A creep constitutive model for heterogeneous frozen clay soil considering the damage of cryostructure

Author:

Shi Sheng123,Zhang Feng4,Feng Decheng4

Affiliation:

1. College of Civil Engineering and Architecture Zhejiang University Hangzhou PR China

2. Center for Balance Architecture Zhejiang University Hangzhou PR China

3. Architectural Design and Research Institute Zhejiang University Hangzhou PR China

4. School of Transportation Science and Engineering Harbin Institute of Technology Harbin PR China

Abstract

AbstractIn cold regions, the creep behavior of frozen soil is a crucial indicator for evaluating the stability of engineering foundations. The creep properties of frozen soil are more complex than unfrozen soil owing to its special cryogenic structures. In this research, a series of creep tests were conducted on the heterogeneous frozen clay soil under different deviatoric stresses, and the influence of deviatoric stress and structural features on its creep behaviors were analyzed. Based on the test results and fracture mechanics, the damage variable of heterogeneous frozen clay soil considering the effect of cryostructure was defined, and the sensitivity of parameters in damage variable were analyzed. By introducing the hardening variable and damage variable into the classical Nishihara model, a new creep constitutive model for heterogeneous frozen clay soil considering the fracture of cryostructure was established, the validity of the model was verified using test results, and the model parameters were analyzed.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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