samples, bibliometric analysis and visual analysis were used as research methods, research situation of project risk management was analysed from the number of papers published and developing trend, group of authors and issuing organization, classic journals and important documents these aspects. The results show that the number of papers and cited times of risk management research in the past 20 years has been increasing year by year, and China is the most important country in the research achievements in this field. Journal of Construction Engineering and Management is the most published hot journals, and the top 10 research institutions are from China, the United States, Singapore, Australia and Iran respectively. Research focus on the subject of project risk management, such as object, method and technology application.

Analysis of coal mine safety investment decision based on entropy weight-TOPSIS method

JIANG Fuchuan, ZHOU Shi, WU Zengtong, ZHONG Jichao, ZHANG Shuhao, ZHANG Xuefang

2021, 31(7): 24-29. doi:10.16265/j.cnki.issn 1003-3033.2021.07.004

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In order to improve decision-making level of coal mine safety investment and make safety input to better ensure safety of coal mine production, evaluation model of safety investment scheme based on entropy weight -TOPSIS was established. Firstly, according to characteristics of safety investment, seven indexes were selected from two aspects of safety investment and safety investment evaluation index system was constructed. Secondly, weight of each index was determined based on entropy weight method, and relative closeness degree of each scheme was calculated with TOPSIS method, so as to realize optimization of scheme and make safety investment decision with input proportion of best scheme as reference. The results show that reasonable safety investment structure is an important prerequisite to realize maximization of safety benefit. This model can effectively select previous safety input scheme which can achieve the maximum output with the least input, which is helpful to improve safety benefit of coal mine.

Research on formation factors of miners' unsafe emotions based on DEMATEL-ISM

LI Guangli, YAN Yizhi, LIU Wenqi, CHEN Yaoguang, WU Zeyu

2021, 31(7): 30-37. doi:10.16265/j.cnki.issn 1003-3033.2021.07.005

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In order to prevent generation of unsafe emotions of miners and improve reliability of human factors, it was particularly important to systematically analyze importance and hierarchical relationship between factors forming unsafe emotions of miners. Based on literature and interview research, 12 miners' unsafe emotions formation factors were determined through Delphi method. Thought decision making trial and evaluation laboratory method,12 miners' unsafe emotions formation factors were gathered into four factors sets, respectively strong cause factor set, weak cause factor set, strong result factor set and weak result factor set. A multi-level hierarchical structure model of miners' unsafe emotions formation factors was constructed through further adopted ISM method. The results show that formation of miners' unsafe emotions is the result of a combination of direct factors, middle factors and deep-seated factors. Insufficient job competence, poor safety attitudes and behaviors of managers, restricted career development, poor interpersonal communication, inadequate safety culture atmosphere, and unsatisfactory welfare benefits are the key factors affecting formation of unsafe emotions of miners, should be given priority attention.

Evolutionary game analysis of public-private cooperative supervision considering trust:taking medical waste management generated from COVID-19 as example

CAO Cejun, ZHU Yanqing, ZHANG Fanshun, LI Xiaoli, YANG Qin

2021, 31(7): 38-47. doi:10.16265/j.cnki.issn 1003-3033.2021.07.006

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To upgrade performance of cooperation between government and private enterprise, corresponding evolutionary game models were proposed on basis of constructing public-private cooperation payoff matrixes without and with considering level of trust. Strategies evolution trend of government and private enterprise in managing medical waste generated from COVID-19 under different situations were analyzed. Through numerical examples, evolutionary trajectory of public-private cooperative supervision strategies without and with taking trust level into consideration were implemented, and impact of punishment cost on evolutionary trajectory of both parties in game was analyzed. The results show that it is necessary to devise a punishment mechanism to avoid opportunistic behaviors of private enterprise and establish a trust mechanism to guide private enterprise to provide better quality service for managing medical waste generated from COVID-19.It can make goal regarding maximization of overall profit come true and promote sustainable development of the whole system.

Study on influence of group dynamics on miners' unsafe behavior intention

LI Miaohui, LI Jizu

2021, 31(7): 48-55. doi:10.16265/j.cnki.issn 1003-3033.2021.07.007

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In order to give full play to positive role of group dynamics in the working group of coal mining enterprises and effectively prevent occurrence of UBI of miners, on the basis of reviewing and analyzing literature, hypothetical model of relationship between miners' group dynamics, PS, interpersonal relationship and UBI was established. Taking 296 front-line team members of coal mining enterprises as research object, mediating effect of PS and moderating effect of interpersonal relationship were tested based on SEM and hierarchical regression respectively. The results show that there is a significantly positive correlation between group cohesion, group appeal, group driving and PS. There is a significantly negative correlation between group pressure, group dissipative force and PS. PS is significantly negatively correlated with miners' UBI. PS plays a mediating role between group cohesion, group pressure, group dissipation force and miners' UBI. Interpersonal relationship plays a moderating role in group cohesion, group driving, group pressure and PS.

Safety thickness and dynamic characteristics of rock pillar of uncovering coal at rock cross-cut in Guigala tunnel

XIE Quanmin, YAN Lixiang, ZHOU Shengguo, WANG Zhide, YANG Wendong

2021, 31(7): 56-62. doi:10.16265/j.cnki.issn 1003-3033.2021.07.008

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In order to address geological disasters such as gas leakage, explosion, coal seam outburst, extrusion and pulsion in construction of highway tunnel with coal-bearing strata, with Guigala tunnel of Laze highway as research object, theoretical analysis on structural mechanics was conducted, and blasting damage range size of rock pillar and its safety thickness under pressure of coal seam gas were considered to deduce calculation formula of safety thickness for uncovering coal at rock cross-cut in tunnels with different inclination of coal seams, by using which safety thickness in Guyala tunnel was obtained. Then, numerical simulation was applied to establish a dynamic model of uncovering coal at rock cross-cut in highway tunnels with coal-bearing strata, dynamic characteristics of coal seam and its roof and floor, which was under millisecond time of cutting blasting of the uncovering coal, were studied, and dynamic response characteristic of coal seam contacting roof and floor were acquired. The results show that safety thickness of rock pillar at 8m in Guyala tunnel is reasonable. Dynamic response strength decreases as millisecond interval time increases, and the best interval for uncovering coal at rock cross-cut is 50ms. However, the strength increases along with increase of coal seam dip angle, so it is necessary to properly reduce coal uncovering depth in steeply inclined and inclined coal seams and increase that of gently inclined coal seams.

Study on influence of installation method on thermal cracking behavior of float glass

ZHANG Yanni, WEN Xinyu, FENG Zhichao, LIU Chunhui, HOU Yunchao

2021, 31(7): 63-69. doi:10.16265/j.cnki.issn 1003-3033.2021.07.009

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In order to study influence of different installation methods on cracking behavior of float glass in the process of building fire development. Taking float glass with size of 600 mm×600 mm×6 mm as research object. Five installation modes were adopted, such as point support, frame support (4 side shielding, left and right shielding, upper and lower shielding) and no shielding, crack behavior of float glass under different installation modes under thermal load was analyzed, characteristic parameters such as the first crack time, glass surface temperature and air temperature, crack initiation position and crack propagation behavior of float glass were obtained. The result shows that float glass with non-masking installation mode does not crack under thermal loads, and its fireproof performance is the best. The first crack time of float glass installed with point support is the shortest, cracks are mainly straight cracks, and crack initiation position occurs at the support point of glass, and its fire resistance is the worst.

Influence of dispersion pressure on methane explosion suppression effect of KHCO₃ cold aerosol

WANG Yan, LIN Sen, LI Zhong, WEN Xiaoping, ZHENG Ligang , JI Wentao

2021, 31(7): 70-75. doi:10.16265/j.cnki.issn1003-3033.2021.07.010

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In order to achieve optimum suppression effect of active dusting explosion suppression system, influence of dispersion pressure on dispersion of KHCO₃ cold aerosols was tested, and suppression experiment of the aerosol on explosion of 9.5% methane-air premixed gas was carried out via a 5 L tube testing platform. And suppression effect of KHCO₃ cold aerosols on methane explosion pressure and flame propagation under different dispersion pressure was investigated. The results show that dispersion pressure significantly impacts dispersion of KHCO₃ cold aerosol, thereby affecting its suppression performance on methane explosion. When at low pressure, the aerosol is hard to disperse, so it shows poor explosion suppression effect and can only inhibit early stage flame. But as the pressure increases, its suppression effect gradually improves. However, when it is fully dispersed, such effect can rarely be improved by continuing to increase dispersion pressure.

Constitutive model of coal damage under gas degradation and load

LI Bobo, WU Xuehai, REN Chonghong, XU Jiang, ZHANG Yao, GAO Zheng

2021, 31(7): 76-81. doi:10.16265/j.cnki.issn 1003-3033.2021.07.011

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In order to effectively prevent coal mine gas power disaster, it is necessary to study mechanism of gas degradation of coal and evolution characteristic of coal damage. Raw coal sample was taked as research object, triaxial compression test of coal under different gas pressures was carried out by using triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane. Damage constitutive model of coal under action of gas degradation and load was established, and rationality of model was verified by test results. The results show that cumulative damage of coal is almost 0 before plastic deformation stage, and damage degree increases rapidly after peak.With the increase of gas pressure, peak strength and elastic modulus of coal are both decrease, initial damage of coal increases significantly after gas action. Cohesiveness of coal decreases linearly with the increase of gas pressure. Mohr-Coulomb criterion is modified through relationship between cohesion and gas pressure, and stress-strain relationship of coal considering gas deterioration is quantified. It has a high degree of agreement with test results, which can well reflect damage evolution process of coal under different gas pressures.

Research on bolt detection of railway passenger cars based on improved Faster R-CNN

ZHAO Jiangping, XU Heng, DANG Yueyue

2021, 31(7): 82-89. doi:10.16265/j.cnki.issn 1003-3033.2021.07.012

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In order to ensure operation safety of railway passenger cars, an image defect detection algorithm for key parts of them based on Faster R-CNN target detection is proposed together with two points for improvement considering the algorithm's problems in detecting small-scale bolt targets. Firstly, original VGG16 network was replaced by advantages of deep residual network and Inception network, and upsampling layer was added to solve serious loss of image feature information through convolutional network. Secondly, size and proportion of anchor points in Region Proposal Network (RPN) were optimized through K-means++ clustering algorithm to improve accuracy of generated suggested regions and address inaccurate positioning of defective targets. Finally, comparative experiments on bolt defect dataset created in this paper were conducted. The results show that detection accuracy of improved algorithm reaches 87.4%, which is 8.9% higher than original one. Moreover, its missed detection rate and false detection rate are reduced by 9.9% and 11% respectively for multi-target defects and confused targets.

Emergency plan drilling system based on disaster digital twin

CHEN Chao, YAN Yan

2021, 31(7): 90-96. doi:10.16265/j.cnki.issn 1003-3033.2021.07.013

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In order to improve drilling effect of emergency plans, digital twin technology and augmented reality technology were applied to study establishment method of disasters digital twin, and a new emergency plan drilling system was developed. Through unified data interface, space-based, sky-based, and ground-based remote sensing data and IoT data were continuously collected to construct the disaster digital twin, including geometric expression and physical characteristics. Furthermore, cooperative drilling network conference was created by using photon unity networking engine, disaster digital twin was superimposed in the real space with augmented reality devices, and functions like roam, 3D annotation and voice communication were realized by using gesture recognition mechanism and web real-time communications protocol. The results show that the system can visually and comprehensively reveal disaster situation through utilizing disaster digital twin, thus improving drilling effect of digital emergency plans.

Optimization and experimental study of sealing parameters of crossing boreholes based on creep effect

ZHANG Junxiang, LIU Yanwei, REN Peiliang, HAN Hongkai, ZUO Weiqin

2021, 31(7): 97-104. doi:10.16265/j.cnki.issn 1003-3033.2021.07.014

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In order to address problems of difficult sealing of crossing borehole and low efficiency of gas drainage, with coal rock being regarded as elastic-plastic medium, a mechanical model of roadway surrounding rock was established considering creep effect. Then, control equation of grout flow was derived according to Dracy's law, and a coupling model of surrounding rock deformation and grout flow was constructed with permeability change as a bridge. Finally, the model was resolved by using COMSOL software. The numerical simulation results show that plastic softening zone around roadway expands from 4.69 m initially to be basically stable at 15.19 m in 100 days. And grout radius expands continuously with increase of grouting pressure, and tends to be stable when the pressure is higher than 2.8 MPa. Moreover, the average gas concentration of test boreholes reaches to 56.49%, which is 3.46 times that of traditional technology and still maintains a great drainage level in later period.

Analysis on gas emission characteristics and permeability inversion of hydraulic slotting borehole

HAN Lei, SHEN Chunming, WANG Weihua

2021, 31(7): 105-112. doi:10.16265/j.cnki.issn 1003-3033.2021.07.015

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In order to study influence of hydraulic slotting on borehole gas drainage, underground field test was designed based on theoretical analysis of borehole gas seepage and slotting increasing permeability mechanism, meanwhile,gas emission velocity, cumulative emission and variation characteristics of gas pressure around slotting borehole were investigated. According to gas emission velocity inversion, change process of coal permeability and its influencing factors were discussed and analyzed. The results show that gas emission rate of slotted borehole generally presents four stages of rapid attenuation, including slow attenuation, small amplitude increase and then attenuation, and large amplitude increase, which are related to the stress evolution around slotting, coal mechanical behavior, coal seam pressure water and other factors. After about 40 days of slotting operation, gas emission rate of borehole begin to increase significantly, and gas pressures around slotted borehole decrease. In general, decline rate decreases far away from slotted borehole. Permeability of slotted coal mass shows changing trend that first decreases, then increases slightly, and then increases greatly. Permeability has a negative correlation with gas pressure of surrounding coal seam. Inversion analysis results are consistent with existing simulation conclusions.

Impact on fire-fighting performance of high-valent metal ions cross-linking system

LIANG Zewen, WANG Junfeng, DONG Kaili, ZHANG Yulong

2021, 31(7): 113-119. doi:10.16265/j.cnki.issn 1003-3033.2021.07.016

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In order to compare impact of central ion's high valence state on fire extinguishing performance of gel, with sodium carboxymethyl cellulose cross-linking with aluminum citrate and zirconium citrate, Zr⁴⁺ cross-linking system and Al³⁺ cross-linking system were tested, gelling time was measured and proportioning scheme was optimized. Then, changes of index gases and crossing point temperature were studied through programmed temperature test, and FTIR was adopted to explore flame retardant mechanism of gel. The results show that during programmed temperature process, Zr⁴⁺ cross-linking system reduces generation amount of CO by 56%, and that of C₂H₄ by 54% while crossing point temperature is increased by 32 ℃, and its inhibition effect is better than that of Al³⁺ cross-linking system. Moreover, this system better inhibits oxidation of hydroxyl groups in coal, making methyl and methylene groups less involved in coal-oxygen reactions, and promoting generation of carbonyl groups and oxygen-containing functional groups.

Research on safety impact mechanism of reconstruction of old industrial building

YU Guangyu, LI Huimin

2021, 31(7): 120-129. doi:10.16265/j.cnki.issn 1003-3033.2021.07.017

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In order to reduce the safety accidents in the construction stage of ROIB reconstruction and improve the safety of construction phase, the construction safety impact mechanism is studied according to the characteristics of old industrial buildings. According to the specific construction conditions of ROIB, the risk influencing factors are identified, and the influencing factors are analyzed by PCA and the index system is constructed,SEM is established based on the index system, and the influence mechanism is verified and analyzed, SEM analysis results are analyzed from the influence intensity and the influence path. The results show that the influence of external potential variables on construction safety performance is significant at 0.05 level, and the order of the importance of the factors is personnel factor, construction machinery and materials, construction environment and management and technical factors.

Analysis on time-varying reliability of bridge crane structure based on PHI2

LIU Yuzhen, YANG Ruigang, ZHAO Guangli, JING Weichen, MA Xiaoxing

2021, 31(7): 130-136. doi:10.16265/j.cnki.issn 1003-3033.2021.07.018

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In order to explore impact of cumulative effect of time on cranes' failure probability, a time-varying reliability analysis method for crane metal structures based on improved PHI2 was proposed. With bridge crane as an example, its metal structure's stress was firstly analyzed, and dangerous point which featured the smallest difference with allowable stress of material and allowable rigidity of structure was selected for structural numerical analysis. Secondly, RSM was utilized to construct a function approximately. Finally, outcrossing rate was calculated by using improved PHI2 method so as to obtain cumulative failure probability of metal structure. The results show that reliability index considering cumulative effect of time is significantly lower than that without considering it.

Mining and analysis of association rules in tower crane accident cases

KUANG Yuqi, ZHAO Tingsheng, JIANG Ling,ZHANG Wei

2021, 31(7): 137-142. doi:10.16265/j.cnki.issn 1003-3033.2021.07.019

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In order to make full use of tower crane accidents information and mine deep into tower crane accident characteristics, an improved Apriori algorithm mining pattern was proposed,association characteristics of tower crane accident can be quickly and effectively mined. Firstly, 200 detailed accident investigation reports of tower crane were collected, accident attribute data in accident investigation report were analyzed and extracted, and coded according to the hierarchical structure.Secondly, a pattern suitable for multi-dimensional association characteristic was proposed based on classic Apriori algorithmt, association characteristics between tower crane accident attributes and causes were mined. Finally, tower crane accident association characteristics were analyzed and summarized according to mining results. The results showed that association rules algorithm can effectively utilize investigation of accident reports and mine characteristic of tower crane accidents in a quantitative way. Between tower crane accident attributes and accident causes have a strong association relation.

Comprehensive feature extraction model of outdoor fire hydrant state

CHEN Shiling, XIONG Yong, ZHU Leiji

2021, 31(7): 143-150. doi:10.16265/j.cnki.issn 1003-3033.2021.07.020

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In order to monitor non-safety status of outdoor fire hydrant, such as water discharge, low pressure, overpressure, etc., which affect normal use of rescue water intake function, data filtering processing technology was adopted,based on one-dimensional pressure data, high-order multidimensional expansion of pressure mean value, pressure difference, pressure variance and pressure variance growth rate were carried out, and a comprehensive feature extraction model of outdoor fire hydrant status was proposed. Through combination optimization of sampling frequency and sliding filter window width, pressure data under different conditions were collected, and fitting model parameters were trained. Model was applied to integrated information acquisition intelligent terminal device and installed in outdoor fire hydrant dynamic information monitoring system. The results show that model can accurately judge status of water discharge, low pressure and overpressure, and improve dynamic information safety management level of outdoor fire hydrant.

Model of pedestrian behavior in multi-path evacuation in emergencies

ZHU Wei, WANG Yafei, ZHANG Peng, LIN Tianye

2021, 31(7): 151-156. doi:10.16265/j.cnki.issn 1003-3033.2021.07.021

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In order to study pedestrian behavior in crowded places in emergencies, a two-layer network model was proposed to simulate scenario of multiple paths in densely populated places. Dense layer and sparse layer were set in the model, in which traffic cost of sparse layer was lower. It is used to simulate path with shorter travel time in practice, and traffic cost in dense layer was higher, so it can simulate path with longer travel time in practice. The results show that critical capacity of system increases with increase of agents, and it is more sensitive to the number of agents in the sparse layer, and more pedestrians tend to choose sparse layer to pass. Occurrence of emergencies will lead to reduction of critical capacity of system. Meanwhile, interruption and degradation accidents in the sparse layer are more likely to cause the overall congestion. Congestion can be avoided by controlling flow into crowded places below critical value and avoiding accidents on shorter routes as far as possible.

Study on influence of air curtain on temperature and flow field of subway tunnel fires

TAO Liangliang, ZENG Yanhua, LIU Zhenhan, PENG Junqin, ZHOU Xiaohan

2021, 31(7): 157-163. doi:10.16265/j.cnki.issn 1003-3033.2021.07.022

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In order to explore influence of air curtain on temperature and flow field distribution in subway tunnel, longitudinal temperature, maximum temperature of vault and flow field distribution in tunnel under different HRR(heat release rates) of fire source, air curtain jet velocities and angles were studied by FDS (Fire Dynamics Simulator). The results show that jet velocity of air curtain should be at least 16, 18 and 20 m/s to ensure smoke control effect when HRR is 10, 15 and 20 MW. Increasing jet angle, in cases where it is smaller than 45°, can accelerate temperature attenuation of vault, but such effect will be little as it is more than 45°. Maximum temperature of vault decreases along with increase of jet velocity, but increases with that of jet angle which changes temperature distribution in tunnel by influencing vortex between fire source and air curtain.

Safety performance evaluation of dangerous chemicals transport drivers based on vehicle GPS data

HAN Tianyuan, LI Xuan, LYU Kaiguang, ZHOU Wencai, LIU Yongtao, QIAO Jie

2021, 31(7): 164-171. doi:10.16265/j.cnki.issn 1003-3033.2021.07.023

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In order to improve science and convenience of daily safety performance evaluation of drivers in road transportation of dangerous chemicals, firstly, natural driving data were mined from vehicle GPS to evaluate drivers' safety performance. By using improved piecewise fitting method based on adaptive transformation of coordinate system, dynamic driving data such as driving speed, acceleration, plane curvature, road slope and slope length were extracted. Then, combined with vehicle rollover speed prediction model and brake drum temperature rise model, a safety evaluation system with seven indexes was established, which includes four levels: driving speed stability, vehicle lateral stability, braking stability and driving state stability. Finally, combination weighting method was used to build a 10 point safety performance evaluation model for road transport drivers of dangerous chemicals. The results show that piecewise-fitting method based on adaptive transformation of coordinate systemreduces fitting residual by 19.23% on average, and evaluation model is sensitive to dangerous driving behavior.

Research on evolution hierarchy of major accidents in offshore oil and gas industry in storm disasters

ZHU Gaogeng, CHEN Guoming, ZHANG Yufei, SHENG Jiliang, YUAN Guanying, LIU Jian

2021, 31(7): 172-179. doi:10.16265/j.cnki.issn 1003-3033.2021.07.024

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In order to ensure safety of offshore oil and gas operations in extreme environments, a research method on evolution hierarchy of major accidents based on grounded theory and DEMATEL-ISM is proposed. Firstly, correlation between accidents and external environmental factors and internal factors was discussed through statistical analysis on accident cases. Then, programmed grounded theory was used to carry out objective induction from top to bottom for encoding and categorizing causal factors of accidents. Eventually, accident evolution hierarchy was determined considering subjective deduction characteristics of DEMATEL-ISM. The results show that potential risks for accidents include greater storm intensity, longer service life, lower platform category as well as season and area which see frequent storms. And interaction between B4 and B3 has characteristics of emergence. It also suggests that bad weather and lack of risk awareness are root causes of accidents, damage of supporting structure and loss of seal integrity are key nodes while damage of platform facilities is a necessary route. By intensifying management and control on above factors, risks of offshore oil and gas operations in extreme disasters can be effectively reduced.

Construction and application of maturity evaluation model of coal mine emergency rescue ability

CHENG Lianhua, ZHOU Ruixue, YAN Jin, GUO Huimin

2021, 31(7): 180-186. doi:10.16265/j.cnki.issn 1003-3033.2021.07.025

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In order to quantitatively evaluate emergency rescue capability of coal mines and clarify shortcomings of coal mines in the process of emergency rescue capability construction, a coal mine emergency rescue capability maturity evaluation model was proposed. Firstly, definition of coal mine emergency rescue capability was defined, and evaluation index system was constructed according to three stages: before, during and after the event. Secondly, maturity grade suitable for evaluation of coal mine emergency rescue capability was divided, and specific scoring standards were listed, and improved catastrophe progression method was introduced to calculate the total score of coal mine emergency rescue capability maturity. Finally, model was applied to quantitative evaluation of emergency rescue capability maturity level of a coal mine, and initial evaluation result was revised, emergency rescue capability maturity level of mine was obtained as an optimized level. The result shows that results obtained by model are consistent with actual conditions of coal mine, which verifies feasibility and effectiveness of model.

Study on causes of poisoning and asphyxiation in roadway opening by AHP-entropy weight method

WANG Gang, SHANG Luozhen, LIU Xuelin, TANG Li, CHENG Qian

2021, 31(7): 187-192. doi:10.16265/j.cnki.issn 1003-3033.2021.07.026

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In order to effectively prevent poisoning and asphyxiation accidents in roadway opening, AHP and entropy weight method for comprehensive analysis were used to construct an evaluation index system of such accidents. Then, objective weight of entropy weight method and subjective weight of AHP were coupled to form a combined weight. Finally, influencing factors of poisoning and asphyxiation accidents were analyzed and ranked before it is verified through an actual engineering case. The results show that the weight of not detecting concentration of harmful gas on time is the largest, which is 0.242 6, followed by improper location of alarm instrument and purchase of inferior protective equipment, which are 0.127 5 and 0.120 2 respectively. Among all man-made unsafe behaviors, failure to detect gas concentration on time makes a major cause of accidents. In terms of unsafe state, improper position of alarm instrument and purchase of inferior protective equipment have a greater impact, which is second only to failure to detect gas concentration on time.

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