Experimental Study on Direct Shear Mechanical Behavior of Unsaturated Loess-Steel Interface Considering Freeze-Thaw Cycles

doi:10.1007/s40098-022-00684-2

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	Experimental Study on Direct Shear Mechanical Behavior of Unsaturated Loess-Steel Interface Considering Freeze-Thaw Cycles
	Wang, Lijie; Chou, Yaling
	2023-06
发表期刊	INDIAN GEOTECHNICAL JOURNAL
ISSN	0971-9555
卷号	53 期号:3 页码:523-537
摘要	The strength characteristics and stress-strain relation of the interface between soil and structure are the key parameters to determine the bearing capacity and security of foundation engineering. Especially in cold regions, periodic freeze-thaw cycles have repeatedly changed microstructure and physical-mechanical properties of shallow unsaturated soil, which has directly affected the interaction between soil and structure. In order to better serve the practical project, the mechanical behaviors of unsaturated loess-steel interface were studied considering freeze-thaw cycles, water content and the matric suction of loess based on the direct shear test. The results show that with the increase in freeze-thaw times, the cohesion (c) and internal friction angle (phi) of interface first increase and then decrease and gradually tend to be stable, while the matric suction gradually decreases and becomes steady. When the vertical load is low (not more than 200 kPa), brittle failure occurs near the loess-steel interface both before and after freezing-thawing. As the vertical load increases, the failure mode of interface gradually changes from brittle failure to plastic failure. The constitutive model of shear stress and displacement as well as freeze-thaw cycles on the loess-steel interface is tried to be established based on experimental data, and Gompertz model is turned out to be a good expression of the relationship between shear stress and displacement of the loess-steel interface considering freeze-thaw cycles. The aim of the study is to reveal how freeze-thaw cycle has affected the strength characteristics and stress-strain relation of unsaturated loess-steel interface, hopefully to provide reference for the numerical calculation and engineering design of the foundation bearing capacity in seasonal frozen soil regions. And the research results have theoretically filled the gap in the research field of the effect of freeze-thaw on mechanical behaviors of unsaturated loess-steel interface, and provided scientific basis for the design and safety evaluation of geotechnical structures in seasonal frozen soil regions.
关键词	Direct shear test Loess-Steel interface Matric suction Freeze-thaw cycles Constitutive model
DOI	10.1007/s40098-022-00684-2
收录类别	ESCI ; EI
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Geological
WOS记录号	WOS:000889023700001
出版者	SPRINGER INDIA
EI入藏号	20224813177661
EI主题词	Constitutive models
EI分类号	408.1 Structural Design, General ; 483 Soil Mechanics and Foundations ; 483.1 Soils and Soil Mechanics ; 601.2 Machine Components ; 914 Safety Engineering ; 921 Mathematics
来源库	WOS
引用统计	无
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/160480
专题	法学院土木工程学院
通讯作者	Chou, Yaling
作者单位	Lanzhou Univ Technol, Key Lab Disaster Prevent & Mitigat Civil Engn, 287 Langongping Rd, Lanzhou 730050, Gansu, Peoples R China
第一作者单位	兰州理工大学
通讯作者单位	兰州理工大学
第一作者的第一单位	兰州理工大学
推荐引用方式 GB/T 7714	Wang, Lijie,Chou, Yaling. Experimental Study on Direct Shear Mechanical Behavior of Unsaturated Loess-Steel Interface Considering Freeze-Thaw Cycles[J]. INDIAN GEOTECHNICAL JOURNAL,2023,53(3):523-537.
APA	Wang, Lijie,&Chou, Yaling.(2023).Experimental Study on Direct Shear Mechanical Behavior of Unsaturated Loess-Steel Interface Considering Freeze-Thaw Cycles.INDIAN GEOTECHNICAL JOURNAL,53(3),523-537.
MLA	Wang, Lijie,et al."Experimental Study on Direct Shear Mechanical Behavior of Unsaturated Loess-Steel Interface Considering Freeze-Thaw Cycles".INDIAN GEOTECHNICAL JOURNAL 53.3(2023):523-537.