基于强度折减的土质边坡破坏及稳定分析

›› 2006, Vol. 27 ›› Issue (S2): 337-342.

基于强度折减的土质边坡破坏及稳定分析

刘开富¹，谢新宇¹，张继发²，朱向荣¹

1. 浙江大学　岩土工程研究所，杭州 310027；2. 浙江大学　工程与科学计算研究中心, 杭州 310027

收稿日期:2006-10-28 发布日期:2006-12-16
作者简介:刘开富，男，1977生，博士，主要从事地基稳定性数值分析及地基处理技术的研究

Failure and stability analysis of soil slope based on shear strength reduction

LIU Kai-fu¹, XIE Xin-yu¹, ZHANG Ji-fa², ZHU Xiang-rong¹

1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China; 2. Center for Engineering and Scientific Computation, Zhejiang University, Hangzhou 310027, China

Received:2006-10-28 Published:2006-12-16

摘要/Abstract

摘要： 边坡的破坏过程是由土体局部破坏向整体失稳发展的过程，其塑性区的开展及其水平位移增量的变化较完美地展现了这个过程。根据边坡的实际破坏和有限元数值模拟情况，提出了以特征点位移增量的突变及塑性区贯通作为边坡的失稳判断准则；并以此为判据，采用基于强度折减的大变形有限元方法分析了土质边坡的破坏及稳定性。研究表明，采用强度折减有限元法可有效分析边坡的破坏及其稳定性；此外还分析了带有软弱夹层黏土边坡的破坏性状及其稳定性，并比较了大、小变形有限元的计算结果，结果表明，带有软弱夹层黏土边坡的破坏性状随软弱夹层土体性质的变化而变化，由大小变形有限元分析得到的边坡稳定安全系数较为一致，但边坡的破坏机制随软弱夹层土体性质变化的转变点不同。

关键词: 大变形有限元, 土质边坡, 强度折减, 破坏机制, 软弱夹层

Abstract: Failure of soil slope is a developing process from local soil failure to overall failure of slope. And the extension of plastic zone and the change of lateral displacement increment of soil slope exhibit the process perfectly. Based on the actual failure of slope and numerical simulation of finite element method, the abruptness of lateral displacements increment at characteristic location and connectivity of plastic zone are suggested to be the instability criterion of slope. The failure behavior and stability of soil slope is analyzed by using the criterion and large deformation finite element method based on shear strength reduction. Moreover, the failure behavior and the stability of clay slope with weak layer are analyzed and the numerical results of large deformation finite element method are compared with that of small deformation finite element method. The results show that the failure behavior of clay slope with weak layer varied with the soil property of weak layer. And the safety factors of slope stability are coincident relatively, but the changing points of slope failure mechanism varying with soil property of weak layer are different.

Key words: Large deformation finite element, Soil slope, Shear strength reduction, Failure shape, Weak layer

中图分类号:

TU 457

刘开富，谢新宇，张继发，朱向荣，. 基于强度折减的土质边坡破坏及稳定分析[J]. , 2006, 27(S2): 337-342.

LIU Kai-fu , XIE Xin-yu , ZHANG Ji-fa , ZHU Xiang-rong，. Failure and stability analysis of soil slope based on shear strength reduction[J]. , 2006, 27(S2): 337-342.

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