Mechanical Properties and Constitutive Model for Artificially Structured Soils under Undrained Conditions

Yi Sun, Enlong Liu (), Jundong Wu and Shuyi Zhang
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Yi Sun: Changjiang Institute of Survey, Planning, Design and Research Corporation, Wuhan 430010, China
Enlong Liu: State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China
Jundong Wu: Changjiang Institute of Survey, Planning, Design and Research Corporation, Wuhan 430010, China
Shuyi Zhang: State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China

Mathematics, 2024, vol. 12, issue 14, 1-18

Abstract: Triaxial tests are performed for remolded, artificially isotropic, and anisotropic structured samples under undrained conditions at confining pressures of 25, 100, and 200 kPa. Based on these test results, a binary-medium constitutive model is formulated based on homogenization theory and a breakage mechanism to describe the behaviors of structured soils. In this model, the binary-medium material is idealized as a representative volume element (RVE) composed of bonded elements, whose mechanical behaviors are expressed by the linearly elastic model, and frictional elements, whose mechanical behaviors are described by the double-yield surfaces constitutive model. The parameters of the bonded and frictional elements are determined from the test results of structured and remolded samples, respectively. The expressions for the breakage ratio and local stress coefficient matrix are introduced, and their parameters are provided. The computed results are compared with the test results, demonstrating that the model can reflect the main deformation features of structured soil relatively well, including the influence of anisotropy, gradual damage to particle bonding, and pore development.

Keywords: artificially structured soils; undrained triaxial tests; binary-medium constitutive model; initially stress-induced anisotropy (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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