Particle simulation of thermally-induced rock damage with consideration of temperature-dependent elastic modulus and strength |
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| Institution: | 1. Computational Geosciences Research Centre, Central South University, Changsha 410083, China;2. CSIRO Division of Earth Science and Resource Engineering, P.O. Box 1130, Bentley, WA 6102, Australia;1. MIRARCO – Mining Innovation, Laurentian University, Sudbury, Canada P3E 2C6;2. Bharti School of Engineering, Laurentian University, Sudbury, Canada P3E 2C6;3. Key Laboratory of Ministry of Education for Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110004, China;1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China;2. Department of Energy Systems Engineering, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul 151-744, South Korea;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, PR China;2. State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221008, PR China;1. ENSCI, SPCTS, UMR 7315, F-87000 Limoges, France;2. Univ. Limoges, SPCTS, UMR 7315, F-87000 Limoges, France |
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| Abstract: | Based on the particle simulation method, a thermo-mechanical coupling particle model is proposed for simulating thermally-induced rock damage. In this model, rock material is simulated as an assembly of particles, which are connected to each other through their bonds, in the case of simulating mechanical deformation, but connected to each other through thermal pipes in the case of simulating heat conduction. The main advantages of using this model are that: (1) microscopic parameters of this model can be directly determined from the related macroscopic ones; (2) the temperature-dependent elastic modulus and strength are considered in an explicit manner, so that thermally-induced rock damage can be realistically simulated in a thermo-mechanical coupling problem. The related simulation results from an application example have demonstrated that: (1) the proposed model can produce similar behaviors to those observed in experiments; (2) the final failure is initiated from the outer surface of the testing sample and propagates toward the borehole; (3) microscopic crack initiation and propagation processes can be reasonably simulated at the cooling stage. |
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| Keywords: | Particle simulation method Thermo-mechanical coupling Temperature-dependent elastic modulus and strength Crack initiation and propagation Rock damage |
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