基于修正剑桥模型桩的有限元分析

将桩挤土过程视作沿桩长不变的一系列点位形成的球形扩张过程，把扩张过程中的桩周土体分成3个区域：流动区域、塑性变形区和弹性变形区。应用圆孔扩张理论，结合修正剑桥模型推导出了球形孔扩张引起的土体应力、位移分布解析解，并与有限元ABAQUS模拟的结果对比分析。

FINITE ELEMENT ANALYSIS OF PILE BASED ON MODIFIED CAM-CLAY MODEL

Pile is considered as a series of constant along the length of the spherical cavity expansion point forming process. The stress distribution due to the spheric cavity expansion is diveded into three zones： flow damage, plastic deformation zone and elastic deformation zone. The analytical expression for distribution of the stress and displacement could be deduced on the basis of the cavity expansion theory combining with the Modified Cam-clay model. Then compared with the result of the finite element ABAQUS .