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Numerical Simulation Study on Crack Evolution Characteristics of Coal Specimen Subjected to Conventional Compression Loading
https://orcid.org/0000-0001-7443-888X
https://orcid.org/0000-0002-0202-0764
Abstract The paper represents a simulation investigation about the crack evolution and acoustic emission characteristics of coal specimen subjected to conventional compression loading with four confining pressures. From the simulation tests, the following conclusions can be drawn. (1) Under the confining pressure of 0.5, 1.0 and 1.5 MPa, at the stress peak point, the number of total cracks in coal specimen are 3.33, 4.28 and 4.50 times of that under uniaxial stress state, respectively. That is, with the increase of confining pressure, the number of total cracks at coal specimen failure gradually increases, but the increase rate gradually decreases. (2) Under the confining pressure of 0, 0.5, 1.0 and 1.5 MPa, at the stress peak point, the proportion of tensile cracks in the total cracks decreases from 100% to 95.95%, and the proportion of shear cracks increases from 0 to 4.05%. These show that with the increase of confining pressure, the coal specimen presents a transition trend from tensile failure to shear failure. (3) When the confining pressure is less than 1.0 MPa, the confining pressure has an obvious effect on the crack distribution of coal specimen subjected to conventional compression loading, but when the confining pressure exceeds 1.0 MPa, this effect gradually weakens. (4) The maximum value of acoustic emission impact counts slightly lags behind the time point corresponding to the peak strength, namely, the coal specimen is destroyed at some point in the post-peak phase.
Numerical Simulation Study on Crack Evolution Characteristics of Coal Specimen Subjected to Conventional Compression Loading
https://orcid.org/0000-0001-7443-888X
https://orcid.org/0000-0002-0202-0764
Abstract The paper represents a simulation investigation about the crack evolution and acoustic emission characteristics of coal specimen subjected to conventional compression loading with four confining pressures. From the simulation tests, the following conclusions can be drawn. (1) Under the confining pressure of 0.5, 1.0 and 1.5 MPa, at the stress peak point, the number of total cracks in coal specimen are 3.33, 4.28 and 4.50 times of that under uniaxial stress state, respectively. That is, with the increase of confining pressure, the number of total cracks at coal specimen failure gradually increases, but the increase rate gradually decreases. (2) Under the confining pressure of 0, 0.5, 1.0 and 1.5 MPa, at the stress peak point, the proportion of tensile cracks in the total cracks decreases from 100% to 95.95%, and the proportion of shear cracks increases from 0 to 4.05%. These show that with the increase of confining pressure, the coal specimen presents a transition trend from tensile failure to shear failure. (3) When the confining pressure is less than 1.0 MPa, the confining pressure has an obvious effect on the crack distribution of coal specimen subjected to conventional compression loading, but when the confining pressure exceeds 1.0 MPa, this effect gradually weakens. (4) The maximum value of acoustic emission impact counts slightly lags behind the time point corresponding to the peak strength, namely, the coal specimen is destroyed at some point in the post-peak phase.
Numerical Simulation Study on Crack Evolution Characteristics of Coal Specimen Subjected to Conventional Compression Loading
https://orcid.org/0000-0001-7443-888X
https://orcid.org/0000-0002-0202-0764
Abstract The paper represents a simulation investigation about the crack evolution and acoustic emission characteristics of coal specimen subjected to conventional compression loading with four confining pressures. From the simulation tests, the following conclusions can be drawn. (1) Under the confining pressure of 0.5, 1.0 and 1.5 MPa, at the stress peak point, the number of total cracks in coal specimen are 3.33, 4.28 and 4.50 times of that under uniaxial stress state, respectively. That is, with the increase of confining pressure, the number of total cracks at coal specimen failure gradually increases, but the increase rate gradually decreases. (2) Under the confining pressure of 0, 0.5, 1.0 and 1.5 MPa, at the stress peak point, the proportion of tensile cracks in the total cracks decreases from 100% to 95.95%, and the proportion of shear cracks increases from 0 to 4.05%. These show that with the increase of confining pressure, the coal specimen presents a transition trend from tensile failure to shear failure. (3) When the confining pressure is less than 1.0 MPa, the confining pressure has an obvious effect on the crack distribution of coal specimen subjected to conventional compression loading, but when the confining pressure exceeds 1.0 MPa, this effect gradually weakens. (4) The maximum value of acoustic emission impact counts slightly lags behind the time point corresponding to the peak strength, namely, the coal specimen is destroyed at some point in the post-peak phase.
Numerical Simulation Study on Crack Evolution Characteristics of Coal Specimen Subjected to Conventional Compression Loading
Yu, Weibo (Autor:in) / Duan, Huiqiang (Autor:in)
2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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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