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Modified Hoek–Brown failure criterion for anisotropic intact rock under high confining pressures
Abstract The extensively used modified anisotropic Hoek–Brown (H-B) failure criterion often overestimates the rock strength under a confining pressure (σ3) exceeding the uniaxial compressive strength (UCS) of rock. In this study, to rectify this problem, the error term (B1σ32) is added to the modified anisotropic H-B strength criterion. The coefficient (B1) in the error term is determined by introducing the anisotropic parameter (kα), and the rock critical confining pressure is adopted for the separation of brittle and ductile rock behaviors. The relationship between the anisotropic parameter (kα) and joint surface dip angle (α) is also established. A new failure criterion that considers rock anisotropy for predicting the rock strength under a high confining pressure (M-HB-HC) is proposed herein. Analyses reveal that the critical coefficient (n) is dependent of the angle (α) and parameter (kα). The strength predictions for different types of rocks using four failure criteria were compared under four confining pressure conditions. The comparison shows that the M-HB-HC failure criterion has better accuracy than other failure criteria; it can describe the transformation from brittle to ductile behaviors of rock as confining pressures increase. Furthermore, we used discrete element numerical software (3DEC) to conduct nine groups of numerical simulations of triaxial confining pressure tests to verify the accuracy of the criterion. The results of the numerical simulation are in good agreement with the experimental data. The M-HB-HC failure criterion is more suitable for rocks with one set of joint surfaces.
Modified Hoek–Brown failure criterion for anisotropic intact rock under high confining pressures
Abstract The extensively used modified anisotropic Hoek–Brown (H-B) failure criterion often overestimates the rock strength under a confining pressure (σ3) exceeding the uniaxial compressive strength (UCS) of rock. In this study, to rectify this problem, the error term (B1σ32) is added to the modified anisotropic H-B strength criterion. The coefficient (B1) in the error term is determined by introducing the anisotropic parameter (kα), and the rock critical confining pressure is adopted for the separation of brittle and ductile rock behaviors. The relationship between the anisotropic parameter (kα) and joint surface dip angle (α) is also established. A new failure criterion that considers rock anisotropy for predicting the rock strength under a high confining pressure (M-HB-HC) is proposed herein. Analyses reveal that the critical coefficient (n) is dependent of the angle (α) and parameter (kα). The strength predictions for different types of rocks using four failure criteria were compared under four confining pressure conditions. The comparison shows that the M-HB-HC failure criterion has better accuracy than other failure criteria; it can describe the transformation from brittle to ductile behaviors of rock as confining pressures increase. Furthermore, we used discrete element numerical software (3DEC) to conduct nine groups of numerical simulations of triaxial confining pressure tests to verify the accuracy of the criterion. The results of the numerical simulation are in good agreement with the experimental data. The M-HB-HC failure criterion is more suitable for rocks with one set of joint surfaces.
Modified Hoek–Brown failure criterion for anisotropic intact rock under high confining pressures
Wang, Zefan (author) / Qi, Chengzhi (author) / Ban, Liren (author) / Yu, Hang (author) / Wang, Haonan (author) / Fu, Ziming (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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