露天矿最终边坡角优化设计模拟分析

Simulation Analysis of the Final Sloping Angle Design and Optimization on the Open-pit Mine

为了确定合理的露天矿最优边坡角,结合工程经验建立了基于数值模拟的边坡优化循环流程图,该流程图使得边坡的优化设计显得清晰、直观。在工程勘察与岩体试验的基础上,采用三维显式有限差分程序FLAC3D,对矿山在不同开挖边坡角下的位移及塑性区等反应边坡稳定性的多种指标进行对比分析,确定了最终边坡角并以此模拟出边坡潜在滑动面位置;然后,利用国际通行软件Slide对边坡设计方案进行稳定性验算并求得边坡稳定性系数。通过某一露天矿实例证明了该方法是一种切实、有效的边坡优化方法。

In order to gain the optimal sloping angle of the open-pit mine, combined with the engineering experiences, a slope optimization cycle flow chart based on the numerical simulation is established which makes the optimization design of the slope more clear and direct. After the geotechnical investigation and rock mass tests, three dimensional explicit finite difference program FLAC3D is used to analyze various indexes which response of slope stability of the mine, including the displacement and the plastic zone under different slope angle of the mine, to determine the final sloping angle finally and find out the location of the potential slide surface. Then, the stability checking of design proposal is made and the slope sta- bility factors are gained by the international prevailing software Slide. The case in an open pit proves that the method above is practical and effective for the slope optimization.