微型管桩高频振动贯入过程挤土效应数值分析  

Numerical analysis on squeezing effect of micro-pipe during high frequency vibration penetration

作　　者：孟伟[1] 陈页开[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510641

出　　处：《广西大学学报（自然科学版）》2017年第4期1441-1448,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50808086)

摘　　要：高频振动贯入桩因具有低噪音和低振动的优点而得到广泛应用。为研究微型管桩高频振动贯入过程的机理,采用耦合的欧拉—拉格朗日方法建立微型管桩高频振动贯入过程的三维有限元模型,对桩贯入过程中桩挤土应力和挤土位移进行了分析。研究结果表明:单桩高频贯入过程中,桩周土体水平应力在径向方向上急剧衰减;深度方向上,土体水平应力最大值出现在桩端下方,且最大值随桩的贯入深度增加而增加;地表位移以隆起为主,随径向距离增大而减小;群桩依次贯入时,后打入桩会造成先打入桩周边土体的竖向位移和水平位移增加。High frequency vibration penetration pile is widely used for the advantage of low vibration and low noise. In order to study the mechanism of high frequency vibration penetration of micro pipe pile,a 3D finite element model of micro-pipe pile penetration process with high frequency vibration was established by adopting coupled Euler-Lagrangian method, and the squeezing stress and squeezing displacement during the process of pile penetration were analyzed. The results show that during the process of pile penetration,the horizontal stress of soil decays drastically in the radial direction,the maximum horizontal stress of soil appears below the pile end,and the value increases with the pile penetration depth. The ground surface settlement is mainly dominated by the uplift,and the value of the uplift decreases with the increase of the distance in the radial direction. When group piles penetrate in turn,the piles penetrated later will make the vertical and horizontal displacement of soil around the pile penetrated earlier increase.

关 键 词：微型管桩 高频振动 耦合的欧拉—拉格朗日 挤土效应 

分 类 号：TU473.1[建筑科学—结构工程]