Effect of NaCl Concentration on the Cumulative Strain and Pore Distribution of Clay under Cyclic Loading  

作　　者：Xinshan Zhuang Shunlei Xia Ruijie Pan 

机构地区：[1]School of Civil Engineering and Architecture,Hubei University of Technology,Wuhan,430068,China

出　　处：《Fluid Dynamics & Materials Processing》2024年第2期447-461,共15页流体力学与材料加工（英文）

摘　　要：Clay,as the most common soil used for foundationfill,is widely used in various infrastructure projects.The phy-sical and mechanical properties of clay are influenced by the pore solution environment.This study uses a GDS static/dynamic triaxial apparatus and nuclear magnetic resonance experiments to investigate the effects of cyclic loading on clay foundations.Moreover,the development of cumulative strain in clay is analyzed,and afitting model for cumulative plastic strain is introduced by considering factors such as NaCl solution concentration,con-solidation stress ratio,and cycle number.In particular,the effects of the NaCl solution concentration and con-solidation stress ratio on the pore distribution of the test samples before and after cyclic loading are examined,and the relationship between microscopic pore size and macroscopic cumulative strain is obtained accordingly.Our results show that as the consolidation stress ratio grows,an increasing number of large pores in the soil samples are transformed into small pores.As the NaCl solution concentration becomes higher,the number of small pores gradually decreases,while the number of large pores remains unchanged.Cyclic loading causes the disappearance of the large pores in the samples,and the average pore size before cyclic loading is posi-tively correlated with the axial cumulative strain after cyclic loading.The cumulative strain produced by the soil under cyclic loading is inversely proportional to the NaCl solution concentration and consolidation stress ratio.

关 键 词：Geotechnical engineering CLAY cyclic loading nuclear magnetic resonance NaCl solution consolidation ratio accumulative strain 

分 类 号：TG14[一般工业技术—材料科学与工程]