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<p>Structural planes in high-temperature rock engineering (such as deep tunnels, geothermal systems, and fire response tunnels) exhibit complex mechanical behavior and significant instability risks. However, research on the shear mechanisms of rock structural planes under high-temperature conditions is still limited. To reflect the characteristics of structural planes and the effects of high temperature and load on the damage and deformation failure characteristics of structural planes, yellow sandstone from a geological formation following a tunnel fire is used as the engineering background. Laser engraving technology is employed to replicate the natural yellow sandstone structural planes, and shear tests are conducted on samples treated at 200&#xa0;°C, 400&#xa0;°C, 600&#xa0;°C, and 800&#xa0;°C. Acoustic emission signals are monitored during the shear failure process. The experimental results indicate that as the temperature increases, the shear failure marks on the structural planes decrease, the strength and stiffness performance parameters diminish, and the acoustic emission activity weakens synchronously. With the increase in temperature, the load damage initiation point is delayed, the damage accumulation domain shrinks, and the thermal damage threshold effect significantly enhances after 600&#xa0;°C. The timing coupling between peak shear stress and the sudden increase of acoustic emission energy indicates that the accumulated energy before the peak better reflects the shear strength and failure characteristics of the structural planes. A statistical damage constitutive model combining Weibull distribution and Acoustic emission energy evolution was proposed and validated. This model quantitatively links acoustic emission energy with high-temperature shear damage for the first time. It provides a scientific basis for the evaluation of shear strength and the optimization of disaster prevention strategies in high-temperature rock engineering.</p>

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Shear damage characteristics and model study of yellow sandstone structure surfaces after high-temperature treatment

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Fu Zheng,
  • Annan Jiang,
  • Xinping Guo,
  • Haopeng Jiang

摘要

Structural planes in high-temperature rock engineering (such as deep tunnels, geothermal systems, and fire response tunnels) exhibit complex mechanical behavior and significant instability risks. However, research on the shear mechanisms of rock structural planes under high-temperature conditions is still limited. To reflect the characteristics of structural planes and the effects of high temperature and load on the damage and deformation failure characteristics of structural planes, yellow sandstone from a geological formation following a tunnel fire is used as the engineering background. Laser engraving technology is employed to replicate the natural yellow sandstone structural planes, and shear tests are conducted on samples treated at 200 °C, 400 °C, 600 °C, and 800 °C. Acoustic emission signals are monitored during the shear failure process. The experimental results indicate that as the temperature increases, the shear failure marks on the structural planes decrease, the strength and stiffness performance parameters diminish, and the acoustic emission activity weakens synchronously. With the increase in temperature, the load damage initiation point is delayed, the damage accumulation domain shrinks, and the thermal damage threshold effect significantly enhances after 600 °C. The timing coupling between peak shear stress and the sudden increase of acoustic emission energy indicates that the accumulated energy before the peak better reflects the shear strength and failure characteristics of the structural planes. A statistical damage constitutive model combining Weibull distribution and Acoustic emission energy evolution was proposed and validated. This model quantitatively links acoustic emission energy with high-temperature shear damage for the first time. It provides a scientific basis for the evaluation of shear strength and the optimization of disaster prevention strategies in high-temperature rock engineering.