Study on finite element simulation and in-site monitoring of ground subsidence law for omprehensive mechanized caving coal mining under railway

摘要

With the project of mining 701 working face of Baojianshan Coal mine of Jingyuan Coal Indus try Group under mine special railway as a background, the authors predict ground subsidence law caused by routine comprehensive mechanized caving coal mining method and back filling method with elastic-plas tic nonlinear FEM. By different exploitation methods, development law of horizontal displacement, vertical displacement, shift angle of strata during mining is given. According to predication results by FEM soft ware ANSYS, the maximum vertical settlement of subsidence area near railway subgrade is 7cm, which is caused by mining 701 working face. The in-situ monitoring results were essentially identical with the FEM predication values, which indicates that FEM predication is reliable. The rehabilitation technical measure of railway bed and deformation monitoring scheme of railway during long-term operation are advised.