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为了研究黄土-基岩不整合面深路堑边坡的稳定性,文章以兰州北绕城高速公路盐场堡至什川连接段为工程依托,运用简化的毕肖普法并结合理正岩土软件对路段8个典型横断面进行了边坡滑动安全系数计算,而后对该类型边坡进行了稳定性分析、评价,发现深路堑黄土-基岩混合边坡在现有综合坡率和台阶宽度条件下,开挖后的边坡在3种工况条件下均能满足稳定性要求,而产生的圆弧形滑裂面则发生在上覆黄土土体当中,剪出口位于黄土与基岩的不整合面处。文章最后针对该类型深路堑边坡提出了相应的设计与防治方案,为工程的顺利实施提供了参考依据。
In order to study the stability of the deep-cut slope of the loess-bedrock unconformity surface, the article relies on the connection of the Yanfubao-Shichuan section of North Ring Expressway in Lanzhou. By using the simplified Bishop method and the software of Lizheng geotechnical engineering, 8 typical cross-sections were used to calculate the sliding safety factor of the slope, and then the stability analysis and evaluation of this type of slope were carried out. It was found that under the existing comprehensive slope rate and step width, The excavated slope can meet the stability requirements under all three conditions, but the circular arc-shaped slip surface occurs in the overlying loess soil and the shear outlet is located on the unconformity surface between loess and bedrock Department. Finally, the article puts forward the corresponding design and control scheme for this type of deep cutting slope, which provides a reference for the smooth implementation of the project.