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Brittle-Ductile Transition and Hoek–Brown $ m_{i} $ Constant of Low-Porosity Carbonate Rocks
https://orcid.org/0000-0002-9864-7878
Abstract The mechanical behavior of low porosity carbonate rocks is investigated by a series of conventional triaxial compression tests performed at room temperature, at various confining pressures up to 70 MPa and at a constant strain rate of 5 × 10 −5 $ s^{−1} $. Aiming at an improvement of the accuracy and quality of the constant $ m_{i} $ of the non-linear Hoek–Brown criterion for jointed rock, four dense, high strength and low-porosity carbonate rocks were tested in conventional triaxial testing, under confining pressures over the entire brittle field, from $ σ_{3} $ = 0 to the brittle-ductile transition. Intact, fresh and dry specimens from limestones and two marbles were tested using a standard NX Hoek triaxial cell. The results indicate that the average brittle-ductile transition pressure and the value of $ m_{i} $ determined by the experimental data over the entire brittle field, were approximately twice as high for limestones as for marbles. With the inclusion of the results from five well-known carbonate rocks published by other researchers, it was found that, for the total number of nine carbonate rocks, the ratio of the critical principal stress ratio at the transition ($ σ_{1} $/$ σ_{3} $) was equal to 5.84 irrespective of rock type, transition pressure, grain size, and $ m_{i} $ value. Moreover, the transition pressure decreases logarithmically with the average rock grain size and the ratio of the transition pressure to the unconfined compressive strength $ σ_{ci} $.
Brittle-Ductile Transition and Hoek–Brown $ m_{i} $ Constant of Low-Porosity Carbonate Rocks
https://orcid.org/0000-0002-9864-7878
Abstract The mechanical behavior of low porosity carbonate rocks is investigated by a series of conventional triaxial compression tests performed at room temperature, at various confining pressures up to 70 MPa and at a constant strain rate of 5 × 10 −5 $ s^{−1} $. Aiming at an improvement of the accuracy and quality of the constant $ m_{i} $ of the non-linear Hoek–Brown criterion for jointed rock, four dense, high strength and low-porosity carbonate rocks were tested in conventional triaxial testing, under confining pressures over the entire brittle field, from $ σ_{3} $ = 0 to the brittle-ductile transition. Intact, fresh and dry specimens from limestones and two marbles were tested using a standard NX Hoek triaxial cell. The results indicate that the average brittle-ductile transition pressure and the value of $ m_{i} $ determined by the experimental data over the entire brittle field, were approximately twice as high for limestones as for marbles. With the inclusion of the results from five well-known carbonate rocks published by other researchers, it was found that, for the total number of nine carbonate rocks, the ratio of the critical principal stress ratio at the transition ($ σ_{1} $/$ σ_{3} $) was equal to 5.84 irrespective of rock type, transition pressure, grain size, and $ m_{i} $ value. Moreover, the transition pressure decreases logarithmically with the average rock grain size and the ratio of the transition pressure to the unconfined compressive strength $ σ_{ci} $.
Brittle-Ductile Transition and Hoek–Brown $ m_{i} $ Constant of Low-Porosity Carbonate Rocks
https://orcid.org/0000-0002-9864-7878
Abstract The mechanical behavior of low porosity carbonate rocks is investigated by a series of conventional triaxial compression tests performed at room temperature, at various confining pressures up to 70 MPa and at a constant strain rate of 5 × 10 −5 $ s^{−1} $. Aiming at an improvement of the accuracy and quality of the constant $ m_{i} $ of the non-linear Hoek–Brown criterion for jointed rock, four dense, high strength and low-porosity carbonate rocks were tested in conventional triaxial testing, under confining pressures over the entire brittle field, from $ σ_{3} $ = 0 to the brittle-ductile transition. Intact, fresh and dry specimens from limestones and two marbles were tested using a standard NX Hoek triaxial cell. The results indicate that the average brittle-ductile transition pressure and the value of $ m_{i} $ determined by the experimental data over the entire brittle field, were approximately twice as high for limestones as for marbles. With the inclusion of the results from five well-known carbonate rocks published by other researchers, it was found that, for the total number of nine carbonate rocks, the ratio of the critical principal stress ratio at the transition ($ σ_{1} $/$ σ_{3} $) was equal to 5.84 irrespective of rock type, transition pressure, grain size, and $ m_{i} $ value. Moreover, the transition pressure decreases logarithmically with the average rock grain size and the ratio of the transition pressure to the unconfined compressive strength $ σ_{ci} $.
Brittle-Ductile Transition and Hoek–Brown $ m_{i} $ Constant of Low-Porosity Carbonate Rocks
Tsikrikis, Anastasios (author) / Papaliangas, Theodosios (author) / Marinos, Vassilis (author)
2021
Article (Journal)
Electronic Resource
English
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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