露天矿边坡开挖卸荷与孔隙水压力消散诱发地表沉降规律研究

Research on the laws of surface settlement caused by excavation and pore water pressure dissipation in open-pit mine slopes

本文通过理论分析结合数值模拟的方法对露天矿边坡因开挖卸荷与孔隙水压力消散诱发的地表沉降进行了计算分析,获得了两种因素共同影响下的露天矿边坡坡顶的沉降规律。发现开挖卸荷诱发的露天矿边坡沉降较为均匀,孔隙水压力消散则更容易诱发露天矿边坡的不均匀沉降。通过对理论模型计算结果、数值模拟结果及现场施工过程中的监测结果进行对比发现,计算结果与实际监测结果在沉降趋势及沉降量上均具有较好的一致性。研究成果对推动露天矿边坡沉降理论和数值模拟的实践应用有一定的参考价值。

In this paper,the surface settlement caused by excavationand pore water pressure dissipation of open-pit slope is calculated and analyzed by theoretical analysis and numerical simulation,and the subsidence rule of open-pit slope top under the influence of both factors is obtained.It is found that the slope subsidence caused by excavation and unloading is more uniform,and the pore water pressure dissipation is more likely to induce the uneven settlement of the open-pit slope.By comparing the calculation results of theoretical model,numerical simulation and monitoring results in the process of site construction,it is found that the calculation results are in good agreement with the actual monitoring results in settlement trend and settlement amount.The research results have a certain reference value for promoting the practical application of slope settlement theory and numerical simulation in open pit mine.