干砂土高频振动下压缩变形特性试验研究  

Experimental study on compression of dry sand under high-frequency vibration

作　　者：林奇[1] 宋春雨[1] 陈龙珠[1] 吴雪萍[1] 

机构地区：[1]上海交通大学船建学院安全与防灾工程研究所,上海200240

出　　处：《世界地震工程》2010年第S1期54-58,共5页World Earthquake Engineering

基　　金：国家自然科学基金项目(50779034)

摘　　要：在自行改装高频振动系统基础上,通过对干砂土进行高频振动压缩室内试验,研究了干砂土变形特性。试验研究表明:在18~27 Hz的频率范围内,塑性压缩变形随着频率的增加而减少速度很快;在27~37 Hz的频率范围内,塑性压缩变形随着频率的增加而减少速度减缓。重点分析了相对密实度、动应力幅值等因素对高频振动下频率与塑性压缩变形之间关系的影响。分析结果表明,虽然在频率较低时,这2个因素对塑性压缩变形影响很大,在高频时,塑性压缩变形对这2个因素不敏感;但是它们并不会改变频率与塑性压缩变形关系曲线变化的趋势。Dry sand compression tests are carried out in the lab to study the compression behavior.The experimental results show that when frequency is in the range of 18～27 Hz,with the increasing of vibration frequency,residual deformation decreases quickly,when frequency is in the range of 27～37 Hz,with the increasing of vibration frequency,the decrease of residual deformation slows down.The effects of initial relative density and amplitude of cyclic stress on the relationship between frequency and residual deformation are investigated.The results show that for lower frequency,the initial relative density and the amplitude of cyclic stress has great impact on the value of residual deformation,while for higher frequency,residual deformation is not sensitive.However,these can not change the trends of changes and the relation between the frequency and residual deformation.

关 键 词：干砂土 振动频率 塑性压缩变形 

分 类 号：TU441.4[建筑科学—岩土工程]