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Evolution of Physical and Mechanical Properties of Granite after Thermal Treatment under Cyclic Uniaxial Compression

Author

Listed:
  • Bo Hu

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Xiangqi Hu

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Chenggeng Lin

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Guangzhen Du

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Tianxing Ma

    (Ocean College, Zhejiang University, Zhoushan 316021, China)

  • Kaihui Li

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

Abstract

The combined effects of thermal and cyclic loading result in complex mechanical behavior in engineering rock masses. The study of the physical and mechanical properties of these rock masses is of great importance for improving the stability and sustainability of structures built on thermally treated rock masses. In order to understand the failure mechanism, uniaxial compression tests and cyclic loading and unloading tests were conducted on granite specimens that had undergone thermal treatment at various temperatures. The test results indicate that the density and P-wave velocity of the specimens decrease while the degree of damage increases after thermal treatment. The compressive strength and elastic modulus of the specimens generally decrease as a result of thermal treatment, although thermal hardening does occur within the temperature range of 200–400 °C. The dilatancy characteristics of the specimens change with the treatment temperature, and they are more prone to shear dilation under external loading. Furthermore, the failure mode of the specimens transitions from brittle to ductile failure as the treatment temperature increases. The combination of thermal treatment and cyclic loading causes the rock fragments to become looser and finer following specimen failure.

Suggested Citation

  • Bo Hu & Xiangqi Hu & Chenggeng Lin & Guangzhen Du & Tianxing Ma & Kaihui Li, 2023. "Evolution of Physical and Mechanical Properties of Granite after Thermal Treatment under Cyclic Uniaxial Compression," Sustainability, MDPI, vol. 15(18), pages 1-22, September.
  • Handle: RePEc:gam:jsusta:v:15:y:2023:i:18:p:13676-:d:1238991
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    References listed on IDEAS

    as
    1. Wei Chen & Wen Wan & Yanlin Zhao & Wenqing Peng, 2020. "Experimental Study of the Crack Predominance of Rock-Like Material Containing Parallel Double Fissures under Uniaxial Compression," Sustainability, MDPI, vol. 12(12), pages 1-19, June.
    2. Zhigang Yuan & Jintao Zhao & Shuqing Li & Zehua Jiang & Fei Huang, 2022. "A Unified Solution for Surrounding Rock of Roadway Considering Seepage, Dilatancy, Strain-Softening and Intermediate Principal Stress," Sustainability, MDPI, vol. 14(13), pages 1-18, July.
    3. Hai Wu & Qian Jia & Weijun Wang & Nong Zhang & Yiming Zhao, 2021. "Experimental Test on Nonuniform Deformation in the Tilted Strata of a Deep Coal Mine," Sustainability, MDPI, vol. 13(23), pages 1-14, November.
    4. Rafał Moska & Krzysztof Labus & Piotr Kasza, 2021. "Hydraulic Fracturing in Enhanced Geothermal Systems—Field, Tectonic and Rock Mechanics Conditions—A Review," Energies, MDPI, vol. 14(18), pages 1-24, September.
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