A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation
This paper presents a new constitutive model for describing the strain-hardening and strain-softening behaviors of clayey rock. As the conventional Mohr-Coulomb (CMC) criterion has its limitation in the tensile shear region, a modified Mohr-Coulomb (MMC) criterion is proposed for clayey rock by cons...
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Series: | Geofluids |
Online Access: | http://dx.doi.org/10.1155/2020/9853782 |
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doaj-e84fc30343134fc68d83245875c05e862020-11-25T02:06:32ZengHindawi-WileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/98537829853782A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and ValidationShanpo Jia0Zhenyun Zhao1Guojun Wu2Bisheng Wu3Caoxuan Wen4Institute of Unconventional Oil & Gas, Northeast Petroleum University, Daqing 163318, ChinaSchool of Urban Construction, Yangtze University, Jingzhou, 434023 Hubei, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071 Hubei, ChinaState Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, ChinaSchool of Urban Construction, Yangtze University, Jingzhou, 434023 Hubei, ChinaThis paper presents a new constitutive model for describing the strain-hardening and strain-softening behaviors of clayey rock. As the conventional Mohr-Coulomb (CMC) criterion has its limitation in the tensile shear region, a modified Mohr-Coulomb (MMC) criterion is proposed for clayey rock by considering the maximal tensile stress criterion. Based on the results of triaxial tests, a coupled elastoplastic damage (EPD) model, in which the elastic and plastic damage laws are introduced to describe the nonlinear hardening and softening behaviors, respectively, is developed so as to fully describe the mechanical behavior of clayey rock. Starting from the implicit Euler integration algorithm, the stress-strain constitutive relationships and their numerical formulations are deduced for finite element implementation in the commercial package ABAQUS where a user-defined material subroutine (UMAT) is provided for clayey rock. Finally, the proposed model is used to simulate the triaxial tests and the results validate the proposed model and numerical implementation.http://dx.doi.org/10.1155/2020/9853782 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Shanpo Jia Zhenyun Zhao Guojun Wu Bisheng Wu Caoxuan Wen |
spellingShingle |
Shanpo Jia Zhenyun Zhao Guojun Wu Bisheng Wu Caoxuan Wen A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation Geofluids |
author_facet |
Shanpo Jia Zhenyun Zhao Guojun Wu Bisheng Wu Caoxuan Wen |
author_sort |
Shanpo Jia |
title |
A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation |
title_short |
A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation |
title_full |
A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation |
title_fullStr |
A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation |
title_full_unstemmed |
A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation |
title_sort |
coupled elastoplastic damage model for clayey rock and its numerical implementation and validation |
publisher |
Hindawi-Wiley |
series |
Geofluids |
issn |
1468-8115 1468-8123 |
publishDate |
2020-01-01 |
description |
This paper presents a new constitutive model for describing the strain-hardening and strain-softening behaviors of clayey rock. As the conventional Mohr-Coulomb (CMC) criterion has its limitation in the tensile shear region, a modified Mohr-Coulomb (MMC) criterion is proposed for clayey rock by considering the maximal tensile stress criterion. Based on the results of triaxial tests, a coupled elastoplastic damage (EPD) model, in which the elastic and plastic damage laws are introduced to describe the nonlinear hardening and softening behaviors, respectively, is developed so as to fully describe the mechanical behavior of clayey rock. Starting from the implicit Euler integration algorithm, the stress-strain constitutive relationships and their numerical formulations are deduced for finite element implementation in the commercial package ABAQUS where a user-defined material subroutine (UMAT) is provided for clayey rock. Finally, the proposed model is used to simulate the triaxial tests and the results validate the proposed model and numerical implementation. |
url |
http://dx.doi.org/10.1155/2020/9853782 |
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