土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (1): 50-52.

• • 上一篇    下一篇

滑带土抗剪强度指标确定的数值计算方法

苏美选1，林智勇2   

  1. （1.福建中天电力咨询有限公司，福州 350001；2.福建工程学院岩土工程研究所，福州 350108）
  • 收稿日期:2019-04-04 修回日期:2019-05-09 出版日期:2020-04-20 发布日期:2020-04-20
  • 作者简介:苏美选（1981-），女，工程师，研究方向为岩土体稳定性分析、岩土工程勘察、设计等。
  • 基金资助:
    福建省中青年教育科研项目（AJT170886）；福建省自然科学基金（2018J01626）

Numerical Method for the Determination of Shear Strength Parameters of the Slip Zone

SU Meixuan1, LIN Zhiyong2   

  1. (1.Fujian Zhongtian Electric Power Consulting Co.,Ltd, Fuzhou 350001;
    2.Institute of Geotechnical Engineering, Fujian University of Technology, Fuzhou 350118)
  • Received:2019-04-04 Revised:2019-05-09 Online:2020-04-20 Published:2020-04-20

摘要： 介绍了滑带土反算法的基本原理，采用有限差分法平面应变模型，对某一处于临界稳定状态公路边坡的抗剪强度指标进行反算，分别取与滑坡主轴距离相等的两断面，先假定其中一抗剪强度指标c（或φ）已知，反复试算和调整另一指标φ（或c），直到程序计算所得安全系数K＝1为止，得到一组相对应的抗剪强度指标，按相同方法重复试算几次，得到相对应的c、φ值，然后把两断面的数据绘在同一坐标系中，其交点即为该坡体的抗剪强度指标。分析表明，采用数值模拟反算法计算滑带土的抗剪强度指标是可行的。

关键词: 滑带土, 抗剪强度, 数值计算, 反算法

Abstract: In this paper, the basic principles of the numerical back analysis of slip zone soil properties are introduced. The finite difference plane strain model is used to back predict the shear strength parameters of a highway slope in the critical stability conditions. Two sections with the same distance from the main axis of the landslide are taken respectively. First, one set of the shear strength parameters c (or φ) is assumed, and the other set of parameters φ (or c) is repeatedly tested and adjusted until the numerical analysis reaches critical state. At the critical condition, factor of safety K=1 is assumed, a set of corresponding shear strength parameters is obtained. Several groups of corresponding c and φ values are analyzed repeatedly using the same method. Then the data of two sections are plotted in the same coordinate system, and the intersection point is the shear strength parameters of the slope. The results show that it is feasible to estimate the shear strength parameters in the sliding zone soil by the back analysis using the numerical simulation method.

Key words: SoilSliding Zone, Shear Strength, Numerical Simulation, Back Analysis

中图分类号: