土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (2): 144-147.

• 工程实录 • 上一篇    下一篇

抗滑桩加固路堑边坡的稳定性分析

马 宁   

  1. （贵州有色地质工程勘察公司，贵阳 550005）
  • 收稿日期:2021-01-20 修回日期:2021-01-26 出版日期:2021-04-23 发布日期:2021-04-23
  • 作者简介:马 宁（1982-），男，高级工程师，研究方向为水文地质、工程地质与环境地质。

Stability Analysis of Cut Slope Improved by Anti-Sliding Caissons

MA Ning   

  1. (Guizhou Nonferrous Geological Engineering Reconnaissance Co. Ltd., Guiyang 550005)
  • Received:2021-01-20 Revised:2021-01-26 Online:2021-04-23 Published:2021-04-23

摘要： 针对贵州的高路堑边坡特点，在进行规范方法计算的同时，应用有限元数值模拟计算在抗滑桩加固下的边坡稳定性系数，并且对结果进行分析和优化处理。数值模拟结果表明：当采用桩+连墙的支护组合结构时，加固过程中边坡内部潜在滑动面首先沿土层分界面进行扩展，随着折减参数增大，坡体后缘位移最大，潜在滑面在强呈圆弧状分布。边坡安全系数1.1～1.2，此时坡体具有较高稳定性，并且支护结构的位移较小，处在规范要求区间内；抗滑桩有效长度约29 m，此时锚固深度19 m，当桩长19 m时，锚固深度7 m时，桩身易出现旋转倾斜，应增加锚固长度或采用锚索等加固措施。

关键词: 稳定性分析, 抗滑桩, 锚固长度, 桩间距

Abstract: A typical cut slope stabilized by antislide caisson in Guizhou was analyzed by both the code method and the finite element methods for the factor of safety of the slope. The numerical analysis results indicate that, when the cut slope is stabilized by the caisson and the retaining wall, the potential sliding plane is first developed in soil zone. With the increase of strength reduction, the deformation at the top of slope increases, and a circular sliding surface can be observed. When the factory of safety of the improved slope is between 1.1 and 1.2, the improved slope is stable and the deflection in the caisson is small and meets the code requirements. When the effective length of the anti-slide caisson is 29 meters, the anchoring depth is 19 meters. When the caisson length is 19 meters with anchoring depth is 7 meters, rotational tilting of the caisson is observed so that the ground anchor should be used in the caisson system.

Key words: stability analysis, antislide caisson, anchorage depth, spacing of caissons

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