基于修正剑桥模型的挤密桩挤土效应分析  

Analysis of squeezing effect of compaction piles based on modified Cam-clay model

作　　者：宋勇军[1] 胡伟[2] 王德胜 周军林 

机构地区：[1]长安大学公路学院,西安710064 [2]海南大学土木建筑学院,海口570228 [3]陕西省机械施工公司,西安710032

出　　处：《岩土力学》2011年第3期811-814,共4页Rock and Soil Mechanics

基　　金：海南省自然科学基金(No.809001)

摘　　要：将挤密桩挤土过程视作沿桩长不变的一系列点位形成的球形孔扩张过程,把扩张过程中的桩周土体分为3个区域:流动破坏区、塑性变形区、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孔扩张引起的土体应力、位移分布解析解。结果表明,挤密桩塑性区半径为桩半径的2.92倍,与试验结果基本吻合,验证了该分析方法的可行性。其结果可为挤密桩挤土效应的研究提供一种新的思路。Squeezed process of compaction 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 divided into three zones： flow damage zone,plastic deformation zone and elastic deformation zone.The analytical expressions 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.The results show that the radius of plastic zone is 2.92 times that of radius of pile,verified the feasibility of the method of analysis.The results will provide a new idea for compaction effect research.

关 键 词：挤密桩 挤土效应 圆孔扩张理论 修正剑桥模型 

分 类 号：TU470[建筑科学—结构工程]