Investigation on microstructure evolution of clayey soils: A review focusing on wetting/drying process
作者机构：School of Earth Sciences and EngineeringNanjing UniversityNanjing210023China Global Education and Infrastructure Services Inc.CharlotteUSA
出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)
年 卷 期：2023年第15卷第1期
页 面：269-284页
核心收录：
学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）]
基 金：This work was supported by National Natural Science Founda-tion of China(Grant Nos.41925012 and 41902271) Natural Science Foundation of Jiangsu Province(Grant No.BK20211087)
主 题：Soil microstructure Pore size distribution(PSD) Wetting/drying cycle Suction Volume change
摘 要：Variability in moisture content is a common condition in natural *** influences soil properties significantly.A comprehensive understanding of the evolution of soil microstructure in wetting/drying process is of great significance for interpretation of soil macro hydro-mechanical *** this review paper,methods that are commonly used to study soil microstructure are *** them are scanning electron microscope(SEM),environmental SEM(ESEM),mercury intrusion porosimetry(MIP)and computed tomography(CT)***,progress in research on the soil microstructure evolution during drying,wetting and wetting/drying cycles is summarized based on reviews of a large body of research papers published in the past several *** compacted on the wet side of op-timum water content generally have a matrix-type structure with a monomodal pore size distribution(PSD),whereas soils compacted on the dry side of optimum water content display an aggregate structure that exhibits bimodal *** drying,decrease in soil volume is mainly caused by the shrinkage of inter-aggregate *** wetting,both the intra-and inter-aggregate pores increase gradually in number and *** in the characteristics of the soil pore structure significantly depend on stress state as the soil is subjected to *** wetting/drying cycles,soil structural change is not completely reversible,and the generated cumulative swelling/shrinkage deformation mainly derives from ***,based on this analysis and identified research needs,some important areas of research focus are proposed for future *** areas include innovative methods of sample preparation,new observation techniques,fast quantitative analysis of soil structure,integration of microstructural parameters into macro-mechanical models,and soil microstructure evolution charac-teristics under multi-field coupled conditions.
维普期刊数据库