Influence of relative compaction and degree of saturation on the deformation characteristics of bentonite under freeze-thaw cycles

作     者：Hao Wang Xu Li WenShao Xin Vladimir Nikolaevich Paramonov XueWen Zhao Hao Wang;Xu Li;WenShao Xin;Vladimir Nikolaevich Paramonov;XueWen Zhao

作者机构：Department of Civil EngineeringUniversity of OttawaOttawaON K1N6N5Canada Key Laboratory of Urban Underground Engineering of Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China Emperor Alexander I St.Petersburg State Transport UniversitySt.Petersburg 190031Russia Qingdao Transportation Planing and Design Institute Co.Ltd.QingdaoShandong 266043China 

出 版 物：《Research in Cold and Arid Regions》 (寒旱区科学（英文版）)

年 卷 期：2023年第15卷第4期

页      面：161-170页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：supported by the National Natural Science Foundation of China(Nos.42072316 51979002) 

主　　题：Bentonite Relative compaction Degree of saturation Freeze-thaw cycles Deformation 

摘      要：Bentonite,consisting of clay minerals of the montmorillonite group,has been widely used as an adsorbent and backfill material in nuclear waste disposal and groundwater *** is challenging to use bentonite as a filling material in cold regions since bentonite is highly sensitive to thermal environmental changes,during which its bulk volume and microstructure change *** this study,a series of one-dimensional and three-dimensional freeze-thaw tests were carried out within a closed system to investigate the influencing factors of the deformation of bentonite under freeze-thaw *** show that the initial soil water content greatly impacts bentonite s deformation during freeze-thaw *** an initial higher degree of saturation(Sr),the expansion caused by the formation of ice lenses has a greater impact than the shrinkage induced by dehydration,ice-cementation,and so ***,bentonite tends to shrink at a lower degree of saturation during *** the critical degree of saturation that determines bentonite s behavior of frost heave or frost shrinkage seems to be roughly *** the number of freeze-thaw cycles rises,initially uncompacted bentonite clay becomes more compacted,and initially compacted bentonite clay remains unchanged.