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<p>Beishan granite should serve as host rock for a high-level radioactive waste (HLW) repository in China. The host rock of an HLW repository will be subjected to high crustal stress, elevated temperatures, and significant pore and joint pressure, respectively. This study documents thermo-hydro-mechanical (THM) coupled tests on Beishan granite and provides its properties under these complex conditions. The results indicate that increase in temperature or fluid pressure leads to a strength reduction. However, the extent of strength reduction due to increasing temperature varies with different fluid pressures. Additionally, the mean values of Young’s modulus and Poisson’s ratio exhibit an initial increase followed by a subsequent decrease as temperature rises up to 90&#xa0;°C. Throughout the damage process, it was observed that the amplitudes of acoustic emissions (AE) increase approximately proportional to the decrease in number of AE events. The released AE energy within the amplitude ranges of (45, 50], (50, 55], and (&gt; 60) constitutes the primary contributor to the damage observed in the specimens. To characterize the permeability evolution throughout the entire deformation process of the specimen, a linear exponential relationship between permeability and volumetric strain is established.</p>

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Mechanical properties and permeability evolution of Beishan granite under thermo-hydro-mechanical conditions

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Zihui Wang,
  • Hongwei Zhou,
  • Miao Chen,
  • Heinz Konietzky,
  • Zelin Liu,
  • Guanglei Zhou

摘要

Beishan granite should serve as host rock for a high-level radioactive waste (HLW) repository in China. The host rock of an HLW repository will be subjected to high crustal stress, elevated temperatures, and significant pore and joint pressure, respectively. This study documents thermo-hydro-mechanical (THM) coupled tests on Beishan granite and provides its properties under these complex conditions. The results indicate that increase in temperature or fluid pressure leads to a strength reduction. However, the extent of strength reduction due to increasing temperature varies with different fluid pressures. Additionally, the mean values of Young’s modulus and Poisson’s ratio exhibit an initial increase followed by a subsequent decrease as temperature rises up to 90 °C. Throughout the damage process, it was observed that the amplitudes of acoustic emissions (AE) increase approximately proportional to the decrease in number of AE events. The released AE energy within the amplitude ranges of (45, 50], (50, 55], and (> 60) constitutes the primary contributor to the damage observed in the specimens. To characterize the permeability evolution throughout the entire deformation process of the specimen, a linear exponential relationship between permeability and volumetric strain is established.