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<p>The effect of the heat treatment on the failure characteristics of granite was studied by conducting the direct shear test. The used granite specimens were heated to various temperatures (25, 100, 200, 300, 400, 500, and 600&#xa0;°C) and cooled to room temperature naturally. The direct shear strength, deformation, fracturing, and AE signal of the heated granite specimen are investigated. The experimental results indicate that heat treatment can significantly change the mechanical properties of granite. With the increase of the maximum heating temperature, the direct shear strength of the heated granite specimen first increases and then decreases, reaching its peak when the maximum heating temperature is 150&#xa0;°C. A notable observation is the non-monotonic evolution of the stress–strain curve slopes, characterized by an initial increase followed by a subsequent decrease as the maximum heating temperature rises. The thermal treatment demonstrates distinct effects on energy evolution characteristics during granite shear failure across different temperature regimes. When the maximum heating temperature is less than 300&#xa0;°C, the pre-peak accumulated elastic strain energy exhibits a non-monotonic pattern, initially increasing and subsequently decreasing, while the dissipated energy shows an inverse trend. When the maximum heating temperature is higher than 300&#xa0;°C, the accumulated elastic strain energy remains relatively stable. These findings can provide a better understanding of the failure mechanism of heated granite specimens under shear conditions.</p>

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Shear Failure Characteristics and Energy Evolution of Granite after Heat Treatment

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Jianqing Jiang,
  • Fuyang Liu,
  • Shihong Hu,
  • Jipeng Cai

摘要

The effect of the heat treatment on the failure characteristics of granite was studied by conducting the direct shear test. The used granite specimens were heated to various temperatures (25, 100, 200, 300, 400, 500, and 600 °C) and cooled to room temperature naturally. The direct shear strength, deformation, fracturing, and AE signal of the heated granite specimen are investigated. The experimental results indicate that heat treatment can significantly change the mechanical properties of granite. With the increase of the maximum heating temperature, the direct shear strength of the heated granite specimen first increases and then decreases, reaching its peak when the maximum heating temperature is 150 °C. A notable observation is the non-monotonic evolution of the stress–strain curve slopes, characterized by an initial increase followed by a subsequent decrease as the maximum heating temperature rises. The thermal treatment demonstrates distinct effects on energy evolution characteristics during granite shear failure across different temperature regimes. When the maximum heating temperature is less than 300 °C, the pre-peak accumulated elastic strain energy exhibits a non-monotonic pattern, initially increasing and subsequently decreasing, while the dissipated energy shows an inverse trend. When the maximum heating temperature is higher than 300 °C, the accumulated elastic strain energy remains relatively stable. These findings can provide a better understanding of the failure mechanism of heated granite specimens under shear conditions.