Classification Of Degree Of Geological Environment Destruction In Subsidence Area Of Mountain Coal Mining

Geological environment problem is an effective and practical method of putting forward environmental protection measures.The mining of coal resources makes the geological environment problem of mining subsidence area more and more obvious.The geological environment of subsidence area is the result of human activities and geological background.There are many and complicated influencing factors,and scientific and reasonable evaluation methods are constantly being explored.Therefore,the establishment of an evaluation method has important guiding significance for the prevention or treatment of geological environment in coal mining subsidence area.Taking Chongqing Coal Mine as the research object,Several types of geological environment problems are summarized in several coal mines in Chongqing,and two major factors affecting the geological environment of mining subsidence area are extracted.Through the analysis of influencing factors and the characteristics of Chongqing coal mine,AHP-fuzzy comprehensive evaluation model is selected to carry out the research.Based on the analysis of the production data and geological data of Tongda No.1 Mine in Chongqing,the damage degree of geological environment in the mining subsidence area of Tongda No.1 Mine is calculated as strong by using the model.According to the specific reasons,the corresponding solutions are put forward,and the reasonable treatment technology is put forward for the production area and the mining area.Through the above analysis and research,the content and results of this paper are as follows:(1)Based on the analysis of coal mine data in Chongqing,several types of geological environmental problems in mining subsidence area of Chongqing coal mine are summarized,including geological hazards caused by coal resource exploitation,groundwater drainage and surface water level decline,land occupation,destruction and soil erosion,and a large number of deformation of surface buildings.(2)Through influencing factors of geological environment problems,15 basic influencing indicators are extracted,namely,landform type,complexity of surface geological environment,lithology,dip angle,fault,fold,post-mining time,goaf treatment method,mining depth-thickness ratio,repeated mining times,output,mine water inflow,full mining degree,rationality of coal pillar setting,mining range.Establishment of an impact factor indicator system.(3)Through the analysis of mines and basic impact indicators,the evaluation model is determined,and the weight of AHP index is used to check its consistency.Combined with the value of index and the characteristics of mine geological environment,the trapezoidal distribution function and semi-trapezoidal distribution function are selected to determine the membership degree.Finally,a complete mathematical model for classification of geological environment damage degree in mining subsidence area is established.(4)This model is verified by selecting Chongqing Tongda No.1 Coal Mine.By analyzing the data from Tongda No.1 Coal Mine,the values of basic indexes are obtained.After quantifying the qualitative indicators and bringing them into the model,the classification of environmental damage degree of Tongtong No.1 Mine is strong.The actual geological environmental impact of the mine is also strong,which is consistent with the damage grade calculated by the mathematical model.The validity of the model is verified.