某矿山地下开采对上覆岩层稳定性影响分析

Analysis of the influence of underground mining on the stability of overlying strata in a mine

某锰矿围岩稳固性较差,矿体厚度较薄,矿体埋藏很深,埋深达1400 m。为了确保地表稳定,采用FLAC^(3D)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。通过模拟计算结果表明: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“综采工艺”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2 cm,同时地表未产生塑性扰动区,说明地表处于安全稳定状态。该研究结果为指导矿山生产建设和地表安全稳定提供了理论决策依据。

The stability of the surrounding rock in a manganese mine is poor,and the thickness of the ore body is relatively thin.The ore body is buried deeply,with a depth of up to 1400 m.In order to ensure the stability of the surface,the FLAC^(3D)finite difference procedural law method is used to simulate the impact of underground mining on the stability of the surface.At the same time,the impact of the excavation and filling of the underground ore body section by section on the stability of the stope and the surface is calculated and analyzed.The simulation calculation results show that the movement of the rock layer is a dynamic process transmitted from bottom to top.The underground ore body can effectively reduce the deformation of the surrounding rock and surface subsidence by using the“fullymechanized mining”mining method.The subsidence deformation caused by underground mining on the surface is very small,only 2 cm.At the same time,there is no plastic disturbance zone on the surface,indicating that the surface is in a safe and stable state.The research results provide a theoretical decisionmaking basis for guiding mining production and construction,as well as surface safety and stability.