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<p>Dynamic viscosity coefficient is an important dynamic property of rocks. Its accurate determination is the prerequisite for exploring the dynamic viscosity of rocks. To investigate the evolution of the dynamic viscosity&#xa0;coefficient of deep rocks under high water pressure and high-stress conditions, a series of impact experiments are first conducted on red sandstone using a self-developed dynamic test system. Then, the analytical expression of the dynamic viscosity coefficient of rocks is derived from the amplitude attenuation coefficient based on the Maxwell model. The test results demonstrate that the amplitude attenuation coefficient varies with harmonic frequency and frequency peaks fall in a range of 8–9&#xa0;kHz. Within this frequency range, the energy consumption of stress wave caused by crack expansion in rock is most pronounced. A frequency range of 8–9&#xa0;kHz is suggested to calculate the dynamic viscosity coefficient. The validation of the suggested method for determining the dynamic viscosity coefficient is verified by comparing the relative errors between the predicted and tested values of dynamic strain. The results demonstrate that the suggested method is feasible. Then, the effects of water pressure and axial static stress on the dynamic viscosity coefficient&#xa0;of the red sandstone are discussed. As the water pressure rises, the dynamic viscosity coefficient tends to increase first and then decrease, while it monotonically decreases with increasing axial static stress. Finally, the mechanism of dynamic viscosity&#xa0;coefficient changing along with water pressure and axial stress is revealed from the view of wave impedance. These insights provide a theoretical foundation for the prevention of water inrush in deep rock engineering.</p>

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Determination and Evolution of Dynamic Viscosity Coefficient of Rock Under High Water Pressure and High-Stress Conditions

  • 期刊论文

  • 发表日期：

    2025年1月15日

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  • Jiefang Jin,
  • Youfeng Xiao,
  • Daoxue Yang,
  • Hao Qian,
  • Huiying Xiong,
  • Xiaowang Peng,
  • Wei Yuan

摘要

Dynamic viscosity coefficient is an important dynamic property of rocks. Its accurate determination is the prerequisite for exploring the dynamic viscosity of rocks. To investigate the evolution of the dynamic viscosity coefficient of deep rocks under high water pressure and high-stress conditions, a series of impact experiments are first conducted on red sandstone using a self-developed dynamic test system. Then, the analytical expression of the dynamic viscosity coefficient of rocks is derived from the amplitude attenuation coefficient based on the Maxwell model. The test results demonstrate that the amplitude attenuation coefficient varies with harmonic frequency and frequency peaks fall in a range of 8–9 kHz. Within this frequency range, the energy consumption of stress wave caused by crack expansion in rock is most pronounced. A frequency range of 8–9 kHz is suggested to calculate the dynamic viscosity coefficient. The validation of the suggested method for determining the dynamic viscosity coefficient is verified by comparing the relative errors between the predicted and tested values of dynamic strain. The results demonstrate that the suggested method is feasible. Then, the effects of water pressure and axial static stress on the dynamic viscosity coefficient of the red sandstone are discussed. As the water pressure rises, the dynamic viscosity coefficient tends to increase first and then decrease, while it monotonically decreases with increasing axial static stress. Finally, the mechanism of dynamic viscosity coefficient changing along with water pressure and axial stress is revealed from the view of wave impedance. These insights provide a theoretical foundation for the prevention of water inrush in deep rock engineering.