NaCl溶液饱和软粘土的动力特性试验研究  

Experimental Study of the Effect of NaCl Solution Concentration on the Dynamic Properties of Saturated Soft Clay

作　　者：孙磊 吴瑕 王依凡 周子祥 张硕 Sun Lei;Wu Xia;Wang Yifan;Zhou Zixiang;Zhang Shuo(School of Resources and Civil Engineering,Suzhou University,Suzhou,Anhui 234000,China)

机构地区：[1]宿州学院资源与土木工程学院,安徽宿州234000

出　　处：《黑龙江工业学院学报（综合版）》2023年第8期119-124,共6页Journal of Heilongjiang University of Technology(Comprehensive Edition)

基　　金：安徽省教育厅高校优秀青年人才支持项目“考虑孔隙水化学效应的海洋软粘土循环应变累积特性试验研究”(项目编号:gxyq2022106);宿州学院大学生创新创业训练计划项目“地震作用下盐溶盐饱和粘土的强度特性试验研究”(项目编号:ZCXM22-311)。

摘　　要：为了探究盐溶液饱和软粘土在循环荷载作用下的动力特性,借助DSZ-2型电磁振动三轴试验系统对人工制备饱和软粘土开展了一系列的不排水循环剪切试验,重点探究了围压和NaCl溶液浓度对饱和软粘土动剪切模量G和阻尼比D的影响。试验结果表明:随着剪应变γ的增大,G值逐渐衰减,D值逐渐增大,相同盐溶液浓度和剪应变水平下,围压越大,G值越大,D值越小。当围压和剪应变水平一定时,伴随NaCl溶液浓度的增大,G值先减小后增大,D值先增大后减小。基于试验结果并通过归一化处理方法,分别构建了可以描述盐溶液包含软粘土动剪切模量和阻尼比随剪切应变变化规律的数学模型。In order to investigate the dynamic properties of soft clay soils saturated with salt solution under cyclic loading,a series of undrained cyclic shear tests were carried out on artificially prepared saturated soft clay soils with the aid of DSZ-2 electromagnetism dynamic triaxial test system,focusing on the effects of surrounding pressure and NaCl solution concentration on the dynamic shear modulus G and damping ratio D of saturated soft clay soils.The test results show that as the shear strain γ increases,the G value gradually decays and the D value gradually increases,with the same salt solution concentration and shear strain level,the higher the surrounding pressure,the higher the G value and the smaller the D value.When the enclosure pressure and shear strain level are certain,along with the increase of NaCl solution concentration,the G value decreases and then increases,and the D value increases and then decreases.Based on the experimental results and through the normalization method,mathematical models that can describe the variation of dynamic shear modulus and damping ratio with shear strain of soft clay contained in salt solution were constructed respectively.

关 键 词：NACL溶液 饱和软粘土 动三轴试验 动剪切模量 阻尼比 

分 类 号：TU442[建筑科学—岩土工程]