土体条件对水平荷载下桩 土作用影响分析

Effect of Soil Conditions on Pile-Soil Interaction under Horizontal Loading

基于Abaqus软件建立三维有限元模型,分析了土体弹性模量、泊松比及粘聚力三种条件对桩身弯矩、水平位移的影响,提出了预测桩身弯矩及水平位移的“内部中点插值法”和“拟合函数插值法”两种预测方法。结果表明:桩身弯矩随深度的增加先增大后减小,各土体条件值与桩身最大弯矩符合对数关系;桩身正方向水平位移随深度的增加不断减小,桩身负方向水平位移随着深度的增加先增大后减小,各土体条件值与桩身最大水平位移符合幂函数关系;提高各土体条件值均减小桩身最大弯矩及最大水平位移,其中提高土体弹性模量对其减小程度最大。桩身弯矩及水平位移在土体条件值范围内预测时,桩身埋置深度一半处以上采用“拟合函数插值法”,以下采用“内部中点插值法”,在土体条件值范围外预测时,采用“拟合函数插值法”。

Based on the three-dimensional finite element model of Abaqus software,this paper analyzes the influence of three conditions of elastic modulus,Poisson ratio and viscoelastic force on the bending moment and horizontal displacement of pile body,and puts forward two prediction methods,“internal midpoint interpolation method”and“fitting function interpolation method”to predict the bending moment and horizontal displacement of pile body.The results show that the bending moment of pile body increases first and then decreases with the increase of depth,the condition value of each soil is in accordance with the logarithmic relation with the maximum bending moment of pile body,the horizontal displacement of pile body is decreasing with the increase of depth,the horizontal displacement of pile direction increases first with the increase of depth,and the power function relation is in accordance Increasing the condition value of each soil reduces the maximum bending moment and the maximum horizontal displacement of the pile body,in which the increase of the elastic modulus of the soil is the most decreasing,and when the bending moment and horizontal displacement of the pile body are predicted in the range of soil condition,the“fitting function interpolation method”is used for the buried depth of the pile body.When predicting outside the range of soil condition value,the“fitting function interpolation method”is used.