Study On Coal Mining Subsidence Disasters And Influencing Factors In Jinfeng And Qingshuiying Coal Mines In Ningdong Coal Mining Base

China's energy structure is based on coal resources,large-scale exploitation and utilization of coal resources on China's economy and people's livelihood has brought great convenience,but on the other hand,coal mining will inevitably produce all kinds of geological and environmental problems.Which is the economic construction and the greatest impact on people's lives is caused by ground fissures and subsidence and other disasters.Coal mining subsidence is an edge research field,which integrates engineering geology,mining,mechanics,mathematics,geology,measurement,hydrology and other disciplines,and in the actual study,by the local geological conditions,coal mining methods and other factors,it is difficult An accurate prediction of the disaster caused by coal mining in a region.Based on the previous research,this thesis systematically studies the status quo,cause analysis,the cause of the disaster and the influencing factors of the disaster caused by the local coal mining.The finite element simulation method is applied to the Jinfeng The surface tension and the settlement of the ground subsidence are studied in this thesis,and the influence of roadway depth and topsoil on the mining subsidence is analyzed.Through the comparative analysis of field survey,coal mine data and numerical simulation,To assist in the development of new minefields and minefields that have been mined,and the environmental management measures of the mining enterprise have certain The guiding significance.The physical and mechanical properties of the underground rock are similar to those of the Qingshuiyingying and Jinfeng Minefield.However,the surface soil of Jinfeng Minefield is aeolian sand,and the physical and mechanical properties are worse than those of Qingshuiying.The simulation results show that the greater the depth of the roadway,the less difficult it is to reach the surface of the tunnel,the smaller the surface tension,the less prone to cracks,and the settlement will be reduced;and the topsoil nature of the shape of the crack is almost decisive,The greater the soil viscosity,the size of the cracks produced about large.The location of the fracture is closely related to the location of the roadway.Large fractures are generally parallel to both sides of the roadway,and the top of the roadway is rare.However,there are small cracks in the direction perpendicular to the tunneling direction,In the Jinfeng field and several other poor nature of the surface found.This thesis puts forward some new ideas for the mechanism and law of coal mining subsidence,and makes some help for the mine environment problem in Ningdong area.It also has the guiding significance to guarantee the safety of life and property of residents near the local mines and the safe production of mining enterprises.