摘要
为了研究路基内含水率分布规律,确定地下水位、降雨和蒸发作用对路基材料含水率的影响,建立了基于非饱和渗流原理的有限元模型,进行稳态及瞬态的渗流计算,模拟粉质粘土、砂质粘土、亚粘土和亚砂土4种路基及边坡材料含水率的变化规律;通过埋设频域反射仪得到路基含水率年变化规律。研究结果表明:4种路基的含水率均随地下水位的升高呈指数形式上升,持续的降雨和蒸发作用对路基边坡影响深度范围为0.2～0.6m;基于非饱和渗流原理的有限元模型对路基含水率的预估具有较高的精度,能够达到工程应用要求。
In order to study the distribution law of water content in subgrade and determine the impact of groundwater level,rainfall,evaporation factors on the moisture content of subgrade and side slope materials,the finite element model based on unsaturated seepage theory was established.The distribution rule of silty clay,sandy clay,clayey loam and sandy loam water ratio were studied through steady and transient seepage calculating.Annual variation regularity of subgrade water content was obtained through builting frequency domain reflectometer.The results show that the moisture content of subgrade rises exponentially with ground water increases,the deep range of continuous evaporation or rainfall influence on the subgrade slope are from 0.2 to 0.6 m.The finite element model based on unsaturated seepage theory can predict the water content in subgrade accurately and meet the project construction need.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第1期36-40,共5页
Journal of Chang’an University(Natural Science Edition)
基金
交通运输部西部交通建设科技项目(2007 318 000 57)
江苏省高校自然科学研究项目(09KJD560004)
关键词
道路工程
路基
非饱和渗流
含水率
有限元
road engineering
subgrade
unsaturated seepage
water ratio
finite element
