Numerical Simulation Analysis of Mechanical Properties on Rock Brittle–Ductility Transformation Under Different Loading Rates
At present, a large number of physical tests and numerical simulations have been carried out to study the effect of confining pressure on rock deformation mechanism, and some achievements have been achieved; however, the mechanism of rock deformation in actual mine engineering needs to be further st...
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Frontiers Media S.A.
2022-07-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.825229/full |
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| author | Zhichao Tian Zhichao Tian Chunan Tang Chunan Tang Chaoyun Yu Yejiao Liu Shijiang Chen Yun Jin |
| author_facet | Zhichao Tian Zhichao Tian Chunan Tang Chunan Tang Chaoyun Yu Yejiao Liu Shijiang Chen Yun Jin |
| author_sort | Zhichao Tian |
| collection | DOAJ |
| description | At present, a large number of physical tests and numerical simulations have been carried out to study the effect of confining pressure on rock deformation mechanism, and some achievements have been achieved; however, the mechanism of rock deformation in actual mine engineering needs to be further studied, for example, rock-burst is actually a unilateral unloading process of rock mass, and this process can not be completed by physical test. RFPA3D was used to simulate the brittle–ductility transformation mechanical properties of rock under different confining pressures in this paper. The damage constitutive equation of rock was derived from continuum damage mechanics; the damage coefficients of different rocks were determined based on the numerical results of stress acoustic emission, so the correctness of rock damage constitutive equation was verified. According to the derived brittle–ductility damage equation and the fitting results of ductility cumulative damage data, it was found that the development trend of rock brittleness stage was almost the same, and the extended separation occurred after entering ductility stage. The larger the Poisson’s ratio was, the longer the ductility stage was. The smaller the Poisson’s ratio was, the shorter the ductility stage was, but the larger the bearing capacity was. At the late loading stage, the ductility cumulative damage of rock showed a linear upward trend, the bearing capacity sharply decreased, the rock stability failure occurred, and the ductility damage coefficient increased gradually. The study on the brittle–ductile mechanical properties of rocks can help to deep mine’s rock-burst prediction and prevention and has significant engineering significance. |
| first_indexed | 2024-04-13T03:28:59Z |
| format | Article |
| id | doaj.art-fc9e6ad25f63429f8ae628cc5973e806 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-13T03:28:59Z |
| publishDate | 2022-07-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj.art-fc9e6ad25f63429f8ae628cc5973e8062022-12-22T03:04:34ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-07-011010.3389/feart.2022.825229825229Numerical Simulation Analysis of Mechanical Properties on Rock Brittle–Ductility Transformation Under Different Loading RatesZhichao Tian0Zhichao Tian1Chunan Tang2Chunan Tang3Chaoyun Yu4Yejiao Liu5Shijiang Chen6Yun Jin7School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang, ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang, ChinaDalian University of Technology, Dalian, ChinaSchool of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, ChinaCollege of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou, ChinaCollege of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou, ChinaSchool of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, ChinaAt present, a large number of physical tests and numerical simulations have been carried out to study the effect of confining pressure on rock deformation mechanism, and some achievements have been achieved; however, the mechanism of rock deformation in actual mine engineering needs to be further studied, for example, rock-burst is actually a unilateral unloading process of rock mass, and this process can not be completed by physical test. RFPA3D was used to simulate the brittle–ductility transformation mechanical properties of rock under different confining pressures in this paper. The damage constitutive equation of rock was derived from continuum damage mechanics; the damage coefficients of different rocks were determined based on the numerical results of stress acoustic emission, so the correctness of rock damage constitutive equation was verified. According to the derived brittle–ductility damage equation and the fitting results of ductility cumulative damage data, it was found that the development trend of rock brittleness stage was almost the same, and the extended separation occurred after entering ductility stage. The larger the Poisson’s ratio was, the longer the ductility stage was. The smaller the Poisson’s ratio was, the shorter the ductility stage was, but the larger the bearing capacity was. At the late loading stage, the ductility cumulative damage of rock showed a linear upward trend, the bearing capacity sharply decreased, the rock stability failure occurred, and the ductility damage coefficient increased gradually. The study on the brittle–ductile mechanical properties of rocks can help to deep mine’s rock-burst prediction and prevention and has significant engineering significance.https://www.frontiersin.org/articles/10.3389/feart.2022.825229/fullconfining pressureloading ratebrittle–ductilityRFPA3Dnumerical simulation |
| spellingShingle | Zhichao Tian Zhichao Tian Chunan Tang Chunan Tang Chaoyun Yu Yejiao Liu Shijiang Chen Yun Jin Numerical Simulation Analysis of Mechanical Properties on Rock Brittle–Ductility Transformation Under Different Loading Rates Frontiers in Earth Science confining pressure loading rate brittle–ductility RFPA3D numerical simulation |
| title | Numerical Simulation Analysis of Mechanical Properties on Rock Brittle–Ductility Transformation Under Different Loading Rates |
| title_full | Numerical Simulation Analysis of Mechanical Properties on Rock Brittle–Ductility Transformation Under Different Loading Rates |
| title_fullStr | Numerical Simulation Analysis of Mechanical Properties on Rock Brittle–Ductility Transformation Under Different Loading Rates |
| title_full_unstemmed | Numerical Simulation Analysis of Mechanical Properties on Rock Brittle–Ductility Transformation Under Different Loading Rates |
| title_short | Numerical Simulation Analysis of Mechanical Properties on Rock Brittle–Ductility Transformation Under Different Loading Rates |
| title_sort | numerical simulation analysis of mechanical properties on rock brittle ductility transformation under different loading rates |
| topic | confining pressure loading rate brittle–ductility RFPA3D numerical simulation |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.825229/full |
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