地下水在引发边坡病害中的作用  

The effect of the groundwater on slope instability

作　　者：徐世光[1] 王明珠 王云晓[3] 李长才 王小晶 喻江[4] 

机构地区：[1]云南地矿勘查工程总公司(集团) [2]云南地质工程勘察设计研究院,昆明650041 [3]云南省国土资源厅,昆明650051 [4]云南岩土工程勘察设计研究院

出　　处：《水文地质工程地质》2006年第5期46-51,共6页Hydrogeology & Engineering Geology

基　　金：云南省技术创新基金课题<云南元磨公路边坡变形破坏机制及防治对策研究>(2002PY02)

摘　　要：人们普遍认为由于地下水的浸泡降低滑带土的抗剪强度值是导致边坡失稳的内部机制。文章以云南元磨公路边坡为实例,对其进行了探究,发现病害边坡主要滑带土的天然含水量与其剪切试验所得的内聚力和内摩擦角之间并没有明显的线性关系。于是,文章采用极限平衡方程从理论上论述了地下水在边坡失稳过程中的力学作用,并对比边坡开挖前后入渗系数值的变化幅度,揭示出工程活动与降雨共同对边坡破坏的作用机制。Abstract： It is accepted widely that the effect of groundwater, which decreases the shearing strength of the sliding layer through marinating, is the inner mechanism that leads to slide of slopes. Based on the domestic famous case study of slopes along the Yuan-Mo highway in Yunnan, a different result is obtained that there exists no obvious lin- ear relationship between the measured cohesion and the inner frictional angle of the slide soil on the destructive slope and its natural water content. Furthermore, the mechanics of the groundwater effect on the course of the slope slide is discussed by employing the critical destructive model theoretically, and the destructive mechanism of the slopes, which are driven chiefly by engineering activity and rainfall, is recognized more clearly through comparing the mea- sured seeping coefficient of the rainfall that is in natural state and after excavating.

关 键 词：边坡 地下水作用 极限平衡模型 降水入渗系数 

分 类 号：P642.21[天文地球—工程地质学] TU459.2[天文地球—地质矿产勘探]