中文摘要：

为解决在城市里桩基施工引起的环境问题，国外开发并推广应用了高频液压振动锤技术。通过有限元软件Abaqus对高频振动打桩对邻近桩基影响进行模拟。模拟中桩轴线处建立半径为1mm的管，管土接触设为光滑，打桩时土管分离，桩随着管向下贯入，形成打入桩和周围土体之间的接触关系。打人桩和圆管采用刚体模拟，土体单元则采用摩尔库伦本构模型，建立高频打桩的三维模型，很好的实现高频液压振动沉桩整个过程的数值分析。贯入模拟过程表明打人桩桩尖深度处有应力集中现象；离打入桩越远，受到的影响越小。且分析表明高频振动打桩对邻近桩基的影响很小。

英文摘要：

The stress waves caused by pile driving will disturb surrounding buildings and affect the normal serv- ice of underground facilities. The technique of high frequency hydraulic vibratory pile driving has been widely ap- plied to solve this problem. The effects of pile driving on adjacent piles are investigated by numerical analysis meth- od using software package ABAQUS. A 1.0 mm radius rigid tube is modeled along the axis of penetration. At the beginning of the analysis this tube is in frictionless contact with the surrounding soils. During pile penetration the pile slides over the tube and the soil separates from the tube to establish the contact between the penetrating pile and the surrounding soil. The driven pile and the tube are simulated with rigid body, and the soils with Mohr-Cou- lomb model. Then the three-dimensional model of high frequency hydraulic vibratory pile driving is established. In this way, a numerical analysis for the effects of the full process of pile driving by using high frequency hammers on the adjacent piles are performed. The numerical simulation analysis of pile penetration process shows that the stress concentration occurred around the pile tip. The effect on existing piles is smaller with the larger distance from the driven pile. The analysis also shows the high frequency vibratory pile driving has small effect on adjacent piles.