竖向荷载作用下单桩三维模型参数分析

运用大型数值分析软件GTS,通过设置摩擦接触单元来模拟桩与土之间的共同作用,对桩-土进行三维有限元模拟;分析了桩-土模量比、桩的最终剪力、剪切模量、法向刚度、桩端承载力等因素对桩荷载-沉降(p-s)曲线的影响。分析结果表明:在竖向荷载作用下考虑桩-土间接触与非接触对桩顶竖向位移影响较大;接触面最终剪力、剪切模量、桩端弹簧刚度及土体的弹性模量都会对单桩在竖向荷载作用下荷载-沉降曲线产生显著的影响,而桩端承载力和接触面法向刚度不会对桩荷载-沉降(p-s)曲线产生影响。

3D Numerical Simulation of Model Parameter of Single Pile under Vertical Load

Using large numerical analysis software GTS, by setting up frictional contact unit to simulate the interaction of a pile-soil system and do three dimensional finite element simulation; the impact on P-S curve related to pile soil modulus ratio, the pile final shear, shear modulus, normal stiffness and bearing capacity of the pile was analyzed. Case studies showed that under vertical load considering contact or not would have great effect on vertical displacement of soil;the Interface shear, shear modulus, spring stiffness of pile and elasticity modulus of soil all have a significant influence on the P-S curve of single pile,but the bearing capacity of pile endpoint and normal stiffness of contact surface have no effect on the P-S curve of single pile.