摘要
针对现行的高填土质路堤边坡,基于饱和—非饱和渗流数学模型,设计了二维非稳定渗流程序,通过模拟因雨水入渗引起的暂态渗流场,分析土体中含水量、基质吸力的变化规律;采用等效粘聚力的概念,利用延伸的MOHR COULOMB破坏准则对路堤边坡进行了弹塑性有限元分析,进而得出路堤边坡在不同降雨时刻的安全系数;最后分析了降雨重现期、土参数φb和由路堤施工所引起的土体渗水性系数的各向异性对边坡渗流稳定的影响。
A two-dimension unsteady seepage FEM program is developed on the basis of unsaturated seepage pattern to simulate transient seepage fields due to rainfall infiltration for popular high road fills. The water content and matric suction in the slope are analyzed. An extended MOHR-COULOMB failure criterion is used to allow for shear strength variations as a result of changes in matric suction, thus the safety factors are calculated. In addition, effects of various rainfall events, angle φ~b and the anisotropic permeability ratio caused by construction of the embankment on the seepage stability are analyzed.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2004年第4期25-30,共6页
China Journal of Highway and Transport
关键词
道路工程
高填土路堤
渗流模型
边坡稳定
降雨入渗
非饱和土
暂态渗流
road engineering
high-filled embankment
seepage model
slope stability
rainfall infiltration
unsaturated soil
transient seepage
