缓倾角顺层滑坡失稳机制及加固措施研究

Research on Instability Mechanism and Reinforcement Measure of a Low-angle Rock Bedding Landslide

本文通过某缓倾角顺层岩质滑坡实例,分析了该滑坡的变形破坏特征,并通过建立FLAC3D数值模型研究滑坡产生的原因、失稳机制和松弛区影响范围,结果表明:1.滑坡破坏模式属于张拉-剪切复合破坏,基于张拉-剪切复合破坏准则对岩质边坡进行稳定性分析更符合实际。2.FLAC3D数值计算能确定边坡开挖产生的松弛区影响范围,结合极限平衡法可用于分析该类型边坡的稳定性。3.此类工程采用预应力锚索对滑坡进行加固处理能够较好地控制滑坡位移,施工阶段对滑坡的扰动也较小,安全性较高,同时能够降低工程造价,较经济。

Based on a practical case of a low-angle rock bedding landslide,deformation and failure characteristics of the bedding landslide are analysed.At the same time,the causes of occurrence and instability mechanism and relaxation region are researched with numerical calculation model established on FLAC^3D. The results show that： l.The failure mode of the landslide is composed of both tension and shear failure.It is practical to analysis stability of rock slope by using tension-shear composite failure criterion; 2.The relaxation region of the slope caused by excavating can be confirmed with numerical calculation results of FLAC^3D.The numerical calculation method can be used in analysing stability of the slope combined with equilibrium method. YThe displacement of the landslide can be effectively controled using prestressed cable. The reinforcement measure is safely because it can reduce disturbance of the landslide when construction. At the same time,The reinforcement measure can reduce construction cost and it is economical.