采动边坡失稳的动力过程及典型变形破坏机理

以平朔矿区露天井工协调开采工程实践为背景,采用物理模拟与数值分析相相结合的方法,分析了采动边坡的变形破坏特征与应力分布规律,揭示了"关键硬岩层"与"关键弱层"耦合作用下采动边坡的变形破坏模式与典型失稳机理,提出了采动边坡变形破坏演化的四阶段理论,即表生改造、结构改造、时效变形和最终失稳(稳定),建立工程力学模型,推导出了采动边坡进入时效变形和最终失稳(稳定)阶段的判据。

Dynamic process and typical deformation-failure mechanism of mining slope

Based on the open-pit and underground mining engineering practice in Pingshuo mining area，the physical simulation and numerical analysis were combined to investigate the deformation-failure characteristics and stress distribution rule of mining slope.Therefore，the deformation-failure mode and the typical instability mechanism of mining slope under the coupling effects of key hard strata and key weak strata were revealed.A four-stages theory of deformation and destruction of mining slope was put forward，including epigenetic recreation of rockmass structures stage，structure transformation stage，time-dependent deformation stage and eventually unstable (stable) stage.Then the engineering mechanics model was established.The criterion of mining slope into the time-dependent deformation stage and eventually unstable (stable) stage were deduced.