基于非饱和土理论的降雨入渗路基稳定性分析  

Analysis of Roadbed Stability after Rain Seepage Based on Unsaturated Soil Theory

作　　者：刘兴旺[1] 戴源夏 

机构地区：[1]云南省设计院,昆明650032

出　　处：《公路交通技术》2009年第3期1-3,7,共4页Technology of Highway and Transport

基　　金：湖南省科技厅科技开发项目(04SK2009)

摘　　要：采用非饱和土强度理论和极限平衡法,得出考虑降雨入渗渗流力作用下的路基稳定性计算公式。把一定降雨强度和降雨持续时间下的路基稳定性转化为对应入渗深度内的渗流力作用下的路基稳定性。通过渗流力把入渗深度引入安全系数的计算公式,并通过安全系数对入渗深度求导,分析入渗深度对路基稳定性的影响及其原因。最后通过具体算例,讨论降雨对路基稳定性的影响。Based on the unsaturated soil strength theory and limit equilibrium method, this paper obtains the calculating formulae for the roadbed stability under the effect of seepage force of rain. The roadbed stability under definite strength and duration of rain is transformed into the roadbed stability under the seepage force in eorresponding seepage depth. The influences of the seepage depth on the roadbed stability and eanses are analyzed by introducing the seepage depth into the ealeulating formulae for safety coefficient and deriving the seepage depth dependent on the safety coefficient. Finally the influences of rain on roadbed stability are discussed via the specific calculation examples.

关 键 词：降雨入渗 非饱和土 路基稳定性 安全系数 

分 类 号：U416.1[交通运输工程—道路与铁道工程]