Influence of Dry-Wet Cycles on the Structure and Shear Strength of Loess

Xiaoliang Wang, Hongru Li, Yue Zhong, Longfei Zhang, Xi Yang, Xiaoning Han and Zaiqiang Hu ()
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Xiaoliang Wang: School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an 710048, China
Hongru Li: School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an 710048, China
Yue Zhong: Shaanxi Railway Institute, Weinan 714000, China
Longfei Zhang: School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an 710048, China
Xi Yang: School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an 710048, China
Xiaoning Han: School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an 710048, China
Zaiqiang Hu: School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an 710048, China

Sustainability, 2023, vol. 15, issue 12, 1-20

Abstract: The dry-wet cycle is an important factor that causes slope instability and foundation settlement in loess regions. In order to study the effects of the dry-wet cycle on the structure and shear strength of loess, isotropic compression tests and triaxial shear tests were carried out on loess with different numbers of dry-wet cycles. The results show that the dry-wet cycles mainly reduce the cohesion of loess, and the most obvious decline is after the first cycle; however, they have no effect on the angle of internal friction of loess. The structural yield strength and structural parameters of loess can represent the structure of loess well, which gradually decrease with the increase in the number dry-wet cycles and water content. The initial yield surface is approximately an ellipse, which gradually shrinks with the increase in water content and dry-wet cycles. The structure and cohesion of loess have similar changes, and there is an obvious exponential function relationship between them.

Keywords: shear strength; structure; dry-wet cycles; structural strength; structural parameter (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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