基于二次抛物线型强度包络线的管桩挤土效应分析  

Analysis of driving effect of tubular pile based on two-parameter parabolic failure envelope

作　　者：刘伟平[1] 扶名福[1] 胡小荣[1] 

机构地区：[1]南昌大学建筑工程学院,江西南昌330031

出　　处：《煤田地质与勘探》2010年第2期36-38,共3页Coal Geology & Exploration

基　　金：国家自然科学基金项目(10862004);江西省自然科学基金项目(2007GZC2073);教育部博士点基金项目(20050403002)

摘　　要：假定管桩在沉桩时的挤土过程是一个圆柱形孔扩张过程。基于具有抛物线型强度包络线和圆孔扩张理论对管桩的挤土效应进行分析研究。分析了桩周土体周围土体的弹塑性力学行为,得到应力场和位移场等的表达式,并求得其塑性区半径、孔内最终压力。其结果可以为管桩工程问题提供理论依据。Based on the hypothesis that the pile driving process is regarded as cavity expansion, according to two-parameter parabolic failure envelope and the cavity expansion theory, the driving effect of the tubular pile is studied. The elasto-plastic analysis solution of the stress field and displacement field of the soil around the pile are given. The radius of plastic zone and the limit expansion pressure are obtained. It can provide theoretical supports for some tubular pile engineering practices.

关 键 词：管桩 挤土效应 二次抛物线型强度包络线 弹塑性分析 

分 类 号：TU47[建筑科学—结构工程]