Physical simulation test research on overlying rock failure during coal seam mining in Yushuquan Coal Mine
In order to study the overlying rock failure of coal seam mining,taking Yushuquan Coal Mine as the engineering background,the physical similarity simulation test was used to analyze the overlying rock failure law in the process of coal seam mining.Combined with the calculation of empirical formula,the height of the overlying rock water conducted zone was determined.The results show that with the mining of coal seam,the development speed of overlying rock fracture slows down in the longitudinal direction,and the develop-ment speed of the horizontal fracture is accelerated and the scope is expanded.Moreover,the fractures near the working face gradually develop to the fracture type.The overlying rock morphology presents the characteristics of first extending and then stabilizing in the hori-zontal,vertical,and overall directions,and finally tends to"saddle shape".The displacement of overlying rock decreases with the in-crease of vertical distance from coal seam working face,and the displacement decreases from both sides to the middle.The maximum height of the simulated water conducted zone is 65 m,which is consistent with the results calculated by the empirical formula,and the fracture production ratio is about 16.The results can provide scientific basis for the control of roof water damage in Yushuquan Coal Mine.
physical similarity simulationoverlying rock failure lawfissure developmentheight of water conducted zone
万方数据
维普
