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<p>This study investigates the damage and degradation behavior of granite subjected to single and circulating thermal shock under different cooling methods. The cylindrical granite specimens were heated to temperatures of 200, 400, 600, and 800&#xa0;°C, followed by cooling using three distinct methods: water cooling, air cooling, and furnace cooling. Both single and cyclic thermal treatments were conducted, and uniaxial compression tests were performed to evaluate the mechanical responses. The stress–strain behavior, uniaxial compressive strength (UCS), failure modes, and surface strain evolution were analyzed. The results indicate that both temperature and cooling method significantly influence the mechanical properties of granite. The UCS exhibits a nonlinear decline with increasing temperature, with 600&#xa0;°C identified as a critical threshold. Below this temperature, the cooling method plays a dominant role, whereas above it, the mineral phase transformation governs strength degradation. The cyclic thermal shock exacerbates damage accumulation, particularly in water-cooled specimens, where the UCS at 800&#xa0;°C drops to only 0.29&#xa0;MPa. Digital image correlation (DIC) analysis reveals that the strain localization becomes more pronounced under higher temperatures and cyclic high temperature treatment conditions, with cooling method affecting crack propagation patterns. This study provides valuable insights into the thermal–mechanical behavior of granite, offering a guidance for engineering applications involving high-temperature rock masses, such as geothermal energy extraction and nuclear waste disposal.</p>

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Study on Damage and Degradation of Granite Subjected to Single/Cycle Thermal Shock and Various Cooling Methods

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Shuailong Lian,
  • Xiaobing Yan,
  • Jingjing Huang,
  • Jiaxing Yang,
  • Xuan Li,
  • Chuang Xiong

摘要

This study investigates the damage and degradation behavior of granite subjected to single and circulating thermal shock under different cooling methods. The cylindrical granite specimens were heated to temperatures of 200, 400, 600, and 800 °C, followed by cooling using three distinct methods: water cooling, air cooling, and furnace cooling. Both single and cyclic thermal treatments were conducted, and uniaxial compression tests were performed to evaluate the mechanical responses. The stress–strain behavior, uniaxial compressive strength (UCS), failure modes, and surface strain evolution were analyzed. The results indicate that both temperature and cooling method significantly influence the mechanical properties of granite. The UCS exhibits a nonlinear decline with increasing temperature, with 600 °C identified as a critical threshold. Below this temperature, the cooling method plays a dominant role, whereas above it, the mineral phase transformation governs strength degradation. The cyclic thermal shock exacerbates damage accumulation, particularly in water-cooled specimens, where the UCS at 800 °C drops to only 0.29 MPa. Digital image correlation (DIC) analysis reveals that the strain localization becomes more pronounced under higher temperatures and cyclic high temperature treatment conditions, with cooling method affecting crack propagation patterns. This study provides valuable insights into the thermal–mechanical behavior of granite, offering a guidance for engineering applications involving high-temperature rock masses, such as geothermal energy extraction and nuclear waste disposal.