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A Continuous Damage Statistical Constitutive Model for Sandstone and Mudstone Based on Triaxial Compression Tests
Abstract The failure and deformation mechanism of sandstone and mudstone has always been highlighted in research on mining engineering. To further investigate the failure and deformation mechanism of sandstone and mudstone, a damage definition was proposed to describe the failure mechanism of a rock specimen with micro-defects and inhomogeneity; the Weibull distribution function was used to illustrate the dispersion of mechanical properties (i.e. damage extent) of rock; the nonconstant terms of Z–P yield function was employed to describe the strength of rock elements. Based on the framework of the continuum damage mechanics and strain equivalence hypothesis, a continuous damage constitutive model was established. Finally, triaxial compression tests on sandstone and mudstone taken from the Chensilou coal mine were conducted to verify the reliability of the proposed model. The results show that the damage evolution curve presents the shape of a square root sign, The damage evolution of the rock specimens can be divided into six stages: (1) initial damage stage, (2) damage-weakening stage, (3) slight-increased damage stage, (4) rapidly-increased damage stage, (5) rock failure stage and (6) rock slippage stage. The proposed damage evolution contributes to establishing the constitutive model of the stress–strain relationship of sandstone and mudstone in the mining field.
Highlights Processing a continuous damage statistical constitutive model for sandstone and mudstone based on triaxial compression tests.The damage evolution curve presents the shape of a square root sign.The damage evolution of the rock: initial damage-damage weakening-slight increased-rapidly increased-rock failure-rock slippage.
A Continuous Damage Statistical Constitutive Model for Sandstone and Mudstone Based on Triaxial Compression Tests
Abstract The failure and deformation mechanism of sandstone and mudstone has always been highlighted in research on mining engineering. To further investigate the failure and deformation mechanism of sandstone and mudstone, a damage definition was proposed to describe the failure mechanism of a rock specimen with micro-defects and inhomogeneity; the Weibull distribution function was used to illustrate the dispersion of mechanical properties (i.e. damage extent) of rock; the nonconstant terms of Z–P yield function was employed to describe the strength of rock elements. Based on the framework of the continuum damage mechanics and strain equivalence hypothesis, a continuous damage constitutive model was established. Finally, triaxial compression tests on sandstone and mudstone taken from the Chensilou coal mine were conducted to verify the reliability of the proposed model. The results show that the damage evolution curve presents the shape of a square root sign, The damage evolution of the rock specimens can be divided into six stages: (1) initial damage stage, (2) damage-weakening stage, (3) slight-increased damage stage, (4) rapidly-increased damage stage, (5) rock failure stage and (6) rock slippage stage. The proposed damage evolution contributes to establishing the constitutive model of the stress–strain relationship of sandstone and mudstone in the mining field.
Highlights Processing a continuous damage statistical constitutive model for sandstone and mudstone based on triaxial compression tests.The damage evolution curve presents the shape of a square root sign.The damage evolution of the rock: initial damage-damage weakening-slight increased-rapidly increased-rock failure-rock slippage.
A Continuous Damage Statistical Constitutive Model for Sandstone and Mudstone Based on Triaxial Compression Tests
Wu, Lu-yuan (author) / Wang, Zifa (author) / Ma, Dan (author) / Zhang, Jian-wei (author) / Wu, Guangming (author) / Wen, Sen (author) / Zha, Minglei (author) / Wu, Linzi (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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| British Library Conference Proceedings | 1998
Creep behaviour of saturated purple mudstone under triaxial compression
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