Accumulative Strain of Sand-Containing Soft Soil Reinforced by Cement and Sodium Silicate under Traffic Loading

Lingshi An (), Junhao Chen, Dongwei Li, Peng Li, Lei Guo and Guanren Chen
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Lingshi An: Key Laboratory of Underground Engineering, Fujian Province University (Fujian University of Technology), Fuzhou 350118, China
Junhao Chen: Key Laboratory of Underground Engineering, Fujian Province University (Fujian University of Technology), Fuzhou 350118, China
Dongwei Li: School of Civil and Architecture Engineering, East China University of Technology, Nanchang 330013, China
Peng Li: School of Civil and Architecture Engineering, East China University of Technology, Nanchang 330013, China
Lei Guo: School of Civil and Architecture Engineering, East China University of Technology, Nanchang 330013, China
Guanren Chen: School of Civil and Architecture Engineering, East China University of Technology, Nanchang 330013, China

Sustainability, 2022, vol. 14, issue 21, 1-14

Abstract: The accumulative strain of sand-containing soft soil is crucial to the stability of the construction of embankment engineering such as expressways and high-speed railways. However, little attention has been devoted to the accumulative strain of sand-containing soft soil. In the current study, a series of cyclic triaxial tests were performed to investigate the accumulative strain of sand-containing soft soil reinforced by cement and sodium silicate under traffic loading. In addition, the accumulative strain model was proposed to describe the characteristic of accumulative strain. The results show that for the specimens with a high sand content (25%, 30%, and 35%), the accumulative strain increases obviously with the increase of the sand content. For the specimen with a cement content of 3%, the accumulative strain increases distinctly with the increasing loading time. The accumulative strain is strongly influenced by confining pressure. When the repeated cyclic stress amplitude is greater than 0.17 kN, the increase rate of accumulative strain is greater. The shorter the curing time is, the greater the accumulative strain is. The calculated results of the accumulative strain model show a good agreement with test data. Hence, the accumulative strain model can better describe the characteristic of accumulative strain.

Keywords: accumulative strain; soft soil; sand content; cement; traffic loading (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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