双向振动下含黏粒砂土液化特性试验研究  

Experimental Study on Liquefaction Properties of Clayey Sand under Two-directional Cyclic Vibration

作　　者：黄志全[1] 王伟[1] 张瑞琪[1] 张晓丽[1] 

机构地区：[1]华北水利水电大学,河南郑州450045

出　　处：《华北水利水电大学学报（自然科学版）》2016年第3期55-59,共5页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

基　　金：河南省科技创新人才计划(154100510006);河南省重点科技攻关项目(152102210111);新疆维吾尔自治区科技援疆项目(201491105);新疆自治区高层次人才引进工程资助

摘　　要：采用GCTS双向动三轴测试系统,把膨润土作为试验的黏粒材料,通过饱和砂土的双向动三轴试验,以试样液化的耗损能量为指标,探究不同黏粒含量、干密度、围压及相位差对饱和砂土液化特性的影响。结果表明:随着黏粒含量的增加,砂土液化所需的耗损能量先减少后增加,呈抛物线型,这是因为黏粒含量较低时,黏粒在砂颗粒间起到润滑的作用,随着黏粒含量的增多,黏粒反而起到固定和镶嵌砂颗粒的作用;随着干密度和围压的增大,砂土液化所需的耗损能量不断增加;相位差为180°时更有利于饱和砂土的液化,而相位差的变化与砂土液化所需耗损能量之间的关系不明显。To study the liquefaction properties of clayey sand under two-directional cyclic vibration, we used the two-directional cyclic triaxial testing system and took bentonite as the experimental clay materials, the two-directional cyclic triaxial test on the saturated clay- ey sand was done. We took the liquefaction energy dissipation as the index and discussed the influence of the content of clay particles, the dry density, the confining pressure and the phase difference on the liquefaction properties of clayey sand. The results show： the dis- sipated energy needed by the sand liquefaction firstly decrease and then increase with the increase of the content of clay particles, and the curve is a parabola type, the reason is that the clay particles have a lubrication action among the particles of clayey sand when the content of clay particles is lower; the dissipated energy needed by the clayey sand liquefaction is increasing with the increase of the dry density and the confining pressure; the phase difference of 180° benefits the liquefaction of saturated sand, the relationships between the variation of the phase difference and the dissipated energy needed by the liquefaction of clayey sand is not obvious.

关 键 词：双向动三轴 累计耗损能量 砂土液化 黏粒含量 相位差 

分 类 号：TV16[水利工程] TU411[建筑科学—岩土工程]