Numerical Study on Surrounding Rock Failure and Strata Movement Caused by Underground Mining in Metal Mine
In order to elucidate the mechanism of surrounding rock failure and strata movement caused by underground mining in metal mines,the east area of Jinshandian Iron Mine was taken as an example.Based on the engineering geology of the mining area,a large three-dimensional numerical model was established by FLAC3D,and numerical calculations of underground mining were carried out.Subsequently,the failure mechanism of the surrounding rock in the complex mining goaf was revealed,and an analysis index for discontinuous deformation of the failure angle was proposed based on the plastic failure of the rock mass.The results show that the failure angle analysis index is consistent with the commonly used collapse angle index with the change of underground mining.The failure angle of the hanging wall remains approximately the same with the underground mining after the mining of-410 m level,with the value of 39°-42°.The failure angle of the footwall decreases first with the mining and then stabilizes at 65°-67° after the mining of-500 m level.In addition,the step-like fracture surface appears at the bottom of the rock layer of the hanging wall,and obvious topping-sliding failure occurs,while the failure surface of the footwall surrounding rocks is steeply inclined,and obvious shear-sliding failure occurs.The results of the study can provide a reference to the safe production of underground mining in metal mines.
Metal mineUnderground miningComplex goafStrata movementDeformation and failure
万方数据
维普
