软黏土中静压桩打桩过程对土体强度和刚度影响的理论分析  

Theoretical Analysis of the Variation of Soil Strength and Rigidity Induced by Pile Penetration in Soft Clay

作　　者：周航[1,2] 王增亮 申航 李籼橙 ZHOU Hang;WANG Zengliang;SHEN Hang;LI Xiancheng(Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education,Chongqing University,Chongqing 400045,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学山地城镇建设与新技术教育部重点实验室,重庆摇400045 [2]重庆大学土木工程学院,重庆摇400045

出　　处：《北京工业大学学报》2021年第7期719-727,814,共10页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51978105)。

摘　　要：针对软黏土中的打桩问题,提出一种包含完全排水和完全不排水的柱孔扩张通用求解方法,并基于该方法,采用不排水柱孔扩张理论模拟静压桩打桩过程,并采用修正剑桥模型模拟软黏土的本构关系,同时联立扩孔运动学方程、应力平衡方程、质量守恒方程等建立弹塑性孔扩张偏微分控制方程组,利用相似变换的技术求解该方程组,从而获得半解析解.通过与文献中的解答对比,验证了解答的正确性.Aiming at the problem of pile penetration in soft clay,a general solution method using undrained cylindrical cavity expansion model for perfectly drained and undrained cases was proposed.This soil was described by the modified Cam-clay(MCC)model and the partial differential equations for the elastic-plastic cylindrical cavity expansion were presented by combing the kinematics equations,stress equilibrium equations and the mass conservation equations.The similarity solution technique was selected for solving the equations and the semi-analytical solution was obtained.The solution was validated by comparing with the published solutions.

关 键 词：软黏土 柱孔扩张理论 半解析解 修正剑桥模型 弹塑性 土体扰动 

分 类 号：TU43[建筑科学—岩土工程]