关键词: 离散元, 深部开采, 崩落法, 岩层移动, 数值模拟

Abstract: With the increase of mining depth，rock mechanics conditions become complicated.Strata movement law of deep mining by caving method is affected by many factors and is different from the shallow.Discrete element method is a numerical method based on the assumption of discontinuity，which is particularly suitable for solving the discontinuity problem of jointed rock mass.Based on the discrete element theory，using numerical calculation software 3DEC，the rock movement law affected by different joint angle，different lateral pressure coefficients and different stages of excavation during caving process of deep ore body were analyzed.The results showed:Dominant structural plane with different dip angle had a significant influence on caving trends.And horizontal joints had a good role in promoting the development of caving；The larger lateral pressure coefficient，the smaller the height caving；During the mining process，large-scale subsidence did not occur when the mining height was 120 m because of bearing arch.The results can provide a frame of reference for determining for the law of strata movement and surface subsidence range of deep ore caving mining method.

Key words: Discrete element method, Deep mining, Caving method, Strata movement, Numerical simulation