### Abstract

Study of intact rock failure criteria is an important topic in rock mechanics. In this study, applicability of nine different intact rock failure criteria is investigated for intact coal strength data. PFC^{3D} modeling was used to simulate the laboratory polyaxial tests for cubic intact coal blocks of side dimension 110 mm under different confining stress combinations. A modified grid search procedure is proposed and used to find the best-fitting parameter values and to calculate the coefficient of determination (R^{2}) values for each criterion. Detailed comparisons of the nine criteria are made using the following aspects: R^{2} values, σ_{1} − σ_{2} plots for different σ_{3}, shapes on the deviatoric plane, linearity or nonlinearity on the meridian planes. Through the comparisons of R^{2} values, σ_{1} − σ_{2} plots and meridian lines, the modified Wiebols–Cook and modified Lade criteria were found to fit the intact coal strength data best. The nine failure criteria are categorized into three types based on the appearances on the deviatoric plane.

Language | English (US) |
---|---|

Pages | 1-27 |

Number of pages | 27 |

Journal | Acta Geotechnica |

DOIs | |

State | Accepted/In press - Jun 17 2017 |

### Fingerprint

### Keywords

- Deviatoric plane
- Failure criteria
- Intact coal strength
- Meridian planes
- PFC modeling

### ASJC Scopus subject areas

- Geotechnical Engineering and Engineering Geology
- Earth and Planetary Sciences (miscellaneous)

### Cite this

^{3D}simulations.

*Acta Geotechnica*, 1-27. DOI: 10.1007/s11440-017-0566-9

**Detailed comparison of nine intact rock failure criteria using polyaxial intact coal strength data obtained through PFC ^{3D} simulations.** / He, Peng fei; Kulatilake, Pinnaduwa H.S.W.; Yang, Xu xu; Liu, Dong qiao; He, Man chao.

Research output: Research - peer-review › Article

^{3D}simulations'

*Acta Geotechnica*, pp. 1-27. DOI: 10.1007/s11440-017-0566-9

^{3D}simulations. Acta Geotechnica. 2017 Jun 17;1-27. Available from, DOI: 10.1007/s11440-017-0566-9

}

TY - JOUR

T1 - Detailed comparison of nine intact rock failure criteria using polyaxial intact coal strength data obtained through PFC3D simulations

AU - He,Peng fei

AU - Kulatilake,Pinnaduwa H.S.W.

AU - Yang,Xu xu

AU - Liu,Dong qiao

AU - He,Man chao

PY - 2017/6/17

Y1 - 2017/6/17

N2 - Study of intact rock failure criteria is an important topic in rock mechanics. In this study, applicability of nine different intact rock failure criteria is investigated for intact coal strength data. PFC3D modeling was used to simulate the laboratory polyaxial tests for cubic intact coal blocks of side dimension 110 mm under different confining stress combinations. A modified grid search procedure is proposed and used to find the best-fitting parameter values and to calculate the coefficient of determination (R2) values for each criterion. Detailed comparisons of the nine criteria are made using the following aspects: R2 values, σ1 − σ2 plots for different σ3, shapes on the deviatoric plane, linearity or nonlinearity on the meridian planes. Through the comparisons of R2 values, σ1 − σ2 plots and meridian lines, the modified Wiebols–Cook and modified Lade criteria were found to fit the intact coal strength data best. The nine failure criteria are categorized into three types based on the appearances on the deviatoric plane.

AB - Study of intact rock failure criteria is an important topic in rock mechanics. In this study, applicability of nine different intact rock failure criteria is investigated for intact coal strength data. PFC3D modeling was used to simulate the laboratory polyaxial tests for cubic intact coal blocks of side dimension 110 mm under different confining stress combinations. A modified grid search procedure is proposed and used to find the best-fitting parameter values and to calculate the coefficient of determination (R2) values for each criterion. Detailed comparisons of the nine criteria are made using the following aspects: R2 values, σ1 − σ2 plots for different σ3, shapes on the deviatoric plane, linearity or nonlinearity on the meridian planes. Through the comparisons of R2 values, σ1 − σ2 plots and meridian lines, the modified Wiebols–Cook and modified Lade criteria were found to fit the intact coal strength data best. The nine failure criteria are categorized into three types based on the appearances on the deviatoric plane.

KW - Deviatoric plane

KW - Failure criteria

KW - Intact coal strength

KW - Meridian planes

KW - PFC modeling

UR - http://www.scopus.com/inward/record.url?scp=85020487864&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020487864&partnerID=8YFLogxK

U2 - 10.1007/s11440-017-0566-9

DO - 10.1007/s11440-017-0566-9

M3 - Article

SP - 1

EP - 27

JO - Acta Geotechnica

T2 - Acta Geotechnica

JF - Acta Geotechnica

SN - 1861-1125

ER -