土壤含水量减少对提高浅表层滑坡稳定性的影响  

Impacts of Decrease of Soil Moisture Content on Stability of Shallow and Surface Landslide

作　　者：杨永红[1] 刘淑珍[2] 王成华[2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家专业实验室,成都610059 [2]中国科学院成都山地灾害与环境研究所,成都610041

出　　处：《水土保持研究》2007年第5期261-263,共3页Research of Soil and Water Conservation

基　　金：重大基础项目前期研究(2004CCA03600)

摘　　要：通过对裸地和桉树林地两种土壤在不同土壤含水量、不同深度的非饱和土的直剪试验,研究了含水量变化对提高边坡稳定性的影响。结果表明,随着含水量的增加,非饱和土的黏聚力和内摩擦角均减小,黏聚力有较大变化而内摩擦角变化较小;植被水文作用能有效的减少土壤含水量,具有提高非饱和土抗剪强度的作用,从而能提高边坡稳定性和防治坡面水土流失。It is analyzed that the impacts of soil moisture content on stability of landslide through direct shearing tests tor unsaturated soil of various vegetation types of bare land and eucalyptus land, different soil moisture contents and different-depth unsat- urated soil. The results show that the cohesion of unsaturated soil changes greatly,and the friction angle changes a little with soil moisture content. It is also shown that vegetation hydrological action can decrease soil moisture content, improve shear strength of unsaturated soil,which therefore provides a basis that vegetation can improve stability of landslide, prevention and control of soil and water loss on slopes.

关 键 词：含水量 非饱和土 抗剪强度 植被护坡 

分 类 号：P642.22[天文地球—工程地质学]