Study On The Law Of Surface Subsidence And Movement And Deformation Of Overvurden Due To Longtan Mining

After the underground coal is exploited,the balanced state of the in-situ rock stress is destroyed and achieves a new balanced state ultimately,accompanying movement,deformation and destruction of overburden in this process.And the movement and deformation of overburden will develop to the surface when the work face is advancing,causing the movement and deformation of surface and then making many kinds of geological environment problems,for example,surface subsidence and destruction of ground buildings.And those problems are made by the movement and deformation of ground and overburden essentially.Therefore,studying the movement and deformation of overburden and ground in the entire mining process not only provides new ideas and thinkings for the protection of geological environment and prevention and control of disaster,but also has great theoretical meaning and practical value for the future production of coal mine.Taking 3115 working face of coal mine as an example,we study and analyze the law of surface subsidence and the movement and deformation of overburden.And the main results are as follows:(1)The characteristics and chang rules of surface subsidence are attained due to underground mining through establishing surface subsidence observation system.(2)By the simulation and analysis of Flac3D(numerical modeling software),the movement and deformation and the law of stress distribution of overburden are achieved in the mining process of working face,revealing the law of movement of overburden of mining subsidence.(3)Based on the results of field measurement and numerical simulation,the measures of prevention and control of environmentally geological disasters of coal mine are proposed.