降雨条件下厚覆盖层边坡的渗流特性  

Seepage characteristics of thick coating slope in raining condition

作　　者：蒋中明[1] 曾铃[2] 付宏渊[2] 何忠明[3] 

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410004 [2]长沙理工大学土木与建筑学院,湖南长沙410004 [3]长沙理工大学交通运输工程学院,湖南长沙410004

出　　处：《中南大学学报（自然科学版）》2012年第7期2782-2788,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51078042);湖南省交通科技计划项目(2009003)

摘　　要：基于实际降雨资料及饱和-非饱和渗流理论,对算例边坡在设计降雨方案条件下的孔隙水压力变化、体积含水率以及暂态饱和区的发展与消散进行时间和空间上的研究。研究结果表明:在降雨过程中边坡表层一定深度内,孔隙水压力逐渐增大,降雨停止后,孔隙水压力缓慢降低;边坡表层体积含水率随着降雨时间的持续逐渐达到饱和含水率,并保持不变;当降雨停止后,体积含水率才开始沿着坡面向下逐渐降低;暂态饱和区是在边坡表层土体达到饱和并形成连通区域后产生的,滞后于孔隙水压力和体积含水率的增大;暂态饱和区在形成的空间顺序上表现为先坡脚及各级台阶处,后边坡坡面,而消散顺序刚好相反。On the basis of in-situ rainfall information and saturation-unsaturation seepage theory, the pore water pressure and volumetric water content and transient saturated zone variation of the specific slope within the condition of designed rainfall were researched spatially and timely. The results show that the pore water pressure of slope on the surface within a certain depth increases at rainfall, and decreases when the rainfall is over. The volumetric water content of slope surface increases to saturated water content with the increase of rainfall, and is kept when the rainfall is over, and it begins to decrease along the slope surface. The formation of transient saturated zone occurs when the soil of slope surface is saturated and the saturated zones are connected, but it comes after the increase of pore water pressure and volumetric water content. The transient saturated zone occurs first at the slope foot and stages, then at the back of slope surface. The dissipation of transient saturated zone is the opposite.

关 键 词：厚覆盖层边坡 孔隙水压力 体积含水率 暂态饱和区 

分 类 号：TU441[建筑科学—岩土工程]