摘要
软土具有黏滞性,对其固结和变形会产生一定程度的影响。采用现有基于广义Voigt流变模型的单层黏弹性地基一维固结问题求解方法,获得各土层的孔压通解表达式。根据两层土体接触面处孔压和流量连续条件及边界条件,给出了系统的正交关系,进而确定通解中待定系数。广义Voigt模型反映了土体应力应变关系在不同时期的特征,因此该解有广泛的适用性。采用岩土工程中应用较广的Merchant流变模型对一工程算例进行了分析。分析结果表明,土体的黏滞性降低了土体的固结速度,且深度越深,影响幅度越大。
Soft clay has viscoelastic characteristics, which affects the consolidation and deformation of the soil. Based on the existing one-dimensional consolidation theory of saturated clays with generalized Voigt model, the generalized solution expressions of the two layers are obtained. According to the pore pressure and water flow continuity conditions at the conjunction plane of two layers and the boundary conditions at the top and bottom surfaces, the orthogonal relation of the system is presented. The unknown value in the generalized solution expressions can be determined by using continuity conditions, boundary conditions and the orthogonal relation. Generalized Voigt model can reflect the stress-strain relation of the soil at different phases; so the solutions can be applied extensively A case of double-layered viscoelastic ground is analyzed where Merchant theological model is applied. It is shown that the viscoelastity decreases the consolidation velocity of the soil. The more deep the soil element locate, the more its consolidation velocity is affected.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第4期743-746,752,共5页
Rock and Soil Mechanics
关键词
双层地基
一维固结
流变模型
软土
黏弹性
double-layered ground
one-dimensional consolidation
theological model
soft clay
viscoelasticity
