降雨过程中边坡临界滑动场.pdf

第 34 卷增刊 1 岩 土 力 学 Vol.34 Supp.1 2013 年 8 月 Rock and Soil Mechanics Aug. 2013 文章编号：1000 －7598 －(2013) 增 1－0060 －07 (1. 合肥工业大学 土木与水利工程学院，合肥 230009 ； 2. 合肥工业大学 安徽省土木工程与材料省级重点实验室，合肥 230009) 摘 要：降雨入渗过程中孔隙水压力的升高与基质吸力的降低引起边坡稳定性的下降，是导致边坡滑塌的主要诱导因素。利 用饱和-非饱和渗流有限元计算得到的孔隙水压力场，基于 Fredlund 提出的非饱和土抗剪强度理论，对边坡临界滑动场进行 改进，提出可以考虑降雨过程的边坡临界滑动场数值模拟方法，能够方便、快速地计算出边坡局部、整体安全系数和相对应 的临界滑动面在降雨过程中的变化历程。将该法用于一个典型均质边坡和一个非均质边坡在降雨过程中的稳定性计算，分析 降雨持续时间、降雨强度和非饱和强度参数取值等因素对边坡稳定性的影响，并将计算结果与其他方法进行比较，结果表明 临界滑动场方法能搜索任意形状最危险滑面，计算的安全系数合理。 关 键 词：临界滑动场，边坡稳定性，降雨入渗，饱和-非饱和渗流，有限元 中图分类号：TB 115 文献标识码：A Critical slip field of slope in process of rainfall infiltration SHEN Yin-bin1, 2，ZHU Da-yong1, 2，JIANG Ze-feng1, 2，YAO Ha-yan1, 2 (1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009,.China; 2. Anhui Provincial Key Laboratory of Civil Engineering and Materials, Hefei 230009, China ） Abstract: The rising of pore water pressure and decreasing of matric suction in the process of rainfall infiltration into slope is the main factor of slope failures .Numerical simulation method of critical slip field of slope considering rainfall process is proposed based on proposed unsaturated soil shear strength theory and water pressure field obtained by finite element analysis of saturated-unsaturated seepage. Thus, slope local safety factor and slope whole safety factor as well as the corresponding critical slip surfaces during infiltration are calculated conveniently and rapidly. This method has been applied to the stability analysis of two examp