Numerical analysis of the dynamic evolution of mining-induced stresses and fractures in multilayered rock strata using continuum-based discrete element methods
In this study, the continuum-based discrete element method (CDEM) was adopted to simulate the evolution of mining-induced stress and fracturing during roadway tunnelling and mining in multilayered heterogeneous rock strata. The CDEM integrates the finite element method (FEM) and the discrete element...
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| Published in | International journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 113; pp. 191 - 210 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Berlin
Elsevier Ltd
01.01.2019
Elsevier BV |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1365-1609 1873-4545 1873-4545 |
| DOI | 10.1016/j.ijrmms.2018.11.014 |
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| Abstract | In this study, the continuum-based discrete element method (CDEM) was adopted to simulate the evolution of mining-induced stress and fracturing during roadway tunnelling and mining in multilayered heterogeneous rock strata. The CDEM integrates the finite element method (FEM) and the discrete element method (DEM) to characterize the mining-induced stress evolution, the discontinuous fractures, separations, and caving that occur in the interfaces between multilayered rock strata. The maximum tensile-stress criterion and the Mohr–Coulomb strength criterion were used to evaluate the tensile and shear failure of the material elements. The CDEM model for rock strata was constructed by employing image processing and reconstruction approaches, using the geometrical and physical parameters that were measured from a real coal mining site. The stress evolution and compression deformation of the roof and floor strata were computed to evaluate the criticality of mining-induced disasters. The constructed model was employed to simulate and analyse the immediate roof collapse, immediate floor bulges, and the compaction of the collapse blocks, as well as the large deformation, separation, and collapse between the immediate roof and the main roof during coal seam mining. It was shown that the proposed method could predict ranges for the caving zone and fracture zone in the rock roofs that were in good agreement with the observation results from the real coal mining site. |
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| AbstractList | In this study, the continuum-based discrete element method (CDEM) was adopted to simulate the evolution of mining-induced stress and fracturing during roadway tunnelling and mining in multilayered heterogeneous rock strata. The CDEM integrates the finite element method (FEM) and the discrete element method (DEM) to characterize the mining-induced stress evolution, the discontinuous fractures, separations, and caving that occur in the interfaces between multilayered rock strata. The maximum tensile-stress criterion and the Mohr–Coulomb strength criterion were used to evaluate the tensile and shear failure of the material elements. The CDEM model for rock strata was constructed by employing image processing and reconstruction approaches, using the geometrical and physical parameters that were measured from a real coal mining site. The stress evolution and compression deformation of the roof and floor strata were computed to evaluate the criticality of mining-induced disasters. The constructed model was employed to simulate and analyse the immediate roof collapse, immediate floor bulges, and the compaction of the collapse blocks, as well as the large deformation, separation, and collapse between the immediate roof and the main roof during coal seam mining. It was shown that the proposed method could predict ranges for the caving zone and fracture zone in the rock roofs that were in good agreement with the observation results from the real coal mining site. |
| Author | Su, Chuanshang Zhang, Dongshuang Wang, Yongliang Ju, Yang Ren, Zhangyu |
| Author_xml | – sequence: 1 givenname: Yang surname: Ju fullname: Ju, Yang email: juy@cumtb.edu.cn organization: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China – sequence: 2 givenname: Yongliang orcidid: 0000-0001-7823-6345 surname: Wang fullname: Wang, Yongliang organization: State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China – sequence: 3 givenname: Chuanshang surname: Su fullname: Su, Chuanshang organization: School of Mechanical & Civil Engineering, China University of Mining and Technology, Beijing 100083, China – sequence: 4 givenname: Dongshuang surname: Zhang fullname: Zhang, Dongshuang organization: Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China – sequence: 5 givenname: Zhangyu surname: Ren fullname: Ren, Zhangyu organization: School of Mechanical & Civil Engineering, China University of Mining and Technology, Beijing 100083, China |
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| Keywords | Multilayered rock strata Mining-induced stress evolution Layer separation Continuum-based discrete element method Caving zone Fracture zone |
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| SubjectTerms | Caving zone Coal Coal mines Coal mining Collapse Compression Compression tests Computer simulation Continuum-based discrete element method Criteria Deformation Disasters Discrete element method Evolution Finite element method Floors Fracture zone Fractures Image processing Image reconstruction Interfaces Layer separation Mathematical models Mining-induced stress evolution Multilayered rock strata Nonlinear programming Numerical analysis Physical properties Roads & highways Rocks Roof failures Strata |
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| Title | Numerical analysis of the dynamic evolution of mining-induced stresses and fractures in multilayered rock strata using continuum-based discrete element methods |
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