降雨条件下不同土质非饱和路基边坡响应特性  

Field Trial for Characteristics of Matrix Suction and Infiltration of Slope of Unsaturated Subgrade Under Artificial Rainfall

作　　者：王协群[1] 谢妮[2] 邹维列[2,3] 骆以道 刘卫 

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]武汉大学土木建筑工程学院,武汉430072 [3]岩土与结构工程安全湖北省重点实验室,武汉430073 [4]深圳市勘察测绘院有限公司,深圳518028 [5]山西省公路局晋中分局,晋中310043

出　　处：《武汉理工大学学报》2010年第8期107-110,共4页Journal of Wuhan University of Technology

基　　金：交通部西部交通建设科技攻关重点项目(200531874010)

摘　　要：通过对我国西部2种典型非饱和路基边坡实施现场人工降雨的监测结果表明,随着各次降雨的依次进行,非饱和路基边坡初始含水量逐渐增大,入渗率逐渐减小;非饱和黄土路基边坡的初始含水量状态对应着一个临界降雨量,只有降雨量超过该临界值,边坡才有可能产生径流。降雨强度越大,从降雨开始到径流产生所需的间隔时间越短;非饱和黄土路基边坡的吸力值远大于非饱和土石混合土路基边坡。在试验条件下,压实黄土路基边坡的降雨入渗影响深度在0.3~0.6 m之间,而土石混合土路基边坡降雨入渗影响深度在2.4 m以上。Two artificial rainfall stimulation trials were conducted at a slope of subgrade filled with loess in Gansu Province and a slope of subgrade filled with soil containing stone in Chongqing City,China,respectively.The test results indicated that as each spell of rainfall go on,the ratio of infiltration of rainwater for slope of unsaturated subgrade decrease gradually owing to the increasing of water content of slope soil,namely,the decreasing of capacity of moistureabsorbing of which.It seemed there was a corresponding critical rainfall for unsaturated loess subgrade being in a original water content,only if practical rainfall exceed the critical rainfall,runoff probably occur,and the greater the rainfall density,the shorter the period from beginning of rainfall to occurring of runoff.The matrix suction of slope of subgrade filled with loess far exceed that of slope of subgrade filled with soil containing stone.The permeability of compacted loess was very small.For the slope of subgrade filled with soil containing weathering shale and mudstone with fracture,which provided the passageway for the infiltration of rainfall,the influence depths of rainfall infiltration far exceeded those of the slope of subgrade filled with loess,and under this field trial circumstance,the influence depths of rainfall infiltration for the former were 0.3～0.6 m,but those for the latter exceeded 2.4 m.

关 键 词：非饱和土 路基边坡 黄土 土石混合土 降雨入渗 吸力 

分 类 号：TU443[建筑科学—岩土工程]