高频振动下饱和砂土一维压缩残余变形特性  

Characteristics of 1D Compression Residual Deformation of Saturated Sands under High-frequency Vibration

作　　者：林奇[1] 宋春雨[1] 郑文彦[1] 陈龙珠[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院安全与防灾工程研究所,上海200240

出　　处：《上海交通大学学报》2011年第5期728-732,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50779034)

摘　　要：利用自制砂土一维压缩高频振动试验系统对饱和砂土进行压缩试验研究,考察了高频振动下,振动时间、动应力幅值、相对密实度等因素对饱和砂土残余应变与振动频率关系的影响.结果表明:饱和砂土残余变形随着频率增大而减小,残余变形的对数值与振动频率之间的关系可近似用直线来描述;振动时间、动应力幅值、相对密实度对饱和砂土一维振动压缩残余变形影响显著;在相同试验条件下,饱和砂土比干砂土的残余变形量大.The saturated sands compression tests were carried out in the lab to study the deformation behavior by 1D compression test system of high-frequency vibration.The effects of vibration time,amplitude of dynamic stress and relative density on the relationship between residual deformation and vibration frequency were investigated.The experimental results show that the plastic residual deformation of saturated sands decreases with the increasing of vibration frequency under high-frequency vibration,and the relationship of logarithmic residual deformation and vibration frequency is approximately linear.The changing values of residual deformation are caused by vibration time,amplitude of dynamic stress and relative density,but the relationship between residual deformation and vibration frequency wouldn＇t change.Under the same conditions,the plastic residual deformation of saturated sands is greater than dry sands＇.

关 键 词：饱和砂土 振动频率 残余变形 

分 类 号：TU441[建筑科学—岩土工程]