Study of rock bending failure mechanism based on a proposed damage model

Hamed Molladavoodi, Ali Mortazavi

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The dominant causes of irreversible rock deformations are damage process and plastic flow. Most of the existing elastic-plastic models employed in the analysis and design of rock structures only consider the plastic flow and ignore the full damage process. The common plastic models used to simulate the rock failure, does not model the rock realistically and often the important issues such as stiffness degradation, softening, and significant differences in rock response under tensile and compressive loadings are ignored. In the definition of rock damage yield function, many authors considered only the tensile microcracking. Since quasi brittle materials such as rock degrade under tensile and shear microcracking, separate positive and negative damage yield functions were introduced. The proposed damage yield functions are formulated in the framework of a damage model which was coded in C++ environment and implemented into a commercial code. Accordingly, the proposed model was applied to the simulation of brittle rocks behavior. The three point load bending test of a brittle rock was simulated numerically and numerical findings were presented. The analysis results show a very good match between numerical and experimental observation especially in the post-elastic region.

Original languageEnglish
Title of host publicationConstitutive Modeling of Geomaterials
Subtitle of host publicationAdvances and New Applications
PublisherSpringer Verlag
Pages349-358
Number of pages10
ISBN (Print)9783642328138
Publication statusPublished - Jan 1 2013
Externally publishedYes

Publication series

NameSpringer Series in Geomechanics and Geoengineering
ISSN (Print)1866-8755
ISSN (Electronic)1866-8763

Fingerprint

failure mechanism
Rocks
damage
rock
plastic flow
Microcracking
Plastic flow
plastic
Plastics
Bending tests
Brittleness
softening
stiffness
Stiffness
Degradation

Keywords

  • Damage yield function
  • Rock damage
  • Strain softening

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Mechanics of Materials

Cite this

Molladavoodi, H., & Mortazavi, A. (2013). Study of rock bending failure mechanism based on a proposed damage model. In Constitutive Modeling of Geomaterials: Advances and New Applications (pp. 349-358). (Springer Series in Geomechanics and Geoengineering). Springer Verlag.

Study of rock bending failure mechanism based on a proposed damage model. / Molladavoodi, Hamed; Mortazavi, Ali.

Constitutive Modeling of Geomaterials: Advances and New Applications. Springer Verlag, 2013. p. 349-358 (Springer Series in Geomechanics and Geoengineering).

Research output: Chapter in Book/Report/Conference proceedingChapter

Molladavoodi, H & Mortazavi, A 2013, Study of rock bending failure mechanism based on a proposed damage model. in Constitutive Modeling of Geomaterials: Advances and New Applications. Springer Series in Geomechanics and Geoengineering, Springer Verlag, pp. 349-358.
Molladavoodi H, Mortazavi A. Study of rock bending failure mechanism based on a proposed damage model. In Constitutive Modeling of Geomaterials: Advances and New Applications. Springer Verlag. 2013. p. 349-358. (Springer Series in Geomechanics and Geoengineering).
Molladavoodi, Hamed ; Mortazavi, Ali. / Study of rock bending failure mechanism based on a proposed damage model. Constitutive Modeling of Geomaterials: Advances and New Applications. Springer Verlag, 2013. pp. 349-358 (Springer Series in Geomechanics and Geoengineering).
@inbook{3bd38e00da8d4533a1842c4760e1516c,
title = "Study of rock bending failure mechanism based on a proposed damage model",
abstract = "The dominant causes of irreversible rock deformations are damage process and plastic flow. Most of the existing elastic-plastic models employed in the analysis and design of rock structures only consider the plastic flow and ignore the full damage process. The common plastic models used to simulate the rock failure, does not model the rock realistically and often the important issues such as stiffness degradation, softening, and significant differences in rock response under tensile and compressive loadings are ignored. In the definition of rock damage yield function, many authors considered only the tensile microcracking. Since quasi brittle materials such as rock degrade under tensile and shear microcracking, separate positive and negative damage yield functions were introduced. The proposed damage yield functions are formulated in the framework of a damage model which was coded in C++ environment and implemented into a commercial code. Accordingly, the proposed model was applied to the simulation of brittle rocks behavior. The three point load bending test of a brittle rock was simulated numerically and numerical findings were presented. The analysis results show a very good match between numerical and experimental observation especially in the post-elastic region.",
keywords = "Damage yield function, Rock damage, Strain softening",
author = "Hamed Molladavoodi and Ali Mortazavi",
year = "2013",
month = "1",
day = "1",
language = "English",
isbn = "9783642328138",
series = "Springer Series in Geomechanics and Geoengineering",
publisher = "Springer Verlag",
pages = "349--358",
booktitle = "Constitutive Modeling of Geomaterials",
address = "Germany",

}

TY - CHAP

T1 - Study of rock bending failure mechanism based on a proposed damage model

AU - Molladavoodi, Hamed

AU - Mortazavi, Ali

PY - 2013/1/1

Y1 - 2013/1/1

N2 - The dominant causes of irreversible rock deformations are damage process and plastic flow. Most of the existing elastic-plastic models employed in the analysis and design of rock structures only consider the plastic flow and ignore the full damage process. The common plastic models used to simulate the rock failure, does not model the rock realistically and often the important issues such as stiffness degradation, softening, and significant differences in rock response under tensile and compressive loadings are ignored. In the definition of rock damage yield function, many authors considered only the tensile microcracking. Since quasi brittle materials such as rock degrade under tensile and shear microcracking, separate positive and negative damage yield functions were introduced. The proposed damage yield functions are formulated in the framework of a damage model which was coded in C++ environment and implemented into a commercial code. Accordingly, the proposed model was applied to the simulation of brittle rocks behavior. The three point load bending test of a brittle rock was simulated numerically and numerical findings were presented. The analysis results show a very good match between numerical and experimental observation especially in the post-elastic region.

AB - The dominant causes of irreversible rock deformations are damage process and plastic flow. Most of the existing elastic-plastic models employed in the analysis and design of rock structures only consider the plastic flow and ignore the full damage process. The common plastic models used to simulate the rock failure, does not model the rock realistically and often the important issues such as stiffness degradation, softening, and significant differences in rock response under tensile and compressive loadings are ignored. In the definition of rock damage yield function, many authors considered only the tensile microcracking. Since quasi brittle materials such as rock degrade under tensile and shear microcracking, separate positive and negative damage yield functions were introduced. The proposed damage yield functions are formulated in the framework of a damage model which was coded in C++ environment and implemented into a commercial code. Accordingly, the proposed model was applied to the simulation of brittle rocks behavior. The three point load bending test of a brittle rock was simulated numerically and numerical findings were presented. The analysis results show a very good match between numerical and experimental observation especially in the post-elastic region.

KW - Damage yield function

KW - Rock damage

KW - Strain softening

UR - http://www.scopus.com/inward/record.url?scp=84902579058&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84902579058&partnerID=8YFLogxK

M3 - Chapter

SN - 9783642328138

T3 - Springer Series in Geomechanics and Geoengineering

SP - 349

EP - 358

BT - Constitutive Modeling of Geomaterials

PB - Springer Verlag

ER -