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<p>Rockburst is a severe dynamic hazard in deep underground engineering, and temperature plays a crucial role in its occurrence. To examine the effect of thermal damage on sandstone rockburst behavior, true triaxial impact tests were conducted on specimens heated to 25–600&#xa0;°C. The variations in stress, acoustic emission, and energy were recorded to analyze the mechanical response and energy evolution during failure. The experimental results show that: (1) Both peak stress and pre-peak elastic strain energy increase first and then decrease with temperature, reaching a maximum at about 300&#xa0;°C. Moderate heating enhances strength and brittleness, promoting elastic energy accumulation prior to failure; (2) The post-peak energy release rate follows the same trend, indicating that both the amount of stored energy and the rate of its release jointly determine rockburst intensity. The most abrupt post-peak energy release is observed within the temperature range of 200–300&#xa0;°C; (3) When the temperature exceeds 400&#xa0;°C, extensive thermal cracking and mineral decomposition significantly reduce the rock’s strength and energy storage capacity, leading to weaker and more ductile failure. A critical temperature range of 200–300&#xa0;°C is identified, within which sandstone shows the highest energy release efficiency and rockburst proneness. These findings provide insight into the thermal–mechanical mechanism of rockburst and guidance for its prevention in high-temperature underground engineering.</p>

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Influence of Thermal Damage on the Energy Accumulation and Release Characteristics of Sandstone during Impact Rockburst

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Dongqiao Liu,
  • Kai Gu,
  • Guangtian Wang,
  • Senyu Zhang,
  • Sijie Wang

摘要

Rockburst is a severe dynamic hazard in deep underground engineering, and temperature plays a crucial role in its occurrence. To examine the effect of thermal damage on sandstone rockburst behavior, true triaxial impact tests were conducted on specimens heated to 25–600 °C. The variations in stress, acoustic emission, and energy were recorded to analyze the mechanical response and energy evolution during failure. The experimental results show that: (1) Both peak stress and pre-peak elastic strain energy increase first and then decrease with temperature, reaching a maximum at about 300 °C. Moderate heating enhances strength and brittleness, promoting elastic energy accumulation prior to failure; (2) The post-peak energy release rate follows the same trend, indicating that both the amount of stored energy and the rate of its release jointly determine rockburst intensity. The most abrupt post-peak energy release is observed within the temperature range of 200–300 °C; (3) When the temperature exceeds 400 °C, extensive thermal cracking and mineral decomposition significantly reduce the rock’s strength and energy storage capacity, leading to weaker and more ductile failure. A critical temperature range of 200–300 °C is identified, within which sandstone shows the highest energy release efficiency and rockburst proneness. These findings provide insight into the thermal–mechanical mechanism of rockburst and guidance for its prevention in high-temperature underground engineering.