露天煤矿破碎站荷载扰动下端帮边坡破坏机理及稳定性研究

    Study on the damage mechanism and stability of end gang slopes under load disturbance of open-pit coal mine crushing station

    • 摘要: 为分析破碎站荷载对边坡稳定性的影响机理,明确不同荷载分布情况下边坡变形破坏特征,保障矿山安全开采,本文提出基于极限平衡法的坡顶均布荷载影响下边坡安全系数的表达式,揭示了破碎站荷载对边坡稳定性的影响机理。并建立了不同荷载分布的边坡数值计算模型,研究结果表明:边坡面向临空面的位移随着安全距离的增加而降低,当安全距离小于10 m时,荷载作用的安全距离小于等于滑体条块底斜面在水平面的投影长度,边坡受破碎站荷载影响较大,滑体后缘分布有明显的拉伸屈服区,破坏模式为“剪切-拉裂破坏”,表现为“坐落-推移式”的滑动模式。当安全距离大于10 m时,滑体后缘不再受外荷载影响,破碎站作用下岩体的位移方向与水平面的夹角减小,呈现出明显的剪切破坏特征,滑动模式也转变为“圆弧型”,表现为“圆弧状”整体滑动模式,边坡安全稳定系数几乎不受破碎站荷载影响,且满足矿山安全要求。

       

      Abstract: To analyze the influence mechanism of crushing station load on slope stability, clarify the deformation and failure characteristics of slopes under different load distributions, and ensure safe mining. This paper proposes an expression for the slope safety factor under the influence of uniformly distributed loads at the top of the slope based on the limit equilibrium method, and reveals the mechanism of the influence of crushing station loads on slope stability. And numerical calculation models of slopes with different load distributions are established. The results show that the displacement of the slope facing the free face decreases with the increase of the safety distance. When the safety distance is less than 10 m, the safety distance of the load action is less than or equal to the projection length of the inclined surface of the sliding block at the horizontal plane. The slope is greatly affected by the load of the crushing station, and there is a clear tensile yield zone distributed at the rear edge of the sliding block. The failure mode is “shear tensile fracture failure”, manifested as a “sitting pushing” sliding mode. When the safe distance is greater than 10 m, the trailing edge of the sliding body is no longer affected by external loads, and the angle between the displacement direction of the rock mass and the horizontal plane under the action of the crushing station decreases, showing obvious shear failure characteristics. The sliding mode also changes to a “circular arc” shape, manifested as a “circular arc” overall sliding mode. The slope safety and stability factor is almost not affected by the load of the crushing station and meets the safety requirements of the mine.

       

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