Study on Surface Ground Movement Deformation Law Above High Cutting Long Coal Mining Face

In order to study the surface ground movement deformation law above the high cutting long coal mining face, the numerical simulation, theoretical analys is and site measuring method were applied to analyze the length variation of the high cutting long coal mining face affected to the surface ground movement deformatio n law.The critical conditions of the stability lost occurred when the pressure balanced arch of the overburden strata in the coal mining face reached a limit status and th e parameters of the surface ground movement deformation features were obtained.The study results showed that with the length of the coal mining face expanded, in th e inclined direction of the coal mining face, the separated bedding in the overburden strata would cause the height scope of the falling zone, surface ground movement deformation value and mining influence scope steadily increased.The max subsidence value and the max horizontal moving value of the surface ground would be in a li ner relationship to the mining length of the coal mining face.