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Abstract <p>The mechanical behavior of fractured rock masses under the operation of hydraulic-mechanical coupling is of enormous practical relevance, and the failure process gives theoretical support for disaster avoidance and mitigation of high hydraulic pressure catastrophes in deep mines. In this study, conventional triaxial compression tests of rock-like materials with single-fissure are carried out under different&#xa0;confining pressures and hydraulic pressures, and a compression-shear fracture criterion is also derived. According to the experimental findings, the peak strength, residual strength, and elastic modulus all degrade with the hydraulic pressure and increase with confining pressure, the mechanical characteristics are at their lowest at the fracture angle of 45°. Meanwhile, the critical hydraulic pressure and initial fracture strength of a single fracture rock mass are established for pure tensile failure, pure shear failure, and compression-shear combinations failure. The link between the stress intensity factor, compression-shear coefficient, hydraulic pressure, confining pressure, and crack angle is also examined in the Zhou qunli compression-shear fracture theory. Finally, based on the energy release theory, the presence of hydraulic pressure intensifies the internal microfracture sprouting and external macrofracture initiation, expansion and penetration of the specimen, which leads to the transformation of elastic release energy to dissipation energy, whereas the confining pressure behaves in the opposite way.</p> Highlights <p><UnorderedList Mark="Bullet"> <ItemContent> <p>Compression-shear fracture criterion for single fracture rock-like materials under hydraulic-mechanical coupling is established, based on the theory of Zhou qunli compression-shear fracture, the relationship between compression-shear coefficient, stress intensity factor and hydraulic pressure, confining pressure and the crack angle is clarified. The presence of hydraulic pressure intensifies the internal microfracture sprouting and external macrofracture cracking, expansion and penetration of the rock, further resulting in a relatively small amount of energy released under the action of far-field stress. The confining pressure plays a facilitating role in the release of energy.</p> </ItemContent> </UnorderedList></p>

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Compression-shear fracture and energy evolution in rock-like materials under hydraulic-mechanical coupling effect

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月15日

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  • Taoying Liu,
  • Yeshan Sheng,
  • Zhanfu Yu,
  • Mengyuan Cui,
  • Qing Li,
  • Weidong huang

摘要

Abstract

The mechanical behavior of fractured rock masses under the operation of hydraulic-mechanical coupling is of enormous practical relevance, and the failure process gives theoretical support for disaster avoidance and mitigation of high hydraulic pressure catastrophes in deep mines. In this study, conventional triaxial compression tests of rock-like materials with single-fissure are carried out under different confining pressures and hydraulic pressures, and a compression-shear fracture criterion is also derived. According to the experimental findings, the peak strength, residual strength, and elastic modulus all degrade with the hydraulic pressure and increase with confining pressure, the mechanical characteristics are at their lowest at the fracture angle of 45°. Meanwhile, the critical hydraulic pressure and initial fracture strength of a single fracture rock mass are established for pure tensile failure, pure shear failure, and compression-shear combinations failure. The link between the stress intensity factor, compression-shear coefficient, hydraulic pressure, confining pressure, and crack angle is also examined in the Zhou qunli compression-shear fracture theory. Finally, based on the energy release theory, the presence of hydraulic pressure intensifies the internal microfracture sprouting and external macrofracture initiation, expansion and penetration of the specimen, which leads to the transformation of elastic release energy to dissipation energy, whereas the confining pressure behaves in the opposite way.

Highlights

Compression-shear fracture criterion for single fracture rock-like materials under hydraulic-mechanical coupling is established, based on the theory of Zhou qunli compression-shear fracture, the relationship between compression-shear coefficient, stress intensity factor and hydraulic pressure, confining pressure and the crack angle is clarified. The presence of hydraulic pressure intensifies the internal microfracture sprouting and external macrofracture cracking, expansion and penetration of the rock, further resulting in a relatively small amount of energy released under the action of far-field stress. The confining pressure plays a facilitating role in the release of energy.