| Coal resources have long been a pillar of the country’s energy strategy,and despite the declining share of coal consumption,the absolute volume is still growing,which has led to the country’s raw coal output climbing year by year,with total domestic coal production exceeding4.45 billion tons in 2022,up 8 percent year on year.While coal output keeps increasing,safety accidents occur frequently in coal mine in our country.In 2021,there were 91 coal mine accidents,killing 198 people,and in 2022,there were 168 coal mine accidents,killing 245 people.The occurrence of coal mine safety accidents,in addition to the implementation of the main responsibility of the enterprise is not in place,mostly related to the water disaster,gas,roof,rock burst and other hidden disaster factors of the survey and control is not in place.In this paper,based on the survey of hidden disaster factors in 45 production mines in Yushen mining area,the distribution law of hidden geological bodies in Yushen mining area is comprehensively and systematically analyzed on the scale of mining area by mathematical statistics,spatial analysis,fuzzy calculation and other methods,and the disaster risk of various hidden geological bodies is graded and evaluated,and the disaster types of hidden factors in Yushen mining area are classified.The prevention and control measures of main hidden disaster hazards are put forward.The following results have been achieved:(1)Based on the existing standards,norms and research frontiers,The TOPSIS concealed disaster risk comprehensive score model was established,and then the main concealed disaster factors in Yushen mining area were identified on the regional scale according to grey correlation degree and frequency distribution analysis.The main hidden disaster factors in Yushin mining area are identified as goaf,water-conducting fissure zone,poorly sealed borehole,underground water body(including burnt rock),spontaneous combustion tendency of coal seam,skylight,ancient riverbed scour zone and other bad geological bodies.(2)The classification threshold system of hidden disaster factors was established,and the classification risk of various hidden disaster factors was evaluated.The water hazard areas are mainly distributed in the northwest of Hanglaiwan Coal mine of Yushen Phase I,the east of Xuemiaotan Coal mine and the northeast of Dongfeng Coal mine,and the middle of Xiaobaodang No.1 well field of Yushen Phase III.The large area of skylight disaster risk is mainly distributed in the west of Jinjie Coal Mine of Yushen Phase II,and the large area of ancient riverbed scour zone disaster risk is mainly distributed in Yushen Phase IV planning area.All the coalfields in Yushen mining area are coal seam spontaneous combustion hazard areas.(3)The spatial superposition of water hazard area,adverse geological body danger area and fire hazard area is carried out in GIS,and the hidden disasters in Yusheng Mining area are divided into four types: "water hazard + adverse geological body + fire" type,"water hazard +fire" type,"adverse geological body + fire" type and "fire" type.(4)The detection and prevention technology system of hidden disaster factors in Yushen mining area is put forward.Based on the distribution law,spatial combination type and characteristics of hidden disaster factors in Yusheng mining area,a four-in-one comprehensive hidden disaster detection and prevention technology system of "comprehensive investigation,verification,treatment before mining,three-dimensional prevention" was proposed.Four kinds of hidden disaster combination detection methods and prevention and control technology combination modes are constructed.The main hidden disaster in Yushen mining area is water disaster,and coal seam is generally prone to spontaneous combustion.Therefore,the exploration of hidden disaster factors in Yushen mining area should focus on the exploration of hidden water disaster,and the main means include hydrogeological investigation,geophysical exploration,drilling and so on.To sum up,this paper reveals the distribution law of hidden disaster factors in Yushen Mining area,and basically explains that the focus of coal mine accident prevention in Yushen mining area is water hazard exploration and control,but at the same time,attention should be paid to the monitoring and prevention of gas factors and fire factors.The above research results provide a technical basis for disaster prevention,mitigation and control in Yushen mining area. |
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