露天煤矿压帮内排端帮稳定性变化规律研究
Study on Slope Stability Change Law of Inner Dump Covering End-slope in Open-pit Coal Mine
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摘要: 通过理论分析结合数值模拟的手段,对国内某露天煤矿端帮靠帮开采结束后逐步进行内排压帮这一过程进行了边坡稳定性分析。首先从二维角度建立了内排压帮的理论模型,同时推导出了内排压帮后边坡安全系数的计算公式,阐述了这一过程中边坡安全性提高的机理。然后使用FLAC3D数值模拟软件对端帮靠帮结束后未进行内排的状态进行了稳定性分析,同时将内排压帮过程分成3个阶段进行了稳定性分析。根据模拟结果发现内排的跟进明显的减小了端帮岩体的剪切应变增量,同时岩体的变形范围和变形量也明显缩小。压帮内排能够使边坡安全性得到有效的提升。而且内排工作的前期,对端帮稳定性的增加效果最为明显。Abstract: This paper analyzes the slope stability of inner dump covering end-slope after the end-slope mining of a domestic open-pit coal mine by means of theoretical analysis and numerical simulation. Firstly, the theoretical model of inner dump covering end-slope is established from two-dimensional view point. At the same time, the calculation formula of slope safety factor after inner dump covering end-slope is given, and the mechanism of slope safety improvement in this process is expounded. Then the numerical analysis software FLAC3D is used to analyze the stability of the end-slope without inner dump after the end-slope mining, and the process of inner dump covering end-slope is divided into three stages. According to the simulation results, the follow-up of the inner dump obviously reduces the shear strain increment of end-slope rock, and the deformation range and amount of rock also obviously reduce. Therefore, the inner dump can effectively improve the slope safety. Especially, in the early stage of the inner discharge work, the effect of increasing the stability of the end-slope is the best.
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Keywords:
- open-pit mine /
- inner dump /
- numerical simulation /
- slope stability /
- timeliness slope
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