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

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Research in Cold and Arid Regions 2023年第4期15卷 161-170页

作者： Hao Wang Xu Li WenShao Xin Vladimir Nikolaevich Paramonov XueWen Zhao Department of Civil Engineering University of OttawaOttawaON K1N6N5Canada Key Laboratory of Urban Underground Engineering of Ministry of Education Beijing Jiaotong UniversityBeijing 100044China Emperor Alexander I St.Petersburg State Transport University St.Petersburg 190031Russia Qingdao Transportation Planing and Design Institute Co. Ltd.QingdaoShandong 266043China

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.

关键词： Bentonite relative compaction Degree of saturation Freeze-thaw cycles Deformation

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