作　　者： ; ; ;

机构地区： 浙江大学建筑工程学院土木工程学系

出　　处： 《力学学报》 2005年第1期92-99,共8页

摘　　要： 以往大变形固结理论主要基于一般的固体力学模型，其控制方程忽视了固结过程中排水引起的质量变化．提出饱和上的连续介质模型，并基于连续介质力学的公理体系推导了反映质量变化的欧拉描述的大变形固结控制方程．发现传统固结理论中：(1)忽视了渗流速度对土体平衡条件的影响；(2)决定土体平衡的总应力张量只有在土体变形速度和渗流速度方向相同时才具有对称性等．在忽略变质量效应等条件下，传统理论成为本文理论的特例．通过算例的有限元分析，比较了欧拉描述与两种物质描述方法的差别，得到初步结论：(1)欧拉描述方法计算的地基沉降量要小于物质描述方法的结果；(2)欧拉描述方法计算的侧向位移偏大于两种物质描述结果． Traditional finite strain consolidation theory(TFSCT)is generally established on solid mechanicsmodel,which ignores the mass decrement effect on its governing equations,due to the discharge phenomenonduring soil consolidation process.A new continuum model for saturated soil is firstly idealized and presentedin this paper.Then based on the principles of continuum mechanics,the finite strain consolidation theory withEulerian description(FSCTED)is presented,and its governing equations are correspondingly derived strictly.Compared with FSCTED,it's found in TFSCT that(1)the influence of seepage velocity on the equilibriumcondition is neglected;(2)the total stress tensor in the equilibrium equation keeps symmetric if and only if soildeformation speed rate has the same direction as the seepage velocity,etc.Leaving out of consideration the massdecrement effect during the consolidation process,TFSCT becomes a special case of FSCTED presented here.Through the finite element analysis of a certain roadbed as an illustrative example,the results of FSCTED arecompared with those of two kinds of material descriptions,i.e.T.L.and U.L.The following conclusions are drawnas(1)the magnitude of calculated settlement of FSCTED is less than those of material descriptions;(2)thepredicted lateral displacement of FSCTED is overestimated in comparison with those of material descriptions,etc.

关 键 词： 大变形 固结 欧拉描述 饱和土 连续介质

领　　域： [建筑科学] [建筑科学]