降雨入渗条件下非饱和土边坡稳定分析.pdfVIP

第26 卷第12 期 岩 土 力 学 Vol.26 No.12 2005 年12 月 Rock and Soil Mechanics Dec. 2005 文章编号：1000－7598 －(2005) 12 ―1957―06 降雨入渗条件下非饱和土边坡稳定分析 徐 晗1 1 1 1, 2 ，朱以文 ，蔡元奇 ，朱方敏 （1. 武汉大学 土木建筑工程学院，武汉 430072 ；2. 广东省水利电力勘测设计研究院，广州 510710 ） 摘 要：针对降雨入渗土坡的稳定问题，建立一个考虑水力渗透系数特征曲线、土-水特征曲线以及修正的 Mohr-Coulomb 破坏准则的非饱和土流固耦合有限元计算模型，进行雨水入渗下非饱和土边坡渗流场和应力场耦合的数值模拟，得到非饱和 土边坡变形与应力的若干重要规律。研究成果为降雨入渗条件下非饱和土边坡的稳定分析提供了基础。 关 键 词：降雨入渗；非饱和土坡；耦合分析；特征曲线；修正的Mohr-Coulomb 准则 中图分类号：TU 431 文献标识码：A Stability analysis of unsaturated soil slopes under rainfall infiltration XU Han1 1 1 1, 2 , ZHU Yi-wen , CAI Yuan-qi , ZHU Fang-min (1. School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China; 2. Guangdong Provincial Investigation Design and Research Institute of Water Conservancy and Electric Power, Guangzhou 510710, China) Abstract: In order to solve the problem of slope stability under rainfall infiltration, this paper presents a flow-deformation coupled finite element analysis model of unsaturated soil which considers hydraulic conductivity curve, soil-water characteristic curve, modified Mohr-Coulomb failure criterion; and the process of infiltration into an unsaturated slope under rainfall and its effect on soil slope behavior are examined using this analysis model. Some important conclusions are drawn after analyzing the stress field and deformation field of unsaturated soil slopes. This paper provides a basis for stability analysis of unsaturated soil slopes under rainfall infiltration. Key words: rainfall infiltration; unsaturated soil slopes; coupled analysis; characteristic curve; mo