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Characterization and modeling of the compressive behavior of a granite experiencing thermal damage

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Abstract

In the mining of geothermal resources, understanding the physical and mechanical behavior of a rock with preexisting thermal damage is necessary to control the stability of the mining process. Herein we report mechanical testing results on a granite subjected to eight initial thermal damage conditions. The results indicate that the P-wave velocity, thermal conductivity, and uniaxial compressive strength increase first and then decrease with the increase of initial temperature in the range of 25∼600 °C. The rate characteristics of acoustic emission cumulative energy curve, the compressive deformation process of specimen were divided into four groups, and a uniaxial compressive damage parameter was established to quantify the failure mode from tensile to shear failure with the increase of the initial temperature. A variable-order fractional compressive constitutive model considering initial temperature damage was established. The model was validated with experimental data. The mechanisms of initial damaging temperature and viscosity coefficient on the compressive deformation curves were identified.

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Funding

The work introduced in this paper was supported by the National Natural Science Foundation of China (Nos. 52074299 and 41941018), the Innovation Foundation of Institute for Deep Underground Science and Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing) (No. SKLGDUEK202222).

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All authors contributed to the study conception and design. Material preparation, datacollection and analysis were performed by Chunxiao Li. The first draft of the manuscript was written by Chunxiao Li. Xiaolin Liu and Dejian Li reviewed and edited the work. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Xiaolin Liu or Dejian Li.

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Li, C., Liu, X. & Li, D. Characterization and modeling of the compressive behavior of a granite experiencing thermal damage. Mech Time-Depend Mater (2023). https://doi.org/10.1007/s11043-023-09624-w

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  • DOI: https://doi.org/10.1007/s11043-023-09624-w

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