褥垫层对单桩复合地基桩侧摩阻力影响的有限元分析

运用ABAQUS有限元分析软件,分析了在一定地面堆载作用下,褥垫层厚度和变形模量的改变与单桩复合地基桩侧正、负摩阻力大小以及中性点位置的变化关系。结果表明,荷载和褥垫层模量一定时,褥垫层厚度增加对桩充分发挥正摩阻力有利,中性点位置上升;褥垫层厚度小于0.5m时,增加褥垫层变形模量,桩侧正摩阻力也随之提高,中性点位置提升;褥垫层厚度大于0.5m时,增加褥垫层变形模量,其提高更明显。利用数值模拟分析褥垫层对单桩复合地基的桩侧摩阻力影响,可为研究复合地基荷载分担、荷载传递以及工作性状提供借鉴。

Finite Element Analysis of Impact of Cushion on the Skin Fiction in Columns of the Composite Grounds

The effect of thickness and the deformation modulus on both the positive and the negative skin frictions and the neutral position of the single column in a composite ground under the ground surcharge have been analyzed by ABAQUS finite element software.The results indicate that,when the loads and the cushion modulus are constant,the increase of the cushion thickness will help the development of the positive skin friction and the neutral point will be at a higher position;when the thickness of the cushion is less than 0.5meters,the increase of the cushion modulus will increase the positive skin friction and the neutral point location will also be higher;but the raise of the neutral point is not as obvious as when the cushion thickness is great than 0.5meters.The numerical analysis on the impact of cushion thickness and the modulus on the single column in a composite ground will help the understanding of the load transfer mechanism.