基于FLAC3D的顺层岩质边坡稳定性及锚固优化研究

Study of Stability and Anchorage Optimization of Bedding Rock Slope based on FLAC3D

以湖南某泥质粉砂岩顺层边坡为工程背景,通过数值模拟,分析现状边坡稳定性及滑坡趋势;在分析锚固初步设计基础上进行优化,并分析锚杆分布、长度、倾角、间距等对边坡稳定性的影响。结果表明:现状边坡沿坡脚及以上多层结构面发生滑动破坏,滑动面前、中部与结构面重合,后部拉裂岩土体;优化锚固设计,锚杆与岩层夹角为45°~55°对于边坡稳定最有利,锚杆倾角增大,边坡安全系数呈先增加后降低趋势;边坡安全系数与锚杆垂直间距为三次函数关系,存在极值。锚固优化设计可有效提高边坡稳定性,可为类似工程提供参考。

Taking the bedding slope of argillaceous siltstone in Hunan as the engineering background,through the method of numerical simulation,the stability of the present slope and the trend of landslide under natural conditions are analyzed.Based on the analysis of the primary anchor design,the design is optimized and the influence of distribution,length,dip angle,and spacing of anchor arm on slope stability is also analyzed.The result shows that:The current slope slips failure along the toe and above the multilayer structure,the front and middle part of the sliding face coincides with the structural plane,and the rock and soil mass in the back part is cracked';By optimizing anchor design,it is found that the angle in the range of 45~55°between the bolt and rock is most favorable for slope stability and with the increase of anchor dip angle,slope safety factor first increases linearly almost then decreases;The relationship between the slope safety factor and the vertical spacing of the double row anchor is a cubic function,and there is a peak value.The optimal design of anchorage can improve slope stability and provide a reference for similar projects.