Effect of Moisture Content on the Permanent Strain of Yellow River Alluvial Silt under Long-Term Cyclic Loading

Zibo Du, Zheng Zhang, Lei Wang (), Jingwei Zhang and Yonghui Li
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Zibo Du: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Zheng Zhang: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Lei Wang: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Jingwei Zhang: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Yonghui Li: School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

Sustainability, 2023, vol. 15, issue 17, 1-24

Abstract: The Yellow River alluvial silt has unique engineering properties and is unstable when encountering moisture. The mechanical properties of silt subgrade can be impaired by the increase in moisture content due to rainwater infiltration, which has a negative effect on traffic safety. To further reveal the influence of moisture content on the deformation characteristics of silt, a series of monotonic and cyclic triaxial tests were conducted on the alluvial silt with different moisture contents. The development law of cyclic accumulative permanent strain and the effects of moisture content, cyclic deviator stress and confining pressure on the axial permanent strain of silt were explored. The study shows that the static strength of silt decreases with the increase in moisture content, and the attenuation of static strength is mainly caused by the decrease in cohesion due to the reduction in matric suction. The permanent strain rises linearly with the increase in moisture content and cyclic deviator stress, and decreases with the increase in confining pressure. An empirical model for predicting the permanent strain of silt under long-term cyclic loading considering the effect of moisture content was established. Compared with the test data and other existing models, the established model has easier obtained parameters, higher prediction accuracy and better applicability.

Keywords: alluvial silt; permanent deformation; cyclic triaxial test; moisture content; empirical model (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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