堆载下土体侧移及对邻桩作用的有限元分析

在分析堆载作用下土体侧向位移的基础上 ,采用有限元法对无桩条件下的自由场土体侧向位移以及设置桩基后的桩土相互作用进行了数值分析 ,讨论了土体弹性模量和泊松比对土体和桩基侧向变形的影响 .结果表明 ,邻近堆载的自由场土体侧向变形可近似为上部软土的抛物线形和下部硬土的倒三角分布模式 ,采用不同的土体本构模型 (弹性或弹塑性 ) ,桩基的变形规律随弹性模量、泊松比变化而不同

Finite Element Method Used in Modeling Lateral Soil Movement due to Surcharge Loads and Its Effect on Adjacent Piles

Numerical analysis with finite element method (FEM) was herein carried out to assess behaviors of soil subjected to surcharge loads without piles installed and with piles installed respectively.The effects of elastic modulus and Poisson's ratio on lateral soil movement and pile deformation were primarily investigated.The results illustrated that the lateral soil displacements in the "greenfield"(with no piles) distribute as parabolic shape in the upper soft soils and converse triangle shape in the lower stiffer soils.Moreover,the effects of elastic modulus and Poisson's ratio on lateral soil movement and pile deformation under an elastic stress-strain relationship are different from those under an elastic-plasticity constitutive model.