土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (3): 428-432.

• 专题论述 • 上一篇    下一篇

基于动态双参数强度折减的边坡稳定性分析方法探讨

张志卫，朱浩锋，陈小巍   

  1. （湖南省水文地质环境地质调查监测所,湖南株洲 412008）
  • 收稿日期:2023-05-24 修回日期:2023-06-18 出版日期:2025-06-30 发布日期:2025-08-05
  • 作者简介:张志卫（1982-），男，硕士，高级工程师，研究方向为水工与环境地质。
  • 基金资助:
    湖南省自然科学基金项目(No. 2020JJ6080)；湖南省水文地质环境地质调查监测所科研项目（2022）

Slope Stability Analysis with Dynamic Double Factors Strength Reduction Method

ZHANG Zhiwei, ZHU Haofeng, CHENG Xiaowei   

  1. (Survey and Monitoring Institute of Hydrogeology and Environmental Geology, Zhuzhou 412008)
  • Received:2023-05-24 Revised:2023-06-18 Online:2025-06-30 Published:2025-08-05

摘要： 强度折减系数比值取值是采用双参数强度折减法确定边坡安全系数的关键问题。在考虑土体内摩擦角c与黏聚力φ弱化不同步现象的基础上，通过理论推导，得到了强度折减系数Fφ/Fc比值动态比例关系，并基于强度折减的最短路径来定义边坡综合安全系数定义和最小取值原理，提出了一种动态双参数强度折减边坡稳定性分析方法。研究表明:当tanφ=0或c=0时，边坡安全系数曲线均表现出非线性变化特点，并可以采用多项式进行拟合，拟合度达到0.99以上；从c-Fφ/Fc曲线表明土体粘聚力c的弱化使Fφ/Fc比值在1.02-1.09之间变化，证实了边坡稳定性分析时采用动态强度折减的合理性；相比现有的单参数和双参数法，动态双参数强度折减法Fφ/Fc比值取值方法简单，且比值动态变化，所得到的边坡安全系数相比现有单参数与双参数折减法都要稍小，结果更为安全与合理。

关键词: 边坡稳定性分析, 动态双参数强度折减法, 安全系数, 抗剪强度弱化

Abstract: The value of strength reduction ratio is a key issue in the slope stability analysis by using double factors strength reduction technique (DDRM). By considering the nonsynchronous shear strength deterioration of the internal friction angle φ and the cohesive strength c, the dynamic proportional relation of the strength reduction factor Fφ/Fc is proposed in this paper. Moreover, based on a comprehensive factor of safety by the shortest path method of the strength reduction technique and the minimum value principle of the slope factor of safety, this paper presents a slope stability analysis method by the DDRM. The results indicate that the slope safety curves which can be fitted well by the polymerization with above 0.99 fit degree show an obvious nonlinear characteristic. The curve of the c-Fφ/Fc indicates that the strength reduction factor ratio Fφ/Fc  is varied between 1.02 and 1.09 which verify the rationality of the DDRM. Comparing with the traditional single factor (SRM) and the double factors strength reduction technique (DRM), the value of the strength reduction factors Fφ/Fc is simpler and the dynamically changes by the DDRM proposed in this paper. So, the smaller slope factor of safety by the DDRM makes the slope safer and the factor of safety is more reasonable than by using both the SRM and the DRM.

中图分类号: