文档介绍：第 28 卷第 5 期岩土力学
2007 年 5 月 Rock and Soil Mechanics May 2007
文章编号:1000-7598-(2007) 05-0965-06

非饱和渗流对滑坡稳定性的影响研究
章广成,唐辉明,胡斌
(中国地质大学(武汉),武汉 430074)

摘要:库水位下降对滑坡的稳定性具有较大影响。提出了土水特征曲线的多项式约束优化模型和一种新的溢出面边界条件
约束函数,并用 ANSYS 的 APDL 语言编制了饱和-非饱和渗流程序。以赵树岭滑坡为例,首先利用核磁共振(NMR)技术
和钻孔资料建立该滑坡的物理模型,然后模拟了长江水位以不同速度从 175 m 下降到 145 m 时该滑坡的渗流场,对每种工况
不同时刻的滑坡稳定性进行了计算。实例分析结果表明,库水位下降过程中稳定性系数会出现极小值,库水位下降速度越大,
稳定性系数极小值越小,出现极小值的时刻也越早。
关键词:饱和-非饱和渗流;基质吸力;土水特征曲线;ANSYS;APDL
中图分类号:TV 233 文献标识码:A

Study of influence of unsaturated seepage on stability of landslide

ZHANG Guang-cheng, TANG Hui-ming, HU Bin
(China University of Geosciences, Wuhan 430074, China)

Abstract: The stability of landslide is affected by the drawdown of reservoir water level. A polynomial constrained optimized model
for soil-water characteristic curve and a new restrict function for overflow surface are put forward. Based on these, a
saturated-unsaturated seepage program is edited with APDL in ANSYS. Zhaoshuling Landslide is taken as an example, firstly the
physical model is established through Nuclear ic Resonance and bore data,and then the seepage fields are simulated when the
Yangtze River water level falls from 175 m to 145 m at different speeds, the stability of the landslide at different times is also
analyzed. The result shows that the bigger the fall speed is, the lea