基于FALC^(3D)的某铜矿地下开采对地表稳定性的影响分析

Influence Underground Mining on Surface Stability of Based on FALC^(3D) in a Copper Mine

某铜矿围岩稳固性好,矿体埋深较浅,埋深152~203 m。为了确保地表的稳定,采用FLAC3D有限差分程序法来模拟地下开采对地表稳定性的影响分析,同时计算分析了地下矿体逐段开挖逐段充填对采场及地表稳定性的影响。模拟计算结果表明该岩层移动是一个自下而上传递的动态过程,该地下矿体采用“留矿空场嗣后充填”采矿方式可有效降低围岩变形和地表下沉,地下开采对地表产生的下沉变形很小,仅为1.8 cm,同时地表未产生塑性扰动区,说明地表是处于安全稳定的状态。研究结果为该深部矿体安全高效回采和地表安全稳定提供了理论依据和技术指导。

The surrounding rock in the copper mine analyzed has good stability,and the buried depth of the orebody is shallow,with a buried depth of 152~203 m.In order to ensure stability of the surface,the influence of underground mining on surface was simulated by FLAC3D.At the same time,the effects of the phase-by-phase excavation and filling of the underground orebody on the stability of the stope and the surface are calculated and analyzed.Simulation results show that strata movement is a dynamic process of transfer from bottom to top,and the underground orebody adopts the“subsequent filling”method,which can effectively reduce the deformation of surrounding rock and surface subsidence,and subsidence deformation of surface is very small,which is only 1.8 cm,meanwhile the surface does not produce the plastic disturbed zone,which illustrates the surface in a stable state.The research results provide theoretical basis and technical guidance for safe and efficient mining of the deep ore body and stability of surface.