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Mechanical Properties and Crack Propagation Behavior of Granite After High Temperature Treatment Based on a Thermo-Mechanical Grain-Based Model

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Abstract

High temperature is an important factor affecting the mechanical properties and crack propagation behavior of granite. In this study, the mechanical properties and thermal damage mechanism of granite after high temperature are studied experimentally. Subsequently, based on the content and distribution of granite minerals, combined with computed tomography (CT) technique and grain-based model (GBM) modeling method, a novel discrete element numerical model considering real mineral distribution is introduced, and the rationality of the method is verified by experiments. On this basis, the mechanical behavior, crack propagation behavior and failure mode of granite after high temperature are studied. The results show that 450 °C is the thermal damage threshold of granite in this study. When T ≤ 450 °C, the development of thermally-induced microcracks is not significant, the P-wave velocity of granite decreases slightly, and the change of mechanical properties is not obvious. When T > 450 °C, the thermally-induced microcrack propagates rapidly, the fracture network and fracture zone are formed locally in the specimen, and the P-wave velocity and mechanical properties of granite deteriorate significantly. The simulation results show that the number of thermally-induced microcracks in granite specimens is positively correlated with temperature, and the tensile cracks are mainly at the mineral boundary, and the thermal stress concentration between mineral particles is the main cause of thermally-induced microcracks. After temperature treatment, there are mainly tensile cracks in granite specimens under uniaxial compression, and the orientation of tensile cracks tends to be isotropic with the increase of temperature. When T < 600 °C, the crack distribution and failure mode of granite specimens under uniaxial compression are consistent with those at room temperature. When T ≥ 600 °C, thermally-induced microcracks begin to dominate the uniaxial compression failure process, and granite specimens begin to show ductile failure characteristics, and the brittle-plastic transition was observed between 600 °C and 750 °C.

Highlights

  • A novel thermo-mechanical grain-based model considering the distribution of real granite minerals is proposed.

  • 450°C is the threshold temperature for thermal damage of granite in this study. When T≥600 °C, thermally-induced microcracks dominate the failure mode of granite, and brittle-plastic transition is observed between 600 °C and 750 °C.

  • The orientation distribution of tensile crack caused by axial load tends to be isotropic with the increase of temperature.

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Acknowledgements

Funding for this work was provided by Natural Science Foundation of China (41941018) and supported by Natural Science Foundation of China (42241145) and supported by the Fundamental Research Funds for the Central Universities (2021JCCXLJ05) and supported by China Postdoctoral Science Foundation (2021M701541) and Science and Technology Innovation Project of Chinese Institute of Coal Science (2021-KXYJ-001).

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Authors and Affiliations

  1. State Key Laboratory for Geo-Mechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China

    Pingye Guo, Mohua Bu, Peng Zhang, Zhaolong Luan & Manchao He

  2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China

    Pingye Guo, Mohua Bu, Peng Zhang, Zhaolong Luan & Manchao He

  3. Deep Mining and Rock Burst Research Institute, Chinese Institute of Coal Science, Beijing, 100013, China

    Jiamin Wang

  4. State Key Laboratory of Coal Mining and Clean Utilization, China Coal Technology and Engineering Group, Beijing, 100013, China

    Jiamin Wang

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  1. Pingye Guo
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Correspondence to Pingye Guo.

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Guo, P., Bu, M., Zhang, P. et al. Mechanical Properties and Crack Propagation Behavior of Granite After High Temperature Treatment Based on a Thermo-Mechanical Grain-Based Model. Rock Mech Rock Eng 56, 6411–6435 (2023). https://doi.org/10.1007/s00603-023-03408-x

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