摘要
降雨是滇西土质滑坡灾害的主要诱发因素,而滑坡土体中孔隙水压力的存在使得岩土体的力学性状变得更加复杂.选择滇西红层典型土质滑坡-思铺滑坡做深入的调查,考虑降雨入渗的影响,基于饱和-非饱和渗流理论,选择9月份的降雨量监测资料,对强降雨条件下思铺滑坡地下水动态渗流场进行了数值模拟,将其孔隙水压力结果用于滑坡稳定性分析.同时,又基于非饱和土强度理论,采用GLE通用条分法,对滑坡稳定性的时空效应进行了评价,从而得出降雨入渗与土质滑坡的内在联系:滑坡稳定性与其渗流滞后性有较好的对应关系,最危险滑动面随含水量不同而呈空间的演变.
Rainfall is the important factors that induce landslide hazard in the west of Yunnan province, in fact, it is very difficult to analyze the mechanical behaviors of soil because of the pore water pressure＇s existence. Based on the in-depth investigation, the typical soil slope which called Sipu slope in the west of Yunnan province was chosen. The saturated -unsaturated seepage theory was introduced; numerical simulation on groundwater seepage in Sipu slope under persistent rainfall condition was studied according to the monitoring daily rainfall date in September. The pore water pressure was used for landslide stability analysis, base on unsaturated soil strength theory. The slope stability of space-time effect was evaluated by limit equilibrium method （GLE）. It revealed the inherent relation between rainfall infiltration and soil slope： the stability of landslide show certain correlation with the hysteresis on seepage, and the spatial variability of critical slip surface change with water content.
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2010年第1期55-61,共7页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
中国地质科学院水文地质环境地质研究所基本科研业务专项(sk07025
sk200815)
铁道部科技研究开发计划项目(2008G027-A)
关键词
降雨入渗
土质滑坡
数值模拟
饱和-非饱和渗流
rainfall infiltration
oil slope
numerical simulation
saturated-unsaturated seepage
