露井联采逆倾边坡破坏模式及稳定性评价方法研究

首先分析了单一露天开采逆倾边坡的变形破坏模式、地下开采覆岩变形破坏机理和露井联采逆倾边坡的变形机理,在此基础上,对露井联采逆倾边坡的破坏模式及稳定性定量评价方法进行了研究。研究表明,露井联采逆倾边坡的破坏模式可分为3种类型：滑移型破坏、塌陷型破坏和滑移-塌陷复合型破坏,地下开采的空间位置对边坡的破坏模式及稳定性影响显著,其影响程度受进入塌陷范围内的边坡潜在滑面长度和岩体强度参数弱化程度的控制,据此提出了露井联采逆倾边坡稳定性的极限平衡法,并结合工程实例进行了数值模拟验证。

Failure mode and stability evolution method of counter-tilt slope under combined surface and underground mining

How to demonstrate the deformation and failure mode of the slope under combine surface and underground mining and evaluate its stability scientifically is one of the problems that need urgent solutions in mining engineering.First,the deformation and failure mode of the slope under simple surface mining,the deformation and failure mechanism of the overlying strata affected by underground mining and deformation mechanism of the slope under combined surface and underground mining were analyzed,then the failure mode and the stability calculation method of the slope under combined surface and underground mining was studied.It can be shown that the failure modes of the slope under combined surface and underground mining involve three patterns： slipping failure,subsiding failure and slipping-subsiding combined failure,that the failure modes and the stability of the slope under combined surface and underground mining be significantly affected by the underground mining positions and the influence be mainly controlled by the length of the latent slide plane of the slope and the weakening degree of the rock masses in the subsidence range.Finally,a limit equilibrium method to calculate the slope stability under combined surface and underground mining was put forward.Finally,it was proved by the numerical simulation of a project case.