The deformation and microstructure characteristics of expansive soil under freeze-thaw cycles with loads

doi:10.1016/j.coldregions.2021.103393

	The deformation and microstructure characteristics of expansive soil under freeze-thaw cycles with loads
	Li, Tianguo 1,2; Kong, Lingwei 1,2; Guo, Aiguo 1,2
刊名	COLD REGIONS SCIENCE AND TECHNOLOGY
	2021-12-01
卷号	192 页码:15
关键词	Freeze-thaw cycles Nuclear magnetic resonance Deformation Loads
ISSN号	0165-232X
DOI	10.1016/j.coldregions.2021.103393
英文摘要	The expansive soil in seasonally frozen areas is vulnerable to repeated freezing and thawing. When exposed to freeze-thaw cycles, this soil may pose a danger to civil engineering structures and cause serious economic losses. Using a closed-system freeze-thaw test, the deformation characteristics of expansive soil under freeze-thaw cycles with different loads were studied. Nuclear magnetic resonance (NMR) and SEM technology were used to study the microstructure characteristics of the soils after the freeze-thaw cycles. The test results show that the soils under different load conditions have different deformation characteristics. The pre-freezing stage of soils under loads is significantly longer than that for soil without a load. Loads play a key role in the deformation caused by freeze-thaw cycles. There exists also a freezing load (pF) and melting load (pT), under which the soil volume change is zero in the frozen and melted state after the soil reaches equilibrium. NMR and SEM tests showed that the pore structure characteristics of the soils under different loads are significantly different. When a low load is applied during the freeze-thaw cycles, the freeze-thaw cycles will damage the structure of the soil, forming new cracks and hence resulting in a loose pore structure. However, if there is a high load, the freeze -thaw cycles contribute to the formation of a dense pore structure. A backfilled soil thickness of 1.5-2.5 m is proposed without considering the gravity of the supporting structure.
资助项目	National Key R&D Program of China[2019YFC1509901]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000728673600006
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/30936]
专题	中科院武汉岩土力学所
通讯作者	Kong, Lingwei
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Li, Tianguo,Kong, Lingwei,Guo, Aiguo. The deformation and microstructure characteristics of expansive soil under freeze-thaw cycles with loads[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2021,192:15.
APA	Li, Tianguo,Kong, Lingwei,&Guo, Aiguo.(2021).The deformation and microstructure characteristics of expansive soil under freeze-thaw cycles with loads.COLD REGIONS SCIENCE AND TECHNOLOGY,192,15.
MLA	Li, Tianguo,et al."The deformation and microstructure characteristics of expansive soil under freeze-thaw cycles with loads".COLD REGIONS SCIENCE AND TECHNOLOGY 192(2021):15.