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基于露天矿岩质边坡的稳定性分析及边坡角优化的需要,提出采用有限元折减强度法与极限平衡法相结合的方法对露天岩质边坡进行稳定分析,并对算例中的最终边坡角进行了优化。该方法首先利用有限元折减强度法计算出边坡内部塑性区,并假定塑性区为边坡潜在的滑动面,从而能够确定滑动面的倾角范围。此后再以此滑动面倾角范围为分析起点,结合极限平衡理论计算出在不同边坡角下的边坡安全系数。通过绘制安全系数随边坡角的变化曲线,即可找出满足安全阈值的最优边坡角。最后,采用该方法对兰伯特角铁矿中部矿区上盘边坡角进行了优化,证明了该方法的可行性。
Based on the stability analysis and optimization of slope angle of rock slope in opencast mine, the method of combining finite element reduction strength method with limit equilibrium method is proposed to analyze the stability of open-pit rock slope. The final slope angle is optimized. In this method, the plastic zone inside the slope is first calculated by the finite element reduction strength method, and the plastic zone is assumed to be a potential sliding surface of the slope so that the range of inclination of the sliding surface can be determined. After that, taking this range of slip plane inclination as the starting point of analysis, combined with the theory of limit equilibrium, the slope safety factor under different slope angles was calculated. By plotting the curve of the safety factor with slope angle, we can find out the optimum slope angle to meet the safety threshold. Finally, this method is used to optimize the slope angle of the upper plate of the Lambert Ore Mine, which proves the feasibility of the method.