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Statistical analysis of major chemical work safety accidents in recent 20 years LI Min, ZHU Baijian, CHEN Tingwei, HE Shan, SHI Shiliang, LU Yi China Safety Science Journal    2024, 34 (11): 43-50.   DOI: 10.16265/j.cnki.issn1003-3033.2024.11.0437 Abstract （2058）   HTML （39）    PDF（pc） （9483KB）（343）       Knowledge map    Save In order to reduce the number of accidents, casualties and enhance the ability to control the level of accident hazards, and to study the general characteristics and hidden patterns of heavy and large safety accidents in China's chemical production industry, this paper used statistical analysis to comprehensively analyze 41 heavy and large accidents that occurred from 2000 to 2023 in terms of time, region, production stage, type of accidents, causes of accidents and other elements. The results show that the number of accidents shows a fluctuating upward trend in 2007-2019, and July and August are the high incidence period of accident every year. The number of heavy chemical accidents in East China accounts for 52.2% of the whole country, of which 12 accidents occurred in Shandong Province, accounting for 57.1% of the total. The highest proportion of accidents occurred in the formal production stage of enterprises, accounting for 53.6% of the total. The main types of accidents is container explosion. The domino effect exists in accidents, with heavy domino accidents and large domino accidents accounting for 14.63% and 39.02% of the total accidents respectively. There are more accidents with domino effect in heavy and large accidents than those without domino effect, accounting for 53.65%, of which the casualties of accidents with large dominoes account for 40.1% of the total accidents and casualties. The most frequent cause of accident statistics is the illegal execution of production, accounting for 49.3% of the total, and the resulting accidents with domino effect account for 66.6% of the accidents. In response to the problems analyzed in the above accidents, this paper proposes some measures to improve the management system from three perspectives: the company, the equipment and the employees. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Connotation and capacity building of safe development of new quality productivity LUO Fanglu, LUO Wuzan China Safety Science Journal    2024, 34 (10): 8-16.   DOI: 10.16265/j.cnki.issn1003-3033.2024.10.0616 Abstract （1184）   HTML （7）    PDF（pc） （1872KB）（103）       Knowledge map    Save From the perspective of overall high-quality development and high-level security strategy, in order to realize the integration of new quality and productivity security development, research was carried out on the connotation, basic characteristics and capabilities of new quality and productivity security development. First, based on the triangle model, the connotation of safe development of new quality productivity was explained in combination with specific cases. Secondly, using the method of system engineering, the three-dimensional structural model was constructed, and the essential characteristics of the safe development of new quality productivity were analyzed. Finally, the capacities required for enhancing the safe development of new quality productivity were proposed. The research results indicate that the safe development of new quality productivity should focus on science and technology security, information data security, and risk management in new security fields, which are characterized by basic, overall, dynamic, complex and extensive features. The basic is reflected in the time dimension, the overall, dynamic and complex are manifested in the logic dimension, and the extensive features are embodied in the knowledge dimension. To promote safe development of new quality productivity, it is necessary to enhance strategic ability, leadership ability, collaboration ability, risk management ability, and theoretical innovation ability, corresponding to the three-dimensional structure model. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Research on disaster and accident trans-regional collaborative governance community based on fsQCA SHEN Xia China Safety Science Journal    2024, 34 (10): 205-213.   DOI: 10.16265/j.cnki.issn1003-3033.2024.10.0525 Abstract （1006）   HTML （1）    PDF（pc） （1573KB）（12）       Knowledge map    Save In order to facilitate the rapid formation of a disaster and accident trans-regional collaborative governance community in response to major emergencies, this study employed fsQCA. It investigated fourteen cases by selecting seven conditional variables across three dimensions: Incentives, mechanisms, and guarantees. These variables included value consensus, existential threats, administrative mobilization, collaborative linkage mechanisms, interest equilibrium mechanisms, legal guarantees, and digital intelligence technologies. The study explored the core influencing factors and the complex causal relationships in the formation of the disaster and accident trans-regional collaborative governance community. Configurational analysis identified three patterns of community formation: party-government-led, value-driven, and crisis-triggered, with each pattern corresponding to typical cases in the case database. The findings reveal that collaborative linkage mechanisms are a necessary condition for the formation of emergency management communities, while the other six variables cannot individually serve as necessary conditions. Optimizing the functionality of collaborative linkage mechanisms can effectively promote the development of trans-regional emergency management communities. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Statistical analysis of major coal mine fire accidents in China LI Min, LIN Zhijun, WANG Deming, SHI Shiliang, LU Yi China Safety Science Journal    2023, 33 (1): 115-121.   DOI: 10.16265/j.cnki.issn1003-3033.2023.01.0457 Abstract （985）   HTML （30）    PDF（pc） （9626KB）（239）       Knowledge map    Save To study the general characteristics and cause of major coal mine fire accidents in China, 360 major accidents from 2000 to 2021 were comprehensively discussed using the statistical analysis method from the dimensions of time, region, location, coal mine ownership, ignition source and external causes. The results show that the fourth quarter is the peak period for major fire accidents. The number of major fire accidents and deaths in Guizhou, Shanxi and Heilongjiang Provinces account for 45.28% and 47.11% respectively. The probability of catastrophic fire accidents in the chamber is the highest, accounting for 52.38% of major accidents in the chamber. Major fire accidents in the coalface show an increasing trend from 2011 to 2021. The major coal mine fire accidents in township coal mines account for more than 60% of the total number of accidents and deaths, but show a gradient descent trend year-on-year and keep basically stable. The proportion of major accidents caused by illegal open flame, self-heating fire and friction impact gradually increases, while the proportion of major accidents caused by electric spark ignition and blasting ignition gradually decreases. Poor management is the main cause of major coal mine fire accidents. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Unsafe-condition definition and control based on risk ZHAO Dongfeng, LIU Shangzhi, WANG Haoshui, CHEN Yifeng, ZHOU Chao, JIU Jiangbo China Safety Science Journal    2023, 33 (2): 1-8.   DOI: 10.16265/j.cnki.issn1003-3033.2023.02.2607 Abstract （841）   HTML （42）    PDF（pc） （6118KB）（560）       Knowledge map    Save In order to strengthen the understanding of unsafe-condition, clarify the relationship between unsafe-condition and risk, and better promote the construction of dual prevention mechanisms for enterprises, based on the summary of the existing definitions of unsafe-condition, the definition and exact English expression of unsafe-condition were proposed from the perspective of risk. Through deep analysis of the relationship between unsafe-condition and risk management and control, the significance of redefining unsafe-condition based on risk was illustrated. Combining the problems in the investigation and management of unsafe-condition and the essence of the construction of dual prevention mechanisms, the idea of dynamic management and control of unsafe-condition based on risk was put forward, including taking risk hierarchical management and control as the premise and foundation, carrying out unsafe-condition hierarchical management based on risk evaluation, and finally realizing dynamic monitoring and hierarchical management and control of unsafe-condition by using information technology. The results show that unsafe-condition is an unidentified risk, or an unsafe state where the risk has not been effectively controlled and exceeds the acceptable level of people's risk. Its English expression is unsafe-condition. The investigation and management of unsafe-condition should be carried out based on the idea of risk classification management and control, timely discovering unsafe-condition through the state of uncontrolled risks, and treating unsafe-condition based on the idea of risk management and control, the essence of which is to control risks. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Typical fire protection case of lithium iron phosphate battery energy storage system LI Lingkun, CHEN Huanjun, LIU Hui, ZHANG Yukui, LI Yao, CHEN Yanqiao China Safety Science Journal    2022, 32 (S2): 111-117.   DOI: 10.16265/j.cnki.issn1003-3033.2022.S2.0126 Abstract （798）   HTML （21）    PDF（pc） （1748KB）（501）       Knowledge map    Save In order to solve the fire safety issue of energy storage system caused by thermal runaway of lithium iron phosphate battery, the fire extinguishing mechanism and performance characteristics of several common extinguishants were studied, and a more effective fire extinguishing method was explored and practiced. Firstly, the thermal runaway process and combustion characteristics of lithium iron phosphate battery were summarized. Then, the fire extinguishing mechanisms of extinguishants such as heptafluoropropane, gas-liquid composite extinguishant, perfluorohexone, aerosol and water mist, as well as the effects of fire extinguishing and reignition suppression on the fire accidents of lithium iron phosphate battery were analyzed. Finally, based on the typical fire fighting system case of prefabricated cabin type lithium iron phosphate battery energy storage system in actual work, the system composition and control logic were introduced. The results show that the fire of lithium iron phosphate battery is a comprehensive fire of category A, B and C. Heptafluoropropane, gas-liquid composite extinguishant, perfluorohexanone, aerosol and water mist have their own advantages and disadvantages in terms of fire extinguishing effect including cooling effect, inhibition of reignition and technological maturity, but none of them can simultaneously extinguish open fire and inhibit battery reignition. It is more effective to use the fire extinguishing method of combining perfluorohexone and water. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Exploration and challenge research on personnel training for emergency technology and management specialty model in China QIAN Hongwei, WANG Mingyue, GUO Jing, YIN Xiangju China Safety Science Journal    2022, 32 (11): 9-13.   DOI: 10.16265/j.cnki.issn1003-3033.2022.11.0121 Abstract （768）   HTML （10）    PDF（pc） （1480KB）（1034）       Knowledge map    Save In order to improve the quality of personnel training in emergency technology and management in higher education institutions and to solve the problem of the shortage of professional emergency personnel, the "integrated and streamed education" personnel training mode was proposed in six aspects:enrollment, training and employment, curriculum system, experimental training bases, teaching and research, matching teaching materials and teachers' teams based on the real demand, national policies and discipline laws, and on the basis of tracing the relevant professional literature. The future development of emergency technology and management was prospected from four aspects:breakthrough of specialty construction, basic theory research of specialty, dual track of specialty learning, and frontier topics of emergency science strategy. The results show that the emergency technology and management professions in China are emerging professions, and there are many challenges in cultivating talents. By leveraging the integration channel, considering a professional platform, and setting up two professional teaching directions, it is helpful to integrate the faculty, improve the training mode of professional talents, and broaden the practical needs of the profession. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Overview of recognition methods of pedestrian abnormal behaviors in public places ZHAO Rongyong, WEI Bingyu, ZHU Wenjie, ZHENG Chengyuan, LI Haonan China Safety Science Journal    2024, 34 (2): 83-93.   DOI: 10.16265/j.cnki.issn1003-3033.2024.02.1125 Abstract （735）   HTML （20）    PDF（pc） （6468KB）（376）       Knowledge map    Save The purpose of this research is to clarify the research progress of the theory and technology of pedestrian abnormal behavior recognition in public places. Firstly, with the help of China National Knowledge Infrastructure (CNKI) and the Web of Science (WOS), a broad definition and universal characteristics of abnormal pedestrian behavior in public places were given. The existing research results related to abnormal behaviors were divided into three categories: harmful behaviors, dissociable behaviors and violations. Then, from the perspective of data and technological foundations, the existing abnormal behavior recognition methods were divided into four categories: artificial design, human skeleton, Red Geen Blue(RGB) images and wearable sensors. Secondly, this study sorted out the abnormal behavior datasets of mainstream populations both domestically and internationally, and analyzed the performance of relevant algorithms on the datasets. Finally, the limitations of existing research methods in available datasets and data fusion detection were summarized, and future research directions and optimization suggestions were provided. The results indicate that these four types of abnormal behavior recognition methods have their own advantages and disadvantages. It is necessary to construct a diversified, well-defined and high-quality international benchmark dataset of abnormal behaviors among the crowd. Future research should focus on robust and accurate methods, models, and algorithms for identifying abnormal behaviors, explore multi-dimensional data fusion complementary detection methods, improve the application scenario consistency and adaptability of the theoretical results of abnormal behavior recognition, and eventually enhance the level of public place crowd safety governance. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Risk assessment of low-altitude unmanned aerial vehicle operation based on fuzzy Bayesian network GENG Zengxian, CHEN Junyu China Safety Science Journal    2024, 34 (8): 53-60.   DOI: 10.16265/j.cnki.issn1003-3033.2024.08.1295 Abstract （731）   HTML （17）    PDF（pc） （6229KB）（145）       Knowledge map    Save To solve the current safety risk issues of UAV operations in low-altitude urban environments, a FBN was used to identify and analyze the key risk factors of low-altitude UAV operations. Firstly, risk factors were analyzed from the perspective of human-machine-environment-management based on operation process of low-altitude UAVs. GeNIe software was used to develop a Bayesian network(BN) for risk assessment of low-altitude UAV operations, and the prior probabilities of the underlying events were analyzed using expert prior knowledge and fuzzy sets. Finally, univariate, bivariate, and sensitivity analyses were performed, and the network feasibility was validated. The results indicated that the key risk factors for low-altitude UAV operation were UAV battery failure, environmental obstacles on the operation route, and UAV operation supervision technology. FBN reverse inference showed that environment-related risk (79%) and UAV equipment risk (60%) were the main risk factors in the UAV operation process. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Influence of job stress and burnout on unsafe behaviors of construction workers ZHOU Jianliang, HU Feixiang, XING Yandong, GAO Jiarui China Safety Science Journal    2022, 32 (11): 14-22.   DOI: 10.16265/j.cnki.issn1003-3033.2022.11.2539 Abstract （720）   HTML （25）    PDF（pc） （1817KB）（810）       Knowledge map    Save In order to deeply explore the relationship between job stress and burnout in unsafe behaviors of construction workers, firstly, based on the work characteristics of construction workers and literature research, individual safety cognition and team safety climate were selected as mediating variables. Psychological resilience, psychological detachment and psychological capital were introduced as moderating variables to model the hypothesis of the effects of job stress and burnout on construction workers' unsafe behaviors. Questionnaire research was conducted by drawing on mature psychological scales, using SPSS 26.0 and AMOS 24.0 for reliability and validity analysis, SEM and validation of research hypotheses, and Mplus 8.0 for modeling the moderating effects of psychological moderating variables. The results show that job stress and burnout contribute significantly to construction workers' unsafe behaviors, and job stress is positively correlated with burnout. Individual safety cognition and team safety climate have significant mediating effects between job stress-unsafe behaviors and burnout-unsafe behaviors. Psychological resilience significantly negatively regulates the relationship between job stress and unsafe behaviors, psychological detachment significantly negatively regulates the relationship between burnout and unsafe behavior, and psychological capital significantly negatively regulates the relationship between job stress and burnout, that is, psychological adjustment can effectively reduce the unsafe behavior tendency of workers. It is recommended that construction companies should combine psychological adjustment measures to prevent workers' unsafe behaviors by relieving work stress, reducing burnout, improving individual safety perceptions, and improving the safety atmosphere in the work group. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Safety risk assessment for low and medium altitude general aviation flight plans HUANG Jingyang, PAN Xuan, FU Xiaorong, GAO Jianwei, PAN Weijun China Safety Science Journal    2023, 33 (12): 23-30.   DOI: 10.16265/j.cnki.issn1003-3033.2023.12.1873 Abstract （708）   HTML （8）    PDF（pc） （3934KB）（207）       Knowledge map    Save To promote the air safety of low and medium altitude general aviation, a safety risk assessment system for low and medium altitude general aviation flight plans was established. Firstly, combined with the regulations and policies, safety factors of general aviation flight plans were investigated to obtain the risk assessment indicators, which included the complexities of flight plans, the completeness of equipment, the sites and heights of obstacles, the conflicts of flights, and personnel and environmental conditions. Secondly, the BWM was utilized to process the evaluation information of indicator importance preference, and thus the weights of risk assessment indicators were determined. Thirdly, a series of risk computation models were developed according to the characteristics of indicators based on flight plan information. Finally, the total risk value was calculated and classified into five risk levels from very low to very high, and the risk assessment system for low and medium altitude general aviation flight plans was developed. The results show that the indicator of pedestrian risk has the biggest weight and the indicator of flight plan complexity risk has the smallest weight by using the proposed method. The indicators with high risk of a general aviation flight plan are the complexity of flight plan, the collision of flights and the dispatch release. The total risk value is 0.088 and the risk level is the lowest level. The flight plan is the optimal choice through comparing the total risk values. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Progress and prospect of integrated full-dimensional monitoring and early warning technology for landslides CHENG Gang, WANG Zhenxue, LI Gangqiang, ZHU Honghu, SHI Bin China Safety Science Journal    2023, 33 (1): 105-114.   DOI: 10.16265/j.cnki.issn1003-3033.2023.01.1144 Abstract （703）   HTML （13）    PDF（pc） （7358KB）（433）       Knowledge map    Save In order to deal with the superposition effect of human engineering activities and natural geological processes under the complex and changeable geological environment in China, the limitations of single monitoring means in characterizing the landslide hazard evolution process was broken to realize the early identification of landslide hazards and accurate early warning of disasters. Firstly, this paper generally describes the current research status of full-dimension monitoring and early warning technology of integrated monitoring for the air, space, ground, and interior. Then from the aspects of early identification and emergency monitoring of potential hazards, multi-source and multi-dimensional integrated intelligent monitoring, cross-monitoring of new materials and new processes, and monitoring of submarine landslide based on DAS(Distributed Acoustic Sensing) technology. The achievements of theory, technology, and application in landslide monitoring and early warning in recent years are summarized. Finally, based on the limitations of various monitoring technologies, the challenges and development trends of current landslide monitoring are prospected. The research shows that various technologies' application conditions, advantages, and disadvantages are obtained through the comprehensive comparison of landslide integrated full dimension monitoring and early warning technologies. However, the difference in various monitoring technical indicators often leads to missing and miscalculating monitoring data. In the future, the research should focus on early warning criteria and system modeling. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Application of blockchain technology in emergency management: hotspots, challenges and prospects FAN Zhongqi, DAI Lin China Safety Science Journal    2023, 33 (5): 182-190.   DOI: 10.16265/j.cnki.issn1003-3033.2023.05.1377 Abstract （702）   HTML （13）    PDF（pc） （5031KB）（815）       Knowledge map    Save To effectively clarify the research status of blockchain technology in the field of emergency management, by applying the Preferred Reporting Items for Systematic Reviews and Meta-Analyses review method, a SLR identified 58 topic-related studies from the Web of Science and China National Knowledge Internet journal database. This paper summarized the challenges faced by the application of blockchain technology in emergency management and suggestions for application of blockchain in emergency management were proposed, including perfecting policies and regulations on application of blockchain, fueling development of key blockchain technology, strengthening construction of professional talent team and enhancing coordination of blockchain and other technologies, etc. The results show that the application of blockchain in emergency management is in its early booming stage of development. Based on these 58 studies, three main themes were developed: data management (40.3%), efficiency improvement (40.3%) and concept development (19.4%). These 3 themes can be further subdivided into 8 sub-themes. It presents the need for improving technical functionality, efficient management of emergency data and data security, integrity and data sharing efficiency. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Research and practice on construction of double prevention mechanism in large enterprises:taking COFCO Corporation as an example CHEN Zhigang, YAN Li, WANG Haojie, REN Yanqing China Safety Science Journal    2023, 33 (3): 27-34.   DOI: 10.16265/j.cnki.issn1003-3033.2023.03.1402 Abstract （695）   HTML （12）    PDF（pc） （2972KB）（501）       Knowledge map    Save In order to solve the problem of multi-level safety management and layer-by-layer attenuation in large enterprises, improve the efficiency of safety management, and effectively curb the occurrence of various production safety accidents, combined with the characteristics of production and operation of COFCO Corporation and the reality of safety management, according to the general principles of headquarters coordination, professional company responsibility and grass-roots enterprise landing, this paper explored the basic framework and main tasks of the construction of dual prevention mechanism in large enterprises, put forward the classification standards of safety risks and hidden dangers, and established the safety risk control outline of industral chain as the core. Based on the whole chain, whole process, whole staff and all-round, "four-wide" risk classification control and hidden danger investigation and management mechanism was also founded. The results show that "four wide" dual prevention mechanism can accurately understand the base of safty risks of large enterprises, systematically implement safety risks control measures and dynamically and continuously improve them, and ensure that safety risks are always controllable. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Statistical analysis and countermeasures of major accidents in coal mines in China WANG Haijun, QI Qingjie, LIANG Yuntao, QI Qingxin, LIU Yingjie, SUN Zuo China Safety Science Journal    2024, 34 (9): 9-18.   DOI: 10.16265/j.cnki.issn1003-3033.2024.09.0208 Abstract （692）   HTML （18）    PDF（pc） （13080KB）（99）       Knowledge map    Save To reveal the characteristics of coal mine accidents in China in recent years, and put forward targeted countermeasures and suggestions for accident prevention, firstly, the major and catastrophic coal mine accidents in China from 2013 to 2023 were collected and analyzed from the aspects of the year, type, month, province and cause of the accident. Secondly, taking "2·22" particularly serious collapse accident in Inner Mongolia Xinjing coal mine as an example, the accident was analyzed based on 24Model. Finally, combined with the above analysis and research results, the accident prevention countermeasures and suggestions in line with the current situation of coal mine safety production in China were put forward. The analysis and research results show that the number of major accidents and deaths in coal mines has shown an overall downward trend, and the level of coal mine safety production in China has significantly improved since the 12th Five Year Plan. Gas accidents are still the main accidents in coal mines in China, accounting for 51%. The fourth quarter of each year is a period of high incidence of coal mine accidents, accounting for 30.43% of the total number of accidents. Affected by geological conditions and occurrence, accidents often occur in the main coal producing areas. The proportion of accidents caused by unsafe human behavior is as high as 74%. When there are hidden dangers at both the individual and organizational levels and the dual prevention measures are not in place, accidents are likely to occur. Countermeasures and suggestions for reducing coal mine safety accidents are put forward from four dimensions, including safety supervision, strengthening safety through science and technology, team development and safety culture. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Generation mechanism of weak prevention in process of accident risk governance ZHANG Jian, HU Chunyan China Safety Science Journal    2024, 34 (12): 24-33.   DOI: 10.16265/j.cnki.issn1003-3033.2024.12.0580 Abstract （675）   HTML （3）    PDF（pc） （2747KB）（75）       Knowledge map    Save In order to promote the precise governance goals of accident risks, a research method combining process-tracking based on actor network theory and case comparative analysis was adopted to study the weak prevention generation mechanism in the process of accident risk governance. Firstly, the technical environment for analyzing the evolution process of accident risk was clarified, including prepositive contexts, structural scenarios, and developmental circumstances, as well as the analysis logic based on Lens Model and dimensions of time, space, and structure, to provide a research foundation for the integrity analysis of accident risk production process. Secondly, based on the case comparative analysis of the tracking of the interaction process between different types of actors and risks, the role change picture of the core actors, homeowners and rainstorm, in the process of accident/disaster risk governance and accident/disaster generation was presented integrally. Finally, a comparative analysis and reflection of case studies based on tracking the interaction between different types of actors and risks were summarized, and the essence and generation mechanism of weak prevention in the process of accident risk governance were proposed. The results indicate that the mixed interaction between human and non-human actors can continuously activate the emergence and mutual construction process of new actors, new intersectionality, and new vulnerabilities in the system, subsequently resulting in the non-stationary evolution of accident risk production environment and risk structure, which leads to intervention failure and recurrence of weak prevention in the process of accident risk governance. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Research on fire-extinguishing performance of hydrogel fire extinguishing agent on lithium iron phosphate battery pack ZHANG Zuorui, ZHANG Guowei, ZHU Guoqing, LI Zheng, YUAN Diping, JIN Changwei China Safety Science Journal    2023, 33 (1): 161-168.   DOI: 10.16265/j.cnki.issn1003-3033.2023.01.0083 Abstract （651）   HTML （21）    PDF（pc） （6281KB）（1156）       Knowledge map    Save In order to explore the efficient fire extinguishing agent for the thermal runaway behavior of lithium iron phosphate battery packs, a lithium battery combustion-suppression test platform was built, and a 27 Ah lithium iron phosphate battery pack was selected to induce thermal runaway of the battery to fire with a 300 W external heat source. On the basis of the test of thermal runaway behavior of water blocking lithium iron phosphate battery, the blocking effect of hydrogel fire extinguishing agent on thermal runaway behavior of lithium iron phosphate battery pack was carried out, and the parameters such as thermal runaway burst time and temperature change rate of lithium-ion battery pack were compared and analyzed. The results show that the cooling depth of the lithium battery pack by water is insufficient and the utilization rate is not high, which cannot effectively block the thermal runaway propagation between the battery packs. The hydrogel fire extinguishing agent can quickly extinguish the open flame, and the surface temperature of the battery is always lower than the thermal runaway critical temperature after the end of spraying, which can effectively block the thermal runaway behavior of the battery pack. The greater the spray rate of the fire extinguishing agent, the more obvious the thermal runaway propagation of the battery pack is prevented, and the large flow of hydrogel fire extinguishing agent can completely prevent the thermal runaway propagation between the battery pack monomers. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Gas station unsafe behavior detection based on YOLO-V3 algorithm CHANG Jie, ZHANG Guowei, CHEN Wenjiang, YUAN Diping, WANG Yongsheng China Safety Science Journal    2023, 33 (2): 31-37.   DOI: 10.16265/j.cnki.issn1003-3033.2023.02.0298 Abstract （649）   HTML （31）    PDF（pc） （5098KB）（510）       Knowledge map    Save In order to control the fire and explosion risk target of gas station, an unsafe behavior detection model of gas station based on YOLO-V3 algorithm was proposed by combining accident statistics and fault tree analysis,. Firstly, on the basis of collecting 90 gas station fire and explosion accidents, the ignition sources of gas station fire and explosion accidents were statistically analyzed. Secondly,. the fire and explosion fault tree of gas station was constructed, the structural importance of each basic event was calculated, and the unsafe behavior with high risk of gas station was determined. Then, the image data of unsafe behavior of gas stations were collected by field collection and simulation, and the image data set of unsafe behavior of gas stations was constructed by data enhancement method. Finally, based on the deep learning method, the unsafe behavior detection model of gas station was constructed, and the final model was obtained after 1000 training iterations. The results show that the unsafe behaviors that cause fire and explosion accidents in gas stations mainly include smoking, calling and so on. The average detection accuracy of the trained detection model for smoking, calling and normal behavior detection categories on the test set is 67%, 85% and 77%, respectively, and the average detection accuracy of the model is 84%. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Collision scenario construction and simulation analysis for autonomous driving safety testing ZHAO Yaohua, CHEN Yanzhan, ZHENG Liang, LI Shukai China Safety Science Journal    2024, 34 (7): 211-218.   DOI: 10.16265/j.cnki.issn1003-3033.2024.07.0247 Abstract （630）   HTML （5）    PDF（pc） （5973KB）（70）       Knowledge map    Save To reduce traffic accidents caused by autonomous vehicles and improve the efficiency of vehicle safety testing in simulation environments, an autonomous driving collision test scenario construction method was proposed based on deep reinforcement learning. Firstly, the vehicle's driving process was mapped to a Markov decision process by setting the state, action, and reward functions. Then, the agent was trained to complete the vehicle collision task and generate the collision test scenarios based on the built simulation platform (CARLA-DRL). Finally, 500 random collision simulation tests were conducted to analyze the collision success rate, collision time, and collision energy based on the relative distance between the agent and the autonomous vehicle. The results indicated that the agent generated collision trajectories that conformed to vehicle dynamics and could construct refined and multi-type collision test scenarios. The average collision success rate between the agent and the autonomous vehicle was 62.20%, the average collision time was 127.25 s, and the average collision energy value was 175.98 kJ. The proposed method can construct high-frequency, high-efficient, and high-risk autonomous driving vehicle collision test scenarios, increasing the probability of occasional high-risk scenarios in simulation scenarios and enhancing the efficiency of safety testing for autonomous vehicle collision incidents. Table and Figures | Reference | Related Articles | Metrics | Comments（0）

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Research on acceptable criteria for individual and societal risks of urban gas pipeline ZHANG Peng, XIAO Bowen, SONG Wenqi, LIU Wei China Safety Science Journal    2023, 33 (10): 1-7.   DOI: 10.16265/j.cnki.issn1003-3033.2023.10.2157 Abstract （616）   HTML （9）    PDF（pc） （2742KB）（187）       Knowledge map    Save In respond to the higher requirement for clean energy put forward by the 14th Five-Year plan, the risk acceptable criteria of urban gas pipeline were studied from the perspective of life risk, in order to make the safety management level of urban gas pipeline can meet the needs of development. The accident data of 2012-2021 were counted by combining average individual risk (AIR) method with ALARP criterion, and the risk acceptable criteria of the previous five-year cycle were used for analysis and comparison. The reference value of the risk acceptable criteria of the next five-year cycle was predicted by adopting the risk acceptable criteria of the previous five-year cycle, and the reference value of the acceptable criteria of individual risk from 2022 to 2026 was obtained. According to the five-year cycle prediction method discussed in the individual risk acceptable criteria study, the F-N curve method was used to calculate the number of deaths per accident and annual pipeline length from 2017 to 2021, and the societal risk acceptable criteria was determined. The study shows that the risk level of 1.017 13×10-7 is the boundary of the unacceptable risk area and ALARP area, and the risk level of 2.034 27×10-7 is the boundary of ALARP area and acceptable risk area. In the societal risk study, the intolerable line and the negligible line are determined, and the risk region is determined according to the ALARP criterion. Table and Figures | Reference | Related Articles | Metrics | Comments（0）