Prediction And Restoration Of Ground Subsidence In Wulanmulun Coal Mine,Inner Mongolia

This paper takes Wulanmulun coal mine in Inner Mongolia Autonomous Region as the research object,According to the field investigation data and research analysis,this paper summarizes the distribution and subsidence characteristics of coal mine surface subsidence area in the study area.On the basis of detailed investigation,theoretical analysis,laboratory test,computer software simulation and other methods are used to systematically study and scientifically predict the mechanism and quantitative evaluation technology of ground subsidence area formed by the development of coal resources in the study area.The damage and harm of ground subsidence to geological environment are described in detail,and reasonable and feasible environmental restoration and control measures are put forward.The main conclusions and understandings of this study are as follows:1?The current ground subsidence is located in the upper part of 1-2 coal goaf in the study area.The cracks formed in the early goaf are wider than those in the late goaf in the same stratum.The width of the cracks on the slope near the valley is larger than that on the top of the slope,which belongs to small ground cracks.2.It is predicted that a subsidence basin will be formed on the surface of the mine in the next five years,with a total area of about 15.0460km~2.The manifestation of surface subsidence is that the surface cracks develop parallel to the boundary of the goaf.The surface subsidence gradually decreases from the middle to the edge of the goaf,forming a subsidence basin.Tensile ground fissures are formed at its edge.The mining area of44.650km~2 will be formed in the long term.3.This paper analyzes the law of surface movement and deformation and the characteristics of subsidence disaster in the upper part of goaf after coal mining,and formulates reasonable and feasible countermeasures for ground subsidence prevention and control.The monitoring and early warning measures,engineering measures and biological measures of the corresponding ground subsidence areas can effectively eliminate the potential safety hazards,ensure the safety of mining workers,surrounding people and vehicles,and provide reference for the recovery and treatment measures of ground subsidence in surrounding mining areas.