单桩复合地基上块体振动特性分析  

Dynamics of block on composite foundation with single pile

作　　者：宋春雨[1] 陈龙珠[1] 夏宇峰[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200030

出　　处：《地震工程与工程振动》2004年第2期134-140,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50079027)

摘　　要：本文利用轴对称有限元-无限元耦合模型和现场试验,系统地分析了搅拌桩、碎石桩的长度、直径和波速及其桩身缺陷对单桩复合地基上圆形块体竖向振动速度导纳特性的影响,结果表明块体的低频速度导纳幅值比共振频率更能稳健地反映出复合地基的性状变化。本文研究对进一步完善复合地基动测理论与技术具有参考价值。In this paper, the axial symmetric dynamics of a block on composite foundation improved by deep mixing pile or stone column is analyzed with the coupled model of finite and infinite elements, including effects of length, diameter and defects of the pile or column as well as the elastic modulus ratio of the pile or column to subsoil. Field measurements are introduced to show some features of the measured velocity admittance vs. frequency curves of a block on the defected composite foundation. The conclusion will be significant for further research on dynamic test method of engineering parameters for composite foundations.

关 键 词：复合地基 有限元 无限元 导纳 动测 

分 类 号：TU473.1[建筑科学—结构工程] P315.9[建筑科学—土工工程]