非稳定渗流条件下非饱和土边坡稳定分析

›› 2008, Vol. 29 ›› Issue (11): 2892-2898.

非稳定渗流条件下非饱和土边坡稳定分析

于玉贞¹，林鸿州²，李荣建¹，李广信¹

1. 清华大学水沙科学与水利水电工程国家重点实验室（筹），北京 100084；2. 长安大学地质工程与测绘学院，西安 710054

收稿日期:2006-10-17 出版日期:2008-11-10 发布日期:2013-08-07
作者简介:于玉贞，男，1966年生，博士，副教授，所长，主要从事边坡、土石坝稳定分析研究工作

Stability analysis of unsaturated soil slope under transient seepage flow state

YU Yu-zhen¹, LIN Hung-chou², LI Rong-jian¹, LI Guang-xin¹

1. State Key Laboratory of Hydroscience and Hydraulic Engineering, Tsinghua University, Beijing 100084, China; 2. College of Geology Engineering and Geomatics, Chang’ an University, Xi’ an 710054, China

Received:2006-10-17 Online:2008-11-10 Published:2013-08-07

摘要/Abstract

摘要： 大量的滑坡灾害表明, 水的作用是影响边坡失稳的重要原因，合理地评价边坡的稳定性，需考虑边坡基质吸力场的变化与水的渗流作用。通过稳定与非稳定渗流条件下的非饱和土堤算例，探讨了Bishop和Fredlund非饱和土抗剪强度公式应用于强度折减有限元法的差异，并与极限平衡法的结果进行对比。结果表明，Bishop和Fredlund非饱和土抗剪强度公式的本质是相同的，而从非稳定渗流条件下的分析结果来看，强度折减有限元法分析的安全系数与极限平衡法分析临水坡和背水坡安全系数的最小值相当接近，强度折减有限元法更适合分析边坡的整体稳定性。此外，采用Bishop强度公式可以通过用饱和度代替基质吸力参数来体现基质吸力对强度的影响，在分析饱和度较高的非饱和土边坡稳定性时较为方便。

关键词: 强度折减, 有限元法, 极限平衡法, 非稳定流, 非饱和土边坡

Abstract: The effects of hydraulic characteristics play an important role in many landslide hazards; accordingly the variation of matric suction and seepage are considerable factors to evaluate the stability of unsaturated soil slopes. This paper investigates the difference between finite element method with shear strength reduction technique (SSRFEM) and limit equilibrium method (LEM) which are applied to evaluate the stability of unsaturated riverbank in steady and transient seepage flow state. The results show that the effective shear strength equations for saturated soils which are introduced by Bishop and Fredlund are the same in essence. Besides, it is shown that the SSRFEM is more applicable to evaluating global stability of slopes than LEM from the slope stability analysis results in transient seepage flow state. Moreover, the factor of matric suction can be replaced by the relative degree of saturation when the degree of saturation is comparatively high; therefore the approach which is adopted by Bishop can evaluate unsaturated soil slope stability more conveniently, especially in rainfall or water level variation situation.

Key words: shear strength reduction technique, finite element method, limit equilibrium methods, transient flow, unsaturated soil slope

中图分类号:

TU 441

于玉贞，林鸿州，李荣建，李广信 . 非稳定渗流条件下非饱和土边坡稳定分析[J]. , 2008, 29(11): 2892-2898.

YU Yu-zhen , LIN Hung-chou , LI Rong-jian , LI Guang-xin . Stability analysis of unsaturated soil slope under transient seepage flow state[J]. , 2008, 29(11): 2892-2898.

参考文献

相关文章 15

[1]	王翔南, 李全明, 于玉贞, 喻葭临, 吕禾, . 基于扩展有限元法对土体滑坡破坏过程的模拟[J]. 岩土力学, 2019, 40(6): 2435-2442.
[2]	李书兆, 王忠畅, 贾旭, 贺林林, . 软黏土中张紧式吸力锚循环承载力简化计算方法[J]. 岩土力学, 2019, 40(5): 1704-1712.
[3]	王珍, 曹兰柱, 王东, . 非均质边坡稳定性上限分析评价研究[J]. 岩土力学, 2019, 40(2): 737-742.
[4]	郑安兴, 罗先启, 陈振华, . 基于扩展有限元法的岩体水力劈裂耦合模型[J]. 岩土力学, 2019, 40(2): 799-808.
[5]	郑安兴，罗先启，. 危岩水力劈裂分析的扩展有限元法[J]. , 2018, 39(9): 3461-3468.
[6]	宋佳，古泉，许成顺，杜修力，. 饱和土动力方程全显式有限元法在 OpenSees中的实现与应用[J]. , 2018, 39(9): 3477-3485.
[7]	宋佳，杜修力，许成顺，孙宝印，. 饱和土场地-桩基-地上结构体系的地震响应研究[J]. , 2018, 39(8): 3061-3070.
[8]	闫澍旺，李嘉，闫玥，陈浩，. 黏性土地基中竖向圆孔的极限稳定深度研究[J]. , 2018, 39(4): 1176-1181.
[9]	李宁，郭双枫，姚显春,. 再论岩质高边坡稳定性分析方法[J]. , 2018, 39(2): 397-406.
[10]	罗先启，郑安兴,. 岩体裂隙模拟的扩展有限元法应用研究[J]. , 2018, 39(2): 728-734.
[11]	刘忠玉, 张家超, 郑占垒, 关聪. 考虑Hansbo渗流的二维Biot固结有限元分析[J]. 岩土力学, 2018, 39(12): 4617-4626.
[12]	刘振平，杜根明，蔡洁，周凡，刘建，卞康，. 基于MeshPy的3DGIS与三维有限元数值计算无缝耦合方法[J]. , 2018, 39(10): 3841-3852.
[13]	涂义亮，刘新荣，钟祖良，杜立兵，王鹏, . 三类边坡失稳判据的统一性[J]. , 2018, 39(1): 173-180.
[14]	朱彦鹏，杨晓宇，马孝瑞，杨校辉，叶帅华, . 边坡稳定性分析双折减法的几个问题[J]. , 2018, 39(1): 331-338.
[15]	邹德高，刘锁，陈楷，孔宪京，余翔,. 基于四叉树网格和多边形比例边界有限元方法的岩土工程地震响应非线性静动力分析[J]. , 2017, 38(S2): 33-40.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed