Investigating the shear band of methane hydrate-bearing sediments by FEM with an elasto-plastic constitutive model

被引：17

作者：

Jiang, Mingjing ^{[1
,2
,3
]}

Liu, Jun ^{[2
,3
]}

Shen, Zhifu ^{[2
,3
]}

机构：

[1] Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China

[2] Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, Shanghai 200092, Peoples R China

[3] Tongji Univ, Dept Geotech Engn, Coll Civil Engn, Shanghai 200092, Peoples R China

来源：

BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT | 2018年 / 77卷 / 03期

关键词：

Constitutive model; Methane hydrate-bearing sediments; Shear band; Triaxial test; GAS-HYDRATE; STRAIN LOCALIZATION; MECHANICAL-BEHAVIOR; GRANULAR-MATERIALS; COSSERAT CONTINUUM; SAND; DISSOCIATION; DEFORMATION; MEDIA; FORMULATION;

D O I：

10.1007/s10064-017-1109-1

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In order to investigate the formation of the shear band in methane hydrate-bearing sediments (MHBS), an elasto-plastic constitutive model was proposed and implemented into a FEM software Abaqus. After verification of the model implementation by UMAT, a series of biaxial compression test simulations on MHBS samples were performed. Then. the verified UMAT was adopted to simulate the characteristics of the shear band of the MHBS samples, and the 'weak element' was set in the MHBS samples to simulate the influence of nonuniform density on the deformation behavior of the MHBS. Finally, the simulation results were analysed, with emphasis on the characteristics of the shear band. The results showed that: (1) during the test, the shear band coalesces through the 'weak element' and the inclination of the shear band is 48A degrees; (2) the presence of the shear band is the forerunner of element destruction; (3) the shear band occurs before the peak shear strength and the width of the shear band grows larger during loading; and (4) the bifurcation of the stress and volumetric response of elements within the shear band is more obvious during the tests.

引用

页码：1015 / 1025

页数：11

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