A macro-micro viscoelastic-plastic constitutive model for saturated frozen soil

被引：33

作者：

Wang, Pan ^{[1
,2
]}

Liu, Enlong ^{[1
,2
,3
]}

Zhi, Bin ^{[4
]}

Song, Bingtang ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Sichuan Univ, Coll Water Resources & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China

[4] Xian Univ Sci & Technol, Sch Architecture & Civil Engn, Xian 710054, Peoples R China

来源：

MECHANICS OF MATERIALS | 2020年 / 147卷

基金：

美国国家科学基金会;

关键词：

Saturated frozen soils; Stress concentration tensor; Viscoelastic-plasticity; Creep constitutive model; Micromechanics method; CREEP MODEL; DEPENDENT BEHAVIOR; YIELD CRITERION; STRESS; ICE; EQUATION;

D O I：

10.1016/j.mechmat.2020.103411

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A macro-micro creep constitutive model of viscoelastic-plastic deformation characteristics for three-phase saturated frozen soils is derived in this paper based on micromechanics, considering the influences of ice content and temperature. First, creep tests of saturated frozen soils are performed, and the mechanism of creep deformation is discussed from a micro perspective. Then, the micro-scale and macro-scale information are connected by establishing a relationship between the macroscopic strain energy rate and strain energy rate of the ice particles, soil matrix, and unfrozen water. The viscoelastic stress tensor for the three phases of materials is derived using the visoelastic correspondence principle and the micromechanics method. Thus, the macro-micro viscoelastic constitutive model for saturated frozen soils is obtained. Based on this analysis, the viscoelastic-plastic constitutive model is further considered for the viscoplastic properties of the soil matrix and ice particles. In addition, the corresponding relationship between viscoplastic and viscoelastic is established based on the "equivalent" method. Therefore, the macro-micro creep constitutive model of viscoelastic-plastic deformation characteristics for three-phase saturated frozen soils is finally derived. The model parameters are determined based on the creep tests of frozen soils and the model is verified using creep test results for saturated frozen soil. It is also determined that the proposed model can illustrate the influence of temperature and ice content on the creep of saturated frozen soils.

引用

页数：14

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