Research On The Earth Surface Subsidence Prediction Caused By Coal Mine Excavating, Protection And Recovery Measures

Coal is the main energy sources and industrial material in China. With the massive exploiture and utilization of the coal, ecological environment has been destroyed seriously in some coal mine areas. Therefore, it is significant to predict the earth surface subsidence caused by coal excavating and take the ecological environment protection and recovery measures practically.Based on the related theory of ecological environmental protection and recovery, and combined with the ecological environmental protection and recovery engineering practice for domestic and overseas coal excavating subsidence area, take the case of one excavating coal mine in Xinjiang, choose the probability integral method to predict the earth surface subsidence, and give the corresponding ecological environmental protection and recovery measures. Main achievements of this research as follows:(1) Based on the ecological field investigation and correlative data collected, analyze the actual ecological environment in the research area. Main land use types are barren land, bear land and wild grass ground. Propagation community structure is simple and species are normally common. As a whole, ecological environment is vulnerable and low ability of anti-jamming in the research area.(2) According to research factors in the research area, such as geological and coal seam occurrence mode, adopt the probability integral method suitable for calculating the earth surface subsidence of acclivitous coal seam excavating, and predict ground ecological impact degree and scope caused by subsidence.It is predicted that after all of the coal seams excavated in the research area, average subsidence superposition value of every excavating seams is 20m. Earth surface subsidence impact scope is mine field boundary enlarging 90 to 160m, maximum horizontal moving value is 2663mm, maximum acclivitous value on the ground is 66.82 to 79.25mm/m and maximum additional obliquity by slope is 3.82°to 4.53°.(3) On the basis of the prediction results and actual ecological environment, give the ecological environment protection and recovery measures practically in the research area, including confirming the subsidence comprehensive renovation goal, surface vegetation recovery, ecological compensation, ecological environmental management and monitoring plan, etc.(4) Give the approaches, which can reduce the subsidence impact, from adopting mining technology and ecological environmental recovery. Choose the cut and fill stoping and earth surface subsidence decreasing technology of partly excavating to reduce the disturbance strength of geological environment. Furthermore, natural recovery is the main method to reduce the impacts, supplemented by the manual work or simple machine used to fill cracks and level off subsidence steps.