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Table of Content

    28 April 2017, Volume 27 Issue 4
    Safety Social Science
    Research on establishment of similar safety management science
    LU Ning, WU Chao, JIA Nan
    2017, 27(4):  1-6.  doi:10.16265/j.cnki.issn1003-3033.2017.04.001
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    To seek a new breakthrough point for the research on safety management, the paper was aimed at establishing SSMS. To begin with, the feasibility of creating it was demonstrated, and it was defined with the connotation of definition and theoretical principle being analyzed together. Based on this, the necessity of dynamic similarity analysis was made clear by analyzing the object and content of the research, so a taper structure of similarity analysis was constructed on the basis of time and other six dimensions. Then the comparative method was ascertained as the basic research means of SSMS, and a methodology system of similar safety management and four stages research procedure were constructed. Finally, the application vistas of SSMS was prospected.The results show that SSMS is an important way to do safety management researching.
    On complexity of work safety problems in the light of Tianjin “8·12” accident
    XU Ming
    2017, 27(4):  7-12.  doi:10.16265/j.cnki.issn1003-3033.2017.04.002
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    In order to clarify the complexity of work safety problems, the complex features of Tianjin "8·12" accident were analyzed based on the theory of open complex giant system. The experts groups' experiences in disposing of accidents successfully using the metasynthesis method were reviewed. It shows that openness of each enterprise and each person has been magnified seriously by the urbanization, industrialization and comprehensive informationization, and now work safety problems are much more complicated than those in the past, that the network structure of the relationship is an another internal source of complexity of work safety problems, that work safety problems are an emergence of the systemic risks in the work safety supervision system and mechanism, and that the metasynthesis method should be used to work out a package of solutions for solving the work safety problems.
    Knowledge map analysis of visual safety management
    CHEN Xiaoci, TAN Zhanglu, MA Lin, SHAN Fei
    2017, 27(4):  13-18.  doi:10.16265/j.cnki.issn1003-3033.2017.04.003
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    For the sake of finding out the focus of and trend in the visual safety management research, the knowledge map of visual safety management was drawn with CiteSpaceV on the basis of published papers in CNKI since 1980. The result shows that the annual number of papers on visual safety management research has been growing, but the speed decreased receutly, and in 2014, the trend became minus, that most of the research groups are engaged in the energy and mineral related industries, several high-yield scientific research groups formed, but none of them are influential, and the cooperation between them is quite weak, that the attractive field of visual safety management research is unchanged, and that the research focus began to change from the safety technologies to the management theory, and the research on the basic management theory is also increasing.
    Safety Livelihood Science
    Research on foundation of similarity safety psychology
    KANG Liangguo, WU Chao, HUANG Rui
    2017, 27(4):  19-24.  doi:10.16265/j.cnki.issn1003-3033.2017.04.004
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    For the sake of establishing the system of similarity safety psychology to improve development of safety psychology, on the basis of the theories of similarity science, safety psychology and safety science, a definition of similarity safety psychology was put forward, its connotation was analyzed,and the research significance of similarity safety psychology was explained. The subject foundations of similarity safety psychology were analyzed, the concept system and research levels were constructed, the application field and example of similarity safety psychology were analyzed. Based on study objects scope, state and nature of similarity safety psychology, the dimension system of quantity, category and nature were put forward. The research approach of similarity safety psychology was described from different perspectives. Research shows that similarity safety psychology is direct cross fusion of safety psychology and similarity safety to form a new branch of safety science, the research aim is revealing the similarity phenomenon and principle of safety psychology.
    Research on safety attention concentration and attenuation based on system dynamics
    LI Naiwen, ZHAO Yunlong, NIU Lixia
    2017, 27(4):  25-30.  doi:10.16265/j.cnki.issn1003-3033.2017.04.005
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    To explore the mechanism of balance between high risk job employee safety accident probability and the man-machine work efficiency,the causal relationship between the factors influencing and the safety attention was analyzed.Based on SD principle,an influencing factors system model was built for safety attention employees in a high-risk work scenario. Coal miners were taken as the research object. A simulation was made by using Vensim software for exploring the changing process of safety attention concentration and that of safety attention attenuation and that of safety attention concentration-attenuation-concentration. The results show that the reasonable arrangement of employee's work and rest time is helpful in insuring the balance between employees safety accident probability and man-machine work efficiency and reducing the probability of safety accidents.
    Study on construction workers'attitude to safety and its affecting factors
    CHEN Xuefeng, CHEN Wentao
    2017, 27(4):  31-36.  doi:10.16265/j.cnki.issn1003-3033.2017.04.006
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    For the sake of studying the attitude of construction workers to safety and its influencing factors, a safety worker attitude model of construction workers was built. An instrument was developed for measuring construction workers'attitude to safety. The attitude of the construction workers was studied from the three dimensions of cognitive, emotional and behavioral tendencies. A survey on 100 construction workers was conducted by means of copies of a questionnaire. The instrument was validated by the survey, 34 factors of safety attitude, including gender, age, and work experience, were analyzed. 15 main influencing factors were identified, such as working years, salary and welfare. A model was built for factors influencing construction workers'attitude to safety. The results show that the main factors influencing construction workers' attitude to safety are working years, salary welfare and other 15 and that for individuals, the factor having the greatest influence on the attitude is the management comprehensive influence factors.
    Experimental research on legibility of LED traffic signs
    HUANG Xiaofang, JIA Zhixuan, ZHUO Yajuan
    2017, 27(4):  37-42.  doi:10.16265/j.cnki.issn1003-3033.2017.04.007
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    In order to help drivers win more operating time and improve traffic safety , the legibility of traffic signs was researched. LED active luminous guide signs designed to be trialed on the middle ring road of Taiyuan city and reflective film signs of the same specification were taken as research objects. Legibility researches were made both on LED active luminous traffic signs and reflective film signs under different experiment conditions of the day and night. The results show that the legibility of traffic signs which recognized by drivers is related to their environment and condition,and that there is a little difference between the legibility of LED active luminous traffic signs in day and that at night , but it is much better than the legibility of reflective film signs at night, the former is greater than the latter by 1.3-1.9 times.
    Impact of adaptive cruise control system on driving safety
    LIU Xinyu, WU Xueqin, WANG Chang, ZHANG Ruibin, SONG Zhu
    2017, 27(4):  43-48.  doi:10.16265/j.cnki.issn1003-3033.2017.04.008
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    To explore ACC's impact on driving safety, actual road driving tests were carried out, Chinese typical road scenes were acquired, then these scenes were rebuilt in a driving simulator. Driving tests were made on a driving simulator under with/without ACC conditions, so as to contrastively analyze ACC's performance, and detect drivers' emergency reaction, by analyzing TTC of drivers belonging different characteristic groups. The results show that ACC can handle most types of road situations, that when faced with dangerous situations that ACC can't handle, all kinds of drivers' emergency reaction with ACC driving is slower than that in manual driving, that female, old drivers or drivers with little ACC knowledge are more vulnerable to ACC's adverse impact, and that safety of ACC driving is dependent on driver's ACC knowledge.
    Safety Systematology
    Unsafe factor recognition and interactive analysis based on deep learning
    TONG Ruipeng, CUI Pengcheng
    2017, 27(4):  49-54.  doi:10.16265/j.cnki.issn1003-3033.2017.04.009
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    In order to solve the problem of unsafe factor identification and interactive analysis in the field of behavior based safety, an unsafe factor identification and interaction analysis model based on deep learning was built after building an unsafe factor identification layer from the "human-machine-environment" aspects, which use different deep learning structures to identify the behavior attributes of workers,unsafe factors in work environment scenarios and equipment operating states. Then, through the interaction layer of factors, the correlation and regression multi-value algorithm were used to analyze the unsafe factors. Finally, representation of the analysis results was achieved by the outputting display layer. An interactive analysis was carried out for unsafe factors in a certain coal mine's three types of production activities, fully mechanized coal mining, tunneling and ventilation, by using the optimal deep learning structures selected by Matlab platform,on the basis of the video and audio data provided by the coal mine. The results show that the model can be used to identify and analyze the unsafe factors, such as operation at coal mining surface without support, and feeding materials into a shotcrete machine going wrong, describe unsafe behavior, and classify the risks and the behavior traces.
    Safety Social Engineering Work
    Study on redefinition of hazard and its relationship with latent danger
    MENG Xianfei, DING Enjie, LIU Quanlong, LI Xinchun
    2017, 27(4):  55-59.  doi:10.16265/j.cnki.issn1003-3033.2017.04.010
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    In order to improve the operability of hazard's definition and classification, and to clarify the relationship between the hazard and the hidden danger, the hazard was redefined and classified further based on the existing definition and classification of hazard and then the relationship between hazards and latent danger was explored in detail. The result shows that the hazard should be redefined as the root or state, which could cause harm or loss and are sources of risk,that the hazards should be categorized into root hazards and state hazards,that the root hazards are the root cause of accidents, which are objective and inherent regardless of being identified or not, including tangible and intangible entities including people, things, organizations, and systems,that the state hazards are root danger's unsafe conditons which trigger accidents directly or indireactly, including being in unsafe state and not being in unsafe state,and that the latent danger is the root hazard being in unsafe state.
    Feasibility study of using rock powder to prevent spontaneous combustion of residual coal
    ZHANG Chun, LI Jiming
    2017, 27(4):  60-65.  doi:10.16265/j.cnki.issn1003-3033.2017.04.011
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    In order to ascertain the feasibility of using rock powder to prevent spontaneous combustion of residual coal, the methods of theoretical analysis and experimentation were used to study the spontaneous combustion process of residual coal mixed with rock powder. First, according to theoretical analysis, the rock powder mixed with the residual coal will prevent spontaneous combustion of the residual coal. The experiment included three groups. The heating processes of coal samples were observed. The experimental results show that both the quantity and the particle size of the rock powder have a great influence on the spontaneous combustion process of the residual coal,that rock powder can prevent spontaneous combustion of residual coal when its quantity is greater than the criticality quantity, that spontaneous combustion of residual coal will not occur when the mixing ratio of rock powder to coal is 1∶1 and above,that when the particle size of rock powder is larger than the criticality particle size and near to the peak particle size, the efficiency with which the rock powder prevents spontaneous combustion of the residual coal is the greatest,and that it is feasible theoretically that using rock powder to prevent spontaneous combustion of the residual coal when the quantity and the particle size are determined reasonably.
    Comparative study on community fire safety in China and America
    YI Cannan, SHI Shiliang, HU Hong, ZHANG Zuozhao, LIU Meiying, CHEN Chengfeng
    2017, 27(4):  66-71.  doi:10.16265/j.cnki.issn1003-3033.2017.04.012
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    For the sake of improving fire safety of communities in China, the paper was aimed at making a community fire safety management comparison between China and America based on the comparison theory. Combining with system engineering principles, factors affecting fire safety of community were obtained and dimensions to be considered in the comparison were identified based on the methodologies of the comparative safety science. Similarities and differences between the two countries in fire supervision, fire standards, fire powers and fire safety management for community fire work were summarized. Comparison results show that there are significant differences between the two in safety management, standard-formulating, firefighter-training, education model among others, and that America's experience may be used for reference in community fire safety management in China.
    Explosion characteristics of coal dust in a tube and suppressing techniques
    LI Xiaodong, SHI Zheng
    2017, 27(4):  72-76.  doi:10.16265/j.cnki.issn1003-3033.2017.04.013
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    To understand and prevent the explosion accidents of coal dust, experiments were carried out by using a large-scale horizontal combustion tube. Influences of both particle size and volatile content of coal dust on the explosion overpressure were investigate. ABC powder, CaCO3 rock dust powder and SiO2 powder were taken as the suppressing agents. The effects of kind, concentration and particle size of suppressing agents on explosion suppression were studied. The experimental results show that the influences of coal dust particle size and volatile content on explosion overpressure gradually diminish with the increasing of coal dust concentration,that for coal dust explosion suppression, the effect order is ABC powder, SiO2 and CaCO3 powder,that for ABC powder, the smaller the average particle sizes are, the better the suppressing effects will be,and that only when the concentrations of suppressing agents are enough high, and more than 920 g/m3, can complete explosion suppression be achieved, otherwise, the explosion wave would newly develop through the explosion suppression zone.
    Experimental study on explosive characteristics of grain dust in beer enterprise
    WANG Yujiao, ZHAO Jiangping
    2017, 27(4):  77-81.  doi:10.16265/j.cnki.issn1003-3033.2017.04.014
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    In order to learn explosion characteristics of the grain dust collected from the dust removal system for bolting procedure in beer enterprise in China,experiments were carried out by means of an 1.2 L Hartman dust explosion test facility. Influences of particle size, mass concentration, moisture content and on the explosion pressure (P) and the rate of pressure rise (dP/dt) were studied.The results show that grain dust LEL is between 125-166.67 g/m3, that the Pmax is 1.81 MPa and (dP/dt)max is 10 MPa/s when the concentration is 291.67 g/m3,that the change in P and dP/dt are similar, that the increase of the particle size from 98-105 μm to 180-1 250 μm makes the LEL increase from 50-58.33 g/m3 to 141.67-150 g/m3 and the explosion pressure drop from 0.9 MPa to 0.72 MPa,and that the decrease of moisture content from 6.39% to 0% (absolute dry condition) makes explosion pressure increase from 1.3 MPa to 2.1 MPa.
    Research on distribution of open leakage magnetic field at ferromagnetic component surface defect
    DAI Guang, AN Ran, YANG Zhijun, LIU Yanlei, YU Yongliang
    2017, 27(4):  82-86.  doi:10.16265/j.cnki.issn1003-3033.2017.04.015
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    In order to detect a surface defect in a metallic component, according to the phenomenon of the open magnetic field generated by a permanent magnet on the surface of the component, the finite element method was used to establish a magnetic field model for the surface defect, and the spatial distribution characteristics of the leakage magnetic field were obtained. By changing the depth, width and air gap height, the influences of surface defect parameters on the open magnetic field were studied, and the variation in the magnetic flux density components and that in the amplitudes were analyzed. Tests of artificial surface defects were carried out under laboratory conditions. The results show that the magnetic flux density is higher at the defect location, the magnetic flux density increases with the increasing of both the depth and the width of the defect, and the greater the height of the air gap is, the lower the magnetic flux densitywill be. The experimental results are consistent with the results of the finite element researches and analysis.
    Fuzzy reasoning method for path of fault propagation in vertical ship lift hydraulic system
    CHEN Shu, WANG Yue, WANG Jianping, SHEN Haobo, LI Zhi
    2017, 27(4):  87-91.  doi:10.16265/j.cnki.issn1003-3033.2017.04.016
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    Taking into account the correlations and chain-interloacking actions between the structures in an existing vertical ship lift hydraulic system, an FPN model was built for fault propagation to effectively reduce system malfunction in the vertical ship lift. Firstly, the process was preseated abstrictly with the applying of basic variables in FPN, failure propagation in the hydraulic system on the basis of the basic principle of FPN. The fault modes of the hydraulic system were analyzed. An FPN was stablished after clarifying the logical relationship between the fault locations. finally, the fault propagation path was deduced fuzzily using the transition rule. The Three Gorges ship lift was analyzed by using the method. The results indicate that the most likely propagation path to bring in the failure of vertical lift ship hydraulic system is the damage to the control valve,the failure of hoist, the failure of pressure keeping,failure of pressure keeping, may further bring failure of hydraulic hoist of ship carriage, and the whole system may stop working.
    Application of quantitatively improved HAZOP method in ventilation safety during gas tunnel construction
    LIU Hui, ZHANG Zhichao
    2017, 27(4):  92-97.  doi:10.16265/j.cnki.issn1003-3033.2017.04.017
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    In order to strengthen the ventilation effect for construction ventilation system of gas tunnel, the quantitatively improved HAZOP was used in studying ventilation system of gas tunnel construction. The existing deviations were analyzed quantitatively by introducing the deviation. Models were built for calculating single parameter deviation degree, node deviation degree and deviation degree of different ventila stages of every work area, the deviations were divided into four levels of I, II, III and IV. The fourth stage of a certain gas tunnel construction ventilation was taken as the analysis object, which was divided in to five nodes, and the face node was taken as an example of the HAZOP analysis, 5 node deviation degrees were obtained respectively by calculation, then deviation degree and deviation level of this stage were obtained. The results show that the deviation level of this stage is Ⅱ, belonging to moderate deviation,and needing to take safety measures according to the current situation,and that the analysis result conforms with the actual situation in the work area.
    Study on propagation of hydraulic fracture in combined hard roof
    WANG Haiyang, YU Bin, XIA Binwei, GONG Tao, ZHANG Rui
    2017, 27(4):  98-103.  doi:10.16265/j.cnki.issn1003-3033.2017.04.018
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    To study the propagation process of hydraulic fracture in compound hard roof, a propagation model was built and the propagation mechanism and mode were analyzed theoretically. A compound hard roof in Datong Mining Area was taken as the research object. Then the propagation process and influencing factors of hydraulic fracture were studied by coupling system of flow and solid in the rock failure process analysis (RFPA2D-Flow). The numerical simulation results were verified by a similar model test. The results show that the fracture propagation process is mainly influenced by rock mechanical properties, principal stress difference, angle and mechanical properties of bedding plane. Among others, that the fracture propagates preferentially into the marl layer with the weakest strength, that an increase in the principal stress difference weakens the differences in the processes of fracture propagating to different rock layers,that with the increase of bedding plane angle, the fracture propagation mode changes gradually from crossing the bedding plane to extending along it and be confined in the fractured layer,and that an increase in the bedding plane elastic modulus promotes is helpful for the fracture to propagate into the coarse sandstone.
    Experimental research on adsorption-desorption characteristics of methane in outburst coal by using nuclear magnetic resonance spectrums
    TANG Jupeng, TIAN Hu'nan, MA Yuan
    2017, 27(4):  104-109.  doi:10.16265/j.cnki.issn1003-3033.2017.04.019
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    With the development of deep mining, coal and methane outbursts have become a major hidden danger, and experimental research on the micro-mechanisms of methane storage and transportation is very important. In order to simulate the storage and transportation processes of methane in coal,the nuclear magnetic resonance T2 spectrum technique was applied for the adsorption-desorption experimental research of high methane and outburst coal from Sunjiawan Mine in Fuxin basin. Results indicated that the T2 spectrum boundaries of adsorbed methane and porous medium-confined methane and bulk methane could be defined with cut-off time of transversal relaxation time, that the relation between methane pressure and shale-adsorbed methane can be described with a Langmuir equation, that there is a linear relation between methane pressure and porous medium-confined methane, that the desorption processe of adsorbed methane lagged behind adsorption, and the hysteresis critical pressure is 5.5 MPa,and that the hysteresis of porous medium-confined methane is not obvious.
    Real-time traffic safety evaluation method for freeway in fog
    ZHANG Cunbao, PENG Hanhui, ZHANG Shan, LYU Changping
    2017, 27(4):  110-115.  doi:10.16265/j.cnki.issn1003-3033.2017.04.020
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    To evaluate the real-time safety status of a freeway in fog, the VISSIM software was used to simulate freeway traffic flows in various foggy environments, based on the actual traffic data, and the relationships between visibility, traffic flow parameters and real-time traffic safety were analyzed. The number of traffic conflicts was selected as indicator of freeway real-time safety status, and the main factors influencing real-time traffic safety status were identified using the random forest method, then a calculation model was built for real-time traffic conflicts by regression analysis. The model was tested and verified by using the traffic and meteorology data for I-43 freeway in USA. The results show that the traffic conflicts calculated by the model are consistent with the occurrence of traffic accidents, which can accurately reflect traffic safety status before and after the accidents under a foggy weather condition.
    Distribution of shear strength parameters and safety influence of unsaturated tailings
    LIN Xuesong, CHEN Dianqiang, WANG Laigui
    2017, 27(4):  116-121.  doi:10.16265/j.cnki.issn1003-3033.2017.04.021
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    To study influence of unsaturated tailings on safety of tailing ponds, two-dimensional unsaturated seepage experiments and direct shear tests were carried out. Spatial distributions of cohesive force and internal friction angle of unsaturated tailings were studied. The method of parameters optimization was used to calculate the unknown parameters of the analytic model and the whole model was used to analyze the results of the unsaturated seepage experiments. The influence of unsaturated tailings on the dam safety factor was analyzed by numerical computation. The results show that distribution of water content of unsaturated tailings is like an exponential function in both horizontal and vertical directions,that the cohesive force increases at first with water content and then decreases, there is a negative correlation between internal friction angle and water content, and spatial distribution characteristics are owned by shear strength parameters,and that there is a negative correlation between the dam safety factor and thickness of the unsaturated tailings layer.
    Model experiment research on flow characteristcs and regularity of tailing flow due to tailings dam-break
    WEI Yong, XU Kaili, XIONG Lin, LI Meng
    2017, 27(4):  122-126.  doi:10.16265/j.cnki.issn1003-3033.2017.04.022
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    In order to improve the ability of disaster prevention and reduction in tailings reservoir downstraeam, taking Beijing Heshangyu tailing reservoir as an example, physical model experiments were carried out to explore effects of dam-break flow's volume fractions, collapse forms and downstream slopes on flow charateristics and regularity of tailing dam-break flow . The experimental results show that with increasing of tailing flow volume fraction, the time that tailing dam-break flow reaches accumulation depth peak is longer and accumulation depth peak is greater. With increasing of collapse gate, the time that tailing dam-break flow reaches accumulation depth peak is shorter and accumulation depth peak is greater. The larger collapse gate of tailing dam-break is, the more widely tailing flow moves in the downstream and the greater coverage area of tailing flow is.With increasing of downstream slope, the time that tailing dam-break flow reaches accumulation depth peak is shorter and accumulation depth peak is smaller. Downstream slope has only a fairly weak effect on the movement process and coverage area of tailing dam-break flow.
    DMIP-MCDM based method of evaluating safety input for coal enterprises
    ZHANG Chao, ZHAO Baofu, JIA Baoshan, ZHAI Cuixia, REN Haizhi, GUO Jianwei
    2017, 27(4):  127-132.  doi:10.16265/j.cnki.issn1003-3033.2017.04.023
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    In order to help coal mining enterprises improve the safety level of production logistics systems,the paper was aimed at developing a DMIP-MCDM based method for evaluating safety resource allocation of production logistics systems. Firstly,a number of INFNs dynamic aggregate decision matrices were combined, then the weights of the initial evaluation and the weights of the equilibrium degree were calculated.Secondly,the INFNs generalized hybrid variable weighted Bonferroni(INFNGHVWB) operator was used to calculate the weights relating to the accuracy evaluation. Thirdly, DMIP evaluation weights and the overall evaluation weights of the safety resource allocation were calculated. The DMIP-MCDM based method was used to analyze the production logistics system of a certain coal mining enterprise. The results show that there are many kinds of safety resource allocation and they influence each other and that the DMIP-MCDM can be used to realize the multi-dimensional and dynamic systematic evaluation of safety resource allocation condition,and helps to optimize the allocation of safety resources.
    Particle discrete element method based analysis of stability of roadway surrounding joint rock mass
    LI Chuanming, LIU Wanrong
    2017, 27(4):  133-138.  doi:10.16265/j.cnki.issn1003-3033.2017.04.024
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    Joint rock mass has discontinuity and large deformation characteristics.For the sake of studing the stability of a given roadway surrounding joint rock mass,a model was built for the roadway in a joint rock mass by using the particle discrete element method.The effect of connection rate of joint on deformation and failure of the rock mass was studied. The displacement of surrounding rock as well as the distribution of micro cracks were analyzed. The results show that the deformation of the rock mass under an external load is a function of the connection rate of joints,so when the rate is zero the deformation is small, when the rate reaches 50% local falling occurs, when the rate is 70%,rock of roadway tends to form failure surfaces, gives birth to blocks falling,and deforms seriously, and that with the increase of joint connectivity rate, surrounding rock micro cracks increase sharply, main cracks in surrounding rock are shear cracks,the most possible way of failure for the joint rock of roadway is shear failure.
    Analysis of elastic potential energy of coal in outburst process and its sensitivity to influencing factors
    DAI Linchao, WEN Guangcai, SUN Haitao, CAO Jie
    2017, 27(4):  139-144.  doi:10.16265/j.cnki.issn1003-3033.2017.04.025
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    In order to study the generation mechanism and evolution of coal elastic potential energy in the process of coal and gas outburst, a coal elastic potential energy computing model was established, and orthogonal experimental design method was used for the quantitative analysis of the sensitivity to influencing factors.On the basis of the actual situation of the heading face Ji15-24080 of No.10 coal mine in Pingdingshan, the relationship between excavation footage and coal elastic potential energy was discussed. The results show that the elastic potential energy is more sensitive to concentration coefficient of the abutment stress, the elastic modulus of coal and original effective stress, while it is less sensitive to the coal internal friction angle and Poisson's ratio,and that the coal elastic potential energy increases first and then decreases with the increasing of the excavation footage for the Ji15-24080 working face, and when the excavation footage reaches 4.5 m, the coal elastic potential energy comes up the maximum value.
    Research on instability mechanism of coal and rock "shock bump-rock burst" dynamic system
    LYU Pengfei, CHEN Xuehua
    2017, 27(4):  145-150.  doi:10.16265/j.cnki.issn1003-3033.2017.04.026
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    For effective provention and mitigation of rock burst induced by shock bump, a model was built for the coal and rock "shock bump-rock burst" dynamic system based on the relationship between rock burst and shock bump. The mechanism of rock burst induced by shock bump and its instability criterion were analyzed on the basis of the model. The dynamic effects caused by thigh energy shock bumps near the working face were certified by numerical simulation. Corresponding control measures of rock burst induced by shock bumps were provided. The results show that the rock burst mechanism induced by shock bumps is that disturbance created by shock bump makes coal and rock stress reach the plastic softening stage instantaneously, the difference bigger between the accumulation energy of coal and rock and the consumption energy due to destruction, and a strong rock burst occurrs when the rigidity condition is satisfied. and that the danger of rock burst induced by shock bumps can be avoided or reduced greatlyby controlling separately shock bump sources, shock bump energy propagation path and rock burst sources.
    Safety Hygiene Engineering and Technology
    Study on influence of self-discharging truck speed on dust spreading in open-pit
    CHEN Xi, GE Shaocheng, DENG Cunbao, ZHANG Xinghua, WANG Shiyao
    2017, 27(4):  151-156.  doi:10.16265/j.cnki.issn1003-3033.2017.04.027
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    In order to describe the dynamics three-dimensional flow field of dust raised by a mining truck in an open-pit mine, the distribution of airflow fields and that of dust fields were simulated for different speeds of the truck by the dynamic mesh method and the discrete phase particle tracking technology, and real measurement was made in No.2 coal mine in Shenglidong mining area. The result shows that the dust resource comes from the dust bunny on the road, and both the shear airflow and the induced airflow caused by turbulence diffusion are the reason of dust particles spreading, that as time goes on, many dust particles diffuse behind the self-dumping truck before sedimentation, and the dust concentration is 418-956 mg/m3, that there is a positive correlation between both the dust concentration and the height colud of dust and the truck speed, that the dust concentration in No.2 coal mine in Shenglidong mining area is 1 932.2 mg/m3, and that the relative error between measured values and simulation values for each testing section is less than 6.64%.
    Safety Social Engineering Work
    Study on safety performance of first line operators in industrial enterprise based on resilience engineering concept
    SI Hu, YANG Zili, XUE Yongzhi, ZHAI Chenglin
    2017, 27(4):  157-162.  doi:10.16265/j.cnki.issn1003-3033.2017.04.028
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    For improving the safety performance of the first line operators, 7 resilience dimensions related to work safety in enterprise, including basic resilience factors and behavioral resilience factors, were identified based on the resilience engineering concept,and a model was built for influences of the resilience dimensions on the performance. According to the investigation results from a state owned chemical industrial enterprise, a multiple mediation SEM based approach and a product distribution algorithm were applied to analyze the effective paths,along which the dimensions affect the performance. Study shows that the behavioral resilience factors of employee have a direct impact on safety performance,that the four basic resilience factors have different degrees of positive indirect influence on operators'safety performance, mediated by diversities influence mechanisms of behavioral resilience factors of employee,and that monitoring and preparedness are the most influencial dimension in the basic resilience factors and the behavioral resilience factors respectively.
    Public Safety
    Research on case similarity matching of city bus fire incidents
    SONG Yinhua, YU Kan, LYU Wei, LIU Dan
    2017, 27(4):  163-168.  doi:10.16265/j.cnki.issn1003-3033.2017.04.029
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    In order to solve the problem of rapid disposal and prevention of bus fire incidents a case database of 110 cases of bus fire incidents was established and relative recommendations were proposed after analyzing similar cases. Based on the information weight method and the text similarity calculation method, a case similarity matching model was built by which case stories similar to the target cases can be found. The matching results show that the retrieved historical cases and target cases are similar in the basic information, so they can be studied as similar cases. Similarities and differences between three cases of malicious fire incidents were analyzed. It was found that essential measures to prevent and despose malicious five incidents in bus should be making jiont rapid rescne arrangements,ensuring normal security,improving car evacuation instruction means, and regular supervision of both car body condition and fire tools configuration.
    Comparative analysis of social vulnerability of seismic areas: a case study of Lushan earthquake and Ludian earthquake
    MIAO Cheng, DING Mingtao
    2017, 27(4):  169-174.  doi:10.16265/j.cnki.issn1003-3033.2017.04.030
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    In order to reveal the effect of regional social vulnerability on the losses caused by the earthquakes, Lushan earthquake stricken area and Ludian earthquake stricken area were selected as the study object. Based on the statistical data and field investigations, an evaluation indicator system of social vulnerability was established. Using the entropy value method, the social vulnerability of Lushan earthquake stricken area and that of Ludian earthquake stricken area were comprehensively evaluated. The results showed that the social vulnerability of Ludian earthquake-stricken area was greater than that of Lushan earthquake-stricken area, and that one of the reasons why the small magnitude of Ludian earthquake causedHeavier casualties was the greater regional social vulnerability.