Gas disasters always restrict the tunnel constructions in mountain area, which becomes a major geological barrier against the development of underground engineering. China is rich in coal resources and has a large amo...Gas disasters always restrict the tunnel constructions in mountain area, which becomes a major geological barrier against the development of underground engineering. China is rich in coal resources and has a large amount of gas with a wide range of distribution. However, China experienced not only adverse effects on coal mining but also gas disasters in underground engineering construction, such as tunnels and chambers. With the increased number of tunnels passing through coal-bearing strata, the incidence of gas accidents is also rising. Therefore, the significance of preventing and mitigating gas disasters should be emphasized, and an effective risk assessment method for gas disasters should be established. On the basis of research on over 100 gas tunnels in China, a relatively ideal gas disaster risk assessment method and system for tunnels are established through the following measures. Firstly, geo-environmental conditions and gas situations were analyzed during construction. Secondly, qualitative analysis was combined with quantitative analysis. Finally, the influencing factors of gas disasters, including geological conditions, gas,and human factors, were investigated. The gas tunnel risk assessment system includes three levels:(1) the grading assessment of a gas tunnel during the planning stage,(2) the risk assessment of gas tunnel construction during the design and construction stages,(3) the gas tunnel outburst risk assessment during the coal uncovering stage. This system was applied to the dynamic assessment of gas disaster during the construction of the Zipingpu tunnel of Dujiangyan–Wenchuan Highway(in Sichuan, Southwest China). The assessment results were consistent with the actual excavation, which verified the rationality and feasibility of the system. The developed system was believed to be back-up and applied for risk assessment of gas disaster in the underground engineering construction.展开更多
Zhao Suqi, director of the investigation and statistics department of the State Administration of Mine Safety, said at the press conference that in 2020, there were approximately 120 mine accidents and about 220 death...Zhao Suqi, director of the investigation and statistics department of the State Administration of Mine Safety, said at the press conference that in 2020, there were approximately 120 mine accidents and about 220 deaths in China, down about 27% from the corresponding period of last year. At present, the main causes of frequent production safety accidents are the low safety working position in coal mining, lack of crisis awareness, insufficient real-time supervision, insufficient attention to disaster prevention by various departments, high mining risk coefficient, illegal subcontracting, overcapacity, over-exploitation and inadequate safety management at the grass-roots level. However, in recent years, the number of accidents and deaths has decreased as compared with that of previous years, which shows that we have achieved certain results for the "safety first" coal enterprises in the past, and on the other hand, it shows that coal mine safety production is indeed very important. Although the coal mine safety management has made some progress, the current situation of safety in production is still very difficult, with more than large accidents occurring from time to time. These accidents reflect the problems of inadequate implementation of the main responsibilities of coal mining enterprises, repeated violations of laws and regulations, repeated punishment and improvement of supervision efficiency. Therefore, we must be alert at all times, strictly in accordance with the relevant rules and regulations of the coal mine, and standardize the operation.展开更多
基金support by the National Natural Science Foundation of China (Grant No. 41302244)
文摘Gas disasters always restrict the tunnel constructions in mountain area, which becomes a major geological barrier against the development of underground engineering. China is rich in coal resources and has a large amount of gas with a wide range of distribution. However, China experienced not only adverse effects on coal mining but also gas disasters in underground engineering construction, such as tunnels and chambers. With the increased number of tunnels passing through coal-bearing strata, the incidence of gas accidents is also rising. Therefore, the significance of preventing and mitigating gas disasters should be emphasized, and an effective risk assessment method for gas disasters should be established. On the basis of research on over 100 gas tunnels in China, a relatively ideal gas disaster risk assessment method and system for tunnels are established through the following measures. Firstly, geo-environmental conditions and gas situations were analyzed during construction. Secondly, qualitative analysis was combined with quantitative analysis. Finally, the influencing factors of gas disasters, including geological conditions, gas,and human factors, were investigated. The gas tunnel risk assessment system includes three levels:(1) the grading assessment of a gas tunnel during the planning stage,(2) the risk assessment of gas tunnel construction during the design and construction stages,(3) the gas tunnel outburst risk assessment during the coal uncovering stage. This system was applied to the dynamic assessment of gas disaster during the construction of the Zipingpu tunnel of Dujiangyan–Wenchuan Highway(in Sichuan, Southwest China). The assessment results were consistent with the actual excavation, which verified the rationality and feasibility of the system. The developed system was believed to be back-up and applied for risk assessment of gas disaster in the underground engineering construction.
文摘Zhao Suqi, director of the investigation and statistics department of the State Administration of Mine Safety, said at the press conference that in 2020, there were approximately 120 mine accidents and about 220 deaths in China, down about 27% from the corresponding period of last year. At present, the main causes of frequent production safety accidents are the low safety working position in coal mining, lack of crisis awareness, insufficient real-time supervision, insufficient attention to disaster prevention by various departments, high mining risk coefficient, illegal subcontracting, overcapacity, over-exploitation and inadequate safety management at the grass-roots level. However, in recent years, the number of accidents and deaths has decreased as compared with that of previous years, which shows that we have achieved certain results for the "safety first" coal enterprises in the past, and on the other hand, it shows that coal mine safety production is indeed very important. Although the coal mine safety management has made some progress, the current situation of safety in production is still very difficult, with more than large accidents occurring from time to time. These accidents reflect the problems of inadequate implementation of the main responsibilities of coal mining enterprises, repeated violations of laws and regulations, repeated punishment and improvement of supervision efficiency. Therefore, we must be alert at all times, strictly in accordance with the relevant rules and regulations of the coal mine, and standardize the operation.
