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Simplified Method for Estimating the Hoek-Brown Constant for Intact Rocks

Shen, Jiayi / Karakus, Murat

Abstract

The constant $m_{i}$ is a fundamental parameter required for the Hoek-Brown (HB) criterion to estimate the strength of rock materials. To calculate $m_{i}$ values, triaxial tests need to be carried out; however, triaxial tests are time-consuming and expensive. In this research, a simplified method is proposed that can estimate $m_{i}$ values using information on rock types and the uniaxial compressive strength (UCS) of intact rocks. To evaluate the reliability of the proposed method, $m_{i}$ values estimated from the proposed method are used in the HB criterion to predict intact rock strength. The predicted intact rock strength is then tested against experimental intact rock strength using existing triaxial tests and tests in the authors’ laboratory. Results from the comparison show that $m_{i}$ values calculated from the proposed method can be used reliably in the HB criterion for estimating intact rock strength when triaxial test data are not available.

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Simplified Method for Estimating the Hoek-Brown Constant for Intact Rocks

Shen, Jiayi / Karakus, Murat

Abstract

The constant $m_{i}$ is a fundamental parameter required for the Hoek-Brown (HB) criterion to estimate the strength of rock materials. To calculate $m_{i}$ values, triaxial tests need to be carried out; however, triaxial tests are time-consuming and expensive. In this research, a simplified method is proposed that can estimate $m_{i}$ values using information on rock types and the uniaxial compressive strength (UCS) of intact rocks. To evaluate the reliability of the proposed method, $m_{i}$ values estimated from the proposed method are used in the HB criterion to predict intact rock strength. The predicted intact rock strength is then tested against experimental intact rock strength using existing triaxial tests and tests in the authors’ laboratory. Results from the comparison show that $m_{i}$ values calculated from the proposed method can be used reliably in the HB criterion for estimating intact rock strength when triaxial test data are not available.

Simplified Method for Estimating the Hoek-Brown Constant for Intact Rocks

Shen, Jiayi / Karakus, Murat

Abstract

The constant $m_{i}$ is a fundamental parameter required for the Hoek-Brown (HB) criterion to estimate the strength of rock materials. To calculate $m_{i}$ values, triaxial tests need to be carried out; however, triaxial tests are time-consuming and expensive. In this research, a simplified method is proposed that can estimate $m_{i}$ values using information on rock types and the uniaxial compressive strength (UCS) of intact rocks. To evaluate the reliability of the proposed method, $m_{i}$ values estimated from the proposed method are used in the HB criterion to predict intact rock strength. The predicted intact rock strength is then tested against experimental intact rock strength using existing triaxial tests and tests in the authors’ laboratory. Results from the comparison show that $m_{i}$ values calculated from the proposed method can be used reliably in the HB criterion for estimating intact rock strength when triaxial test data are not available.

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Title:

Simplified Method for Estimating the Hoek-Brown Constant for Intact Rocks

Contributors:

Shen, Jiayi (author) / Karakus, Murat (author)

Published in:

Journal of Geotechnical and Geoenvironmental Engineering ; 140

Publication date:

2014-03-19

ISSN:

1090-0241 , 1943-5606

DOI:

https://doi.org/10.1061/(ASCE)GT.1943-5606.0001116

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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