土工基础

›› 2014, Vol. 28 ›› Issue (1): 45-49.

• 工程实录 • 上一篇    下一篇

考虑应力渗流耦合作用下含结构面边坡稳定分析

俞 轩1，何 娜2，仝 帅3   

  1. (1.湘潭大学土木工程与力学学院，湖南 湘潭 411105;2.广东理工职业技术学校，广州 510500;3.广东粤海控股有限公司，广州 510620）
  • 收稿日期:2013-03-07 出版日期:2014-02-20 发布日期:2014-02-27
  • 作者简介:俞轩（1988-），男，硕士研究生，研究方向为土与结构相互作用。

Stability Analysis of Slopes with Weak Planes Coupling with Stress and Seepage Conditions

YU Xuan1， HE Na2, TONG Shuai3   

  1. (1 Department of Civil Engineering and Mechanics, Xiangtan University, Xiangtan Hunan 411105
    2. Guangdong Vocational School of Polytechnic, Guangzhou 510500
    3. Guangdong Yuehai Holdings Ltd, Guangzhou 510620)
  • Received:2013-03-07 Online:2014-02-20 Published:2014-02-27

摘要： 基于非饱和土强度理论与简单条分法，分析了渗流作用下土坡稳定性降低的机理；运用GTS软件通过接触单元考虑结构面，建立应力渗流耦合作用下含结构面土坡稳定分析模型；采用强度折减法与极限平衡法进行渗流边坡稳定分析。结果表明：运用单纯塑性贯通区来判定土坡失稳存在不足之处；数值计算安全系数采用强度折减法与极限平衡法计算结果非常接近，可运用极限平衡法进行安全系数求解；结构面与土中水渗流对边坡的变形、应力和稳定性影响显著，边坡稳定分析要充分考虑结构面和渗流的影响。

关键词: 边坡工程, 结构面, 耦合分析, 稳定性

Abstract: Based on the principles of the unsaturated soil mechanics and circular the slicing method, this paper analyzes the mechanism of the stability reduction under the action of seepage. The weak zones in the slope are simulated with contact elements. The analytical model of soil slopes with weak zones and coupled with stress and seepage is established by using MIDAS GTS software. In the slope stability model, the strength reduction and limit equilibrium methods are considered in the seepage analysis. The results indicate that, the slope instability criterion cannot be purely based on the connection of plastic zones. The results from the numerical analysis with strength reduction method are very similar to those with limit equilibrium approach. The weak planes and seepage have significant impacts on the deformation and stress redistribution as well as stability of slopes.

Key words: slope mitigation, structural surfaces, coupled analysis, slope stability