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<p>In deep underground engineering, rock masses under true three-dimensional stress are vulnerable to stress waves from excavation and other dynamic activities, leading to instability and failure along weak joint planes. Current research focuses mainly on weak joint planes under two-dimensional stress, with limited studies on rigid joint planes' response to dynamic disturbance under true 3D stress. Moreover, the discrete nature of naturally cemented joint planes complicates direct investigation. Therefore, this study proposes a specimen preparation method for cemented rigid joint planes considering diagenetic pressure, mineral composition, and particle size gradation. A high-strength, high-rigidity rock mass similar material with joint planes was developed, and true triaxial shear tests were conducted to reflect the excavation stress concentration, unloading, and disturbance coupling. The effects of different roughness levels on the shear characteristics and fracture mechanisms were analyzed. The results indicated that the hanging wall and footwall materials reached a strength of 120&#xa0;MPa and an elastic modulus of 32&#xa0;GPa, whereas the joint interlayer reached approximately 65&#xa0;MPa and approximately 14&#xa0;GPa, respectively, closely resembling natural rock materials. As the joint plane roughness increased, the shear strength increased, the rate of shear irreversible disturbance strain slowed, and the rate of normal irreversible disturbance strain decreased. The failure mode shifted from the overall shedding of the cementation layer to localized and large-area shear fragmentation. Approaching failure, the AE count spiked, the <i>b</i>-value dropped by over 75%, lg<i>N</i>/<i>b</i> surged by more than 500%, and the fractal dimension first decreased significantly, then rose sharply by over 300%.</p>

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Novel Similar Materials Development and Static-Dynamic Shear Cracking Mechanisms of Cemented Rigid Joint Rockmass Under Three-Dimensional Stress Paths

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Zhi Zheng,
  • Yihuai Zhang,
  • Yuanyuan Shen,
  • Xiaohua Huang,
  • Wuqiang Cai,
  • Dingping Xu,
  • Quan Jiang

摘要

In deep underground engineering, rock masses under true three-dimensional stress are vulnerable to stress waves from excavation and other dynamic activities, leading to instability and failure along weak joint planes. Current research focuses mainly on weak joint planes under two-dimensional stress, with limited studies on rigid joint planes' response to dynamic disturbance under true 3D stress. Moreover, the discrete nature of naturally cemented joint planes complicates direct investigation. Therefore, this study proposes a specimen preparation method for cemented rigid joint planes considering diagenetic pressure, mineral composition, and particle size gradation. A high-strength, high-rigidity rock mass similar material with joint planes was developed, and true triaxial shear tests were conducted to reflect the excavation stress concentration, unloading, and disturbance coupling. The effects of different roughness levels on the shear characteristics and fracture mechanisms were analyzed. The results indicated that the hanging wall and footwall materials reached a strength of 120 MPa and an elastic modulus of 32 GPa, whereas the joint interlayer reached approximately 65 MPa and approximately 14 GPa, respectively, closely resembling natural rock materials. As the joint plane roughness increased, the shear strength increased, the rate of shear irreversible disturbance strain slowed, and the rate of normal irreversible disturbance strain decreased. The failure mode shifted from the overall shedding of the cementation layer to localized and large-area shear fragmentation. Approaching failure, the AE count spiked, the b-value dropped by over 75%, lgN/b surged by more than 500%, and the fractal dimension first decreased significantly, then rose sharply by over 300%.