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<p>Understanding the influence of joint characteristics on stress wave propagation within joints is of vital importance for comprehensively evaluating the dynamic mechanical responses of rock masses and ensuring the engineering safety and stability of rock mass structures. However, the effects of the roughness and irregular morphology of joints on the attenuation energy and propagation behavior of stress waves within joints in different rock types remain unclear. Moreover, the transmission coefficients of joints are currently inaccurately determined using the split Hopkinson pressure bar (SHPB) system due to the transmission of stress waves at the bar/specimen interfaces. Therefore, in this study, the geometric morphology of the joint surface, obtained through three-dimensional (3D) laser scanning, was used to prepare artificial jointed rock specimens via 3D rock carving techniques. The propagation characteristics of stress waves in jointed specimens made of marble, granite and sandstone were investigated using the SHPB. During the stress wave propagation, dynamic characteristics and energy consumption of jointed rock specimens with various joint roughness were analyzed. For the same type of rock, the results showed that peak stress, the average elastic modulus of the specimen and the normal stiffness of the joint decrease with increasing joint roughness, while the maximum joint closure increases with the increase of joint roughness. Moreover, joint roughness obviously attenuates the transmitted stress wave and enhances the reflected stress wave and absorbed energy. In addition, a method for the decoupling of the transmission coefficients of two rock/bar interfaces and the joint is developed and verified, and the true transmission coefficient of the joint in the rock-SHPB experiment is obtained. The results indicated that it was observed that the transmission coefficient of stress waves at the joint decreases as joint roughness increases, and the corrected transmission coefficients are significantly higher than those without the correction. The proposed method offers a feasible way to accurately evaluate the transmission coefficient of joint in the rock-SHPB experiment and provides valuable insights into the dynamic behavior of jointed rock masses.</p>

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Stress Wave Propagation and Transmission Coefficients in Jointed Rock Specimens with Various Surface Roughness

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Wei Yao,
  • Zhenguo Lei,
  • Jiaxuan Wang,
  • Lei Zhu,
  • Bangbiao Wu

摘要

Understanding the influence of joint characteristics on stress wave propagation within joints is of vital importance for comprehensively evaluating the dynamic mechanical responses of rock masses and ensuring the engineering safety and stability of rock mass structures. However, the effects of the roughness and irregular morphology of joints on the attenuation energy and propagation behavior of stress waves within joints in different rock types remain unclear. Moreover, the transmission coefficients of joints are currently inaccurately determined using the split Hopkinson pressure bar (SHPB) system due to the transmission of stress waves at the bar/specimen interfaces. Therefore, in this study, the geometric morphology of the joint surface, obtained through three-dimensional (3D) laser scanning, was used to prepare artificial jointed rock specimens via 3D rock carving techniques. The propagation characteristics of stress waves in jointed specimens made of marble, granite and sandstone were investigated using the SHPB. During the stress wave propagation, dynamic characteristics and energy consumption of jointed rock specimens with various joint roughness were analyzed. For the same type of rock, the results showed that peak stress, the average elastic modulus of the specimen and the normal stiffness of the joint decrease with increasing joint roughness, while the maximum joint closure increases with the increase of joint roughness. Moreover, joint roughness obviously attenuates the transmitted stress wave and enhances the reflected stress wave and absorbed energy. In addition, a method for the decoupling of the transmission coefficients of two rock/bar interfaces and the joint is developed and verified, and the true transmission coefficient of the joint in the rock-SHPB experiment is obtained. The results indicated that it was observed that the transmission coefficient of stress waves at the joint decreases as joint roughness increases, and the corrected transmission coefficients are significantly higher than those without the correction. The proposed method offers a feasible way to accurately evaluate the transmission coefficient of joint in the rock-SHPB experiment and provides valuable insights into the dynamic behavior of jointed rock masses.