黄土高路堤三维固结数值解法  

3-D consolidation numerical calculation of loess-high embankment

作　　者：景宏君[1] 胡长顺[2] 王秉纲[2] 丁宁 李跃才 

机构地区：[1]西安交通大学航天航空学院 [2]长安大学公路学院,陕西西安710064 [3]陕西省榆林市地方公路管理处,陕西榆林719000 [4]陕西省成通机械化公路工程有限责任公司,陕西西安710068

出　　处：《交通运输工程学报》2007年第2期59-64,共6页Journal of Traffic and Transportation Engineering

基　　金：国家西部交通建设科技项目(200131800018)

摘　　要：针对黄土的结构性、欠压密性、非饱和性与各向异性特点，将黄土视为非饱和土，基于非饱和土力学理论，建立了相应的三维固结方程组，利用有限元法，分析了黄土的固结变形特征。分析发现黄土高路堤经压实后，其垂直位移最大值发生在路堤中部，呈抛物线趋势；位移在路堤坡脚处最小，路堤变形趋势在上部呈向内、向下移动的趋势，即呈现“凹盆”，在1／3～2／3路堤高处呈向外“挤出”趋势；对于非饱和黄土，在瞬时加载后，其表层沉降变形可分为瞬时沉降和土体固结沉降，前者为主要变形。结果表明建立的非饱和黄土三维固结方程能很好地模拟与分析黄土路堤的固结变形，具有较好的应用前景。According to the structural, under-compressible, unsaturated and anisotropic characters of loess, loess was regarded as unsaturated soil, its 3-D consolidation equations were derived based on unsaturated soil theory, and its consolidation deformation characters were analyzed by FEM; It is pointed that compressed subgrade settlement deformation appears ＂sag＂ shape, its maximum settlement lies in embackment center, embackment shoulder settlement is minimum, and 1/3- 2/3 of embankment high appears outward ＂extrusion＂ tendency; stress change tendency is inward and downward increasing, and minimum shear stress lies in slope toe; for unsaturated soil, after instantaneous loading, its surface settlement contains instantaneous settlement and soil mass consolidation settlement, and the former is main deformation. Analysis result shows derived unsaturated loess 3-D consolidation equations can well simulate and analyze the consolidation deformation of loess embankment, and its aoolication prosoect is auite good. 2 tabs. 8 figs.10 refs.

关 键 词：路基工程 黄土 非饱和土 三维固结 数值解法 固结变形 

分 类 号：U416.169[交通运输工程—道路与铁道工程]