粘粒含量对砂土静动力液化影响的试验  

Experiment of effect of clay content on static and dynamic liquefactionof sand

作　　者：唐小微[1] 李涛[1] 张西文[2] 马玲[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116023 [2]济南大学土木建筑学院,山东济南250022

出　　处：《哈尔滨工程大学学报》2016年第3期332-337,343,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(51078062);国家973计划资助项目(2011CB013605-2)

摘　　要：含一定粘土颗粒的砂土在一定条件下易发生静态和动力液化的现象,且粘土对砂土的抗液化影响规律较为复杂。为了研究粘粒含量对砂土液化的影响规律,通过静力三轴仪和动力三轴仪试验系统,对粘粒含量分别为0%、5%、10%和15%的砂土进行试验。静力与动力的试验结果表明：粘粒含量对砂土抗液化性能的影响并不是单调的,存在一个粘粒含量值（5%~10%）使得砂土的抗液化性能最差。当粘粒含量小于5%时,粘粒会促进孔压的发展;当粘粒含量大于10%时,粘粒会抑制孔压的发展。不同含量的粘粒在砂土颗粒间分别起到润滑与粘结砂粒的作用。Sand with a certain percent of clay is easily liquefied under static and dynamic loading. Clay has a complicated effect on the liquefaction resistance of sand. In order to study the influence of clay content on the liquefaction of sand,sand samples with different clay contents,0%,5%,10% and 15% were investigated with static triaxial and dynamic triaxial test systems. Static and dynamic test results show that the clay content has a non-monotonic impact on the liquefaction resistance of sand. The liquefaction resistance of the mixture is poorest when the clay content is about 5% ~ 10%. When the clay content is less than 5%,the clay promotes pore pressure development.When the clay content is more than 10%,the clay suppresses pore pressure development. Different contents of clay play roles of lubrication and cementation between sand particles.

关 键 词：粘粒含量 抗液化 液化试验 抗剪强度 孔压 

分 类 号：TU441[建筑科学—岩土工程]