非饱和土路基降雨渗流分析  

Analysis of Unsaturated Roadbed Seepage due to Rainfall

作　　者：赵明华[1] 刘小平[1] 何伟[1] 蒋冲[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《公路交通科技》2009年第3期49-53,共5页Journal of Highway and Transportation Research and Development

基　　金：教育部高等学校博士学科点专项基金资助项目(20020532008)

摘　　要：基于路基内部水运动原理,分析了降雨对路基的浸润作用,探讨了IEM和FDEM降雨模型雨水入渗路基机理,推导出降雨作用下雨水入渗路基深度公式;研究了降雨作用下非饱和土路基的饱和-非饱和流,基于一般渗流方程的基础上,初步推出了降雨作用下非饱和土路基的饱和-非饱和渗流公式。结果表明,降雨主要通过雨水对路面裂缝、路堑边坡渗流作用及毛细作用来浸润路基;路基渗流深度受降雨强度、降雨时间、土的吸水率等因素影响;最后,根据提出的公式进行数值模拟,模拟结果与试验对比吻合较好。The soakage effect of rainfall to the roadbed was studied by the movement mechanism of interior water in roadbed. The IEM and FDEM mechanism of roadbed seepage due to rainfall was discussed and the formulae of seepage depth in the roadbed with different rainfall models were derived. In addition, saturated-unsaturated seepage flow in the roadbed was discussed and the formulae of saturated-unsaturated seepage flow were deduced based on the general seepage theory. The result indicates that （ 1 ） the roadbed is soaked by the rainfall in the main way of seepage of roadbed fissure and slope; （2） the depth of seepage is affected by the rainfall intensity, the time of rainfall, the moisture absorption of soil and so on. The result of the numerical simulation according to the formulae is close to the testing result.

关 键 词：道路工程 路基渗流分析 数值模拟 非饱和土路基 降雨模型 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU441.33[建筑科学—岩土工程]