开挖卸荷情况下露天矿边坡变形特征
Deformation characteristics of open-pit slope affected by excavation loading
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摘要: 针对开挖卸荷情况下露天矿边坡的稳定性问题,采用数值模拟和理论分析方法研究了开挖卸荷情况下边坡的变形特征,提出了一种实用的边坡稳定性快速识别方法。以黑岱沟露天矿首采区南端帮沿帮排土场边坡为例,采用有限元数值模拟方法分析端帮分步开挖情况下典型剖面的应力特征和变形特征,总结了边坡变形在时间和空间2个维度上的特点;从理论上分析了开挖卸荷情况下露天矿边坡变形的累积效应和边坡失稳破坏时变形不再有序增长的原理;对比监测结果和安全系数计算结果,相关结论和方法适用于工程实际。Abstract: Deformation characteristics of open-pit slope affected by excavation loading Aiming at the stability of open pit slope under excavation unloading, the deformation characteristics of slope under excavation unloading are studied by numerical simulation and theoretical analysis method, and a practical fast identification method of slope stability is proposed. Taking the slope of the dump along the south end slope of the first mining area of Heidaigou Open-pit Mine as an example, the stress and deformation characteristics of typical section under the condition of step excavation of the end slope are analyzed by finite element numerical simulation method, and the characteristics of slope deformation in time and space are summarized. The open-pit side under the condition of excavation and unloading is analyzed theoretically. The cumulative effect of slope deformation and the principle that the deformation does not increase orderly when the slope is destroyed by instability are compared with the results of monitoring and safety factor calculation, which shows that the relevant conclusions and methods are applicable to engineering practice.
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