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Abstract <p>High temperature and high stress conditions present significant challenges for the efficient extraction of deep resources. To investigate the effects of temperature and confining pressure on the mechanical properties and damage mechanisms of shale, triaxial compression tests were conducted under real-time high-temperature and confining pressure coupling conditions using a self-developed high-temperature triaxial rock mechanics testing system. The results show that the high confining pressure induces a transition of shale from brittle to plastic, and an increase in temperature exacerbated this process. Under both low and high confining pressure conditions, peak stress and elastic modulus decrease with increasing temperature. When the temperature exceeds 300°C, the influence of temperature on peak stress and elastic modulus becomes dominant. The failure modes of the specimens are influenced by the coupling effects of confining pressure and temperature, with confining pressure playing a dominant role.</p>

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Mechanical Properties Evolution and Damage Mechanism of Shale under Real-Time High-Temperature Triaxial Stress Conditions

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Wang Yahua,
  • K. A. Motorova

摘要

Abstract

High temperature and high stress conditions present significant challenges for the efficient extraction of deep resources. To investigate the effects of temperature and confining pressure on the mechanical properties and damage mechanisms of shale, triaxial compression tests were conducted under real-time high-temperature and confining pressure coupling conditions using a self-developed high-temperature triaxial rock mechanics testing system. The results show that the high confining pressure induces a transition of shale from brittle to plastic, and an increase in temperature exacerbated this process. Under both low and high confining pressure conditions, peak stress and elastic modulus decrease with increasing temperature. When the temperature exceeds 300°C, the influence of temperature on peak stress and elastic modulus becomes dominant. The failure modes of the specimens are influenced by the coupling effects of confining pressure and temperature, with confining pressure playing a dominant role.