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DOI	10.1155/2021/6688724
	Shear Properties and Mechanism of Freeze-Thaw Interface in Unsaturated Coarse-Grained Soil from Qinghai-Tibet Plateau
	Qu, Yonglong; Ni, Wankui; Niu, Fujun; Mu, Yanhu; Luo, Jing; He, Hui
通讯作者	Qu, YL (通讯作者)，Xian Technol Univ, Sch Civil & Architecture Engn, Xian 710021, Peoples R China. ; Qu, YL (通讯作者)，Changan Univ, Coll Geol Engn & Geomat, Xian 710054, Peoples R China. ; Mu, YH (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China.
发表日期	2021
ISSN	1687-8086
EISSN	1687-8094
卷号	2021
英文摘要	Freeze-thaw interface in unsaturated coarse-grained soil (CGS) is a weak plane which can cause slope failures in cold regions. This study presents a series of large-scale direct shear tests on freeze-thaw interface in CGS through a temperature control system. The tested soil was taken from a high slope in the Qinghai-Tibet Plateau. It was remolded with three dry densities (1.9, 2.0, and 2.15 g/cm(3)) and three moisture contents (9.0%, 11.5%, and 14.0%). With testing results, direct shear curves mainly performed as hardening deformation, and they were affected considerably by specimen conditions. The shear strength increased with both the increasing dry density and normal stress, but it was opposite with moisture content changed. The cohesion and internal friction angle increased with the increase in dry density but decreased with the moisture content. The particle movement and water migration of freeze-thaw interface in CGS during the test were significant, and they had close relations with the shear properties of specimens. And, an empirical model was produced to express the effect of pore ice on the shear strength of interface during the shear test. The tests and analysis in this study may provide useful references for CGS slope stability analysis in high cold regions.
关键词	PERMAFROST REGIONS WATER MIGRATION SLOPE FAILURE FROZEN SOIL FROST HEAVE DEPTH SIMULATION CYCLES
语种	英语
WOS研究方向	Construction & Building Technology ; Engineering
WOS类目	Construction & Building Technology ; Engineering, Civil
WOS记录号	WOS:000629367200002
来源期刊	ADVANCES IN CIVIL ENGINEERING
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253911
作者单位	[Qu, Yonglong; He, Hui] Xian Technol Univ, Sch Civil & Architecture Engn, Xian 710021, Peoples R China; [Qu, Yonglong; Ni, Wankui] Changan Univ, Coll Geol Engn & Geomat, Xian 710054, Peoples R China; [Niu, Fujun; Mu, Yanhu; Luo, Jing] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Qu, Yonglong,Ni, Wankui,Niu, Fujun,et al. Shear Properties and Mechanism of Freeze-Thaw Interface in Unsaturated Coarse-Grained Soil from Qinghai-Tibet Plateau[J]. 中国科学院西北生态环境资源研究院,2021,2021.
APA	Qu, Yonglong,Ni, Wankui,Niu, Fujun,Mu, Yanhu,Luo, Jing,&He, Hui.(2021).Shear Properties and Mechanism of Freeze-Thaw Interface in Unsaturated Coarse-Grained Soil from Qinghai-Tibet Plateau.ADVANCES IN CIVIL ENGINEERING,2021.
MLA	Qu, Yonglong,et al."Shear Properties and Mechanism of Freeze-Thaw Interface in Unsaturated Coarse-Grained Soil from Qinghai-Tibet Plateau".ADVANCES IN CIVIL ENGINEERING 2021(2021).