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<p>The attainment of the pure shear state in rock presents a significant challenge for conventional laboratory testing methods. To achieve the pure shear state conveniently, a Double-Notch Shear method is developed in this study. Marble samples are tested using an MTS 815 rock mechanics test system and a PCI-2 acquisition system, and the feasibility was validated through the mechanical and acoustic emission (AE) results. To acquire the appropriate geometry of the sample, a double-notch mechanical method for numerical simulation is established. The main factors affecting the distribution of stress are identified; an investigation into the impact of notch width, notch depth, hollow cylinder thickness, circular table radius, and notch chamfering has been conducted using the ABAQUS numerical simulation method. Moreover, the optimal parameter thresholds have been obtained based on the refined stress analysis. The results show that the preferred depth falls within the range of 14–16&#xa0;mm with an optimal width of 3–6&#xa0;mm for the upper notch, while for the lower notch, depths of 14–16&#xa0;mm and widths of 3–4&#xa0;mm are considered optimal. The hollow cylinder thickness is considered suitable within the 40–49&#xa0;mm range and the circular table radius is within the 35–44&#xa0;mm range. In addition, implementing chamfering measures at the notched edge has been demonstrated to mitigate stress concentration phenomena effectively. The determined sample parameters serve as valuable references for laboratory testing protocols.</p>

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Assessing Feasibility and Optimizing Parameters of the Double-Notch Shear Model via Experimental and Numerical Studies

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Dehang Liu,
  • Jianfeng Liu,
  • Jingjing Dai,
  • Jianxiong Yang,
  • Huaizhong Liu,
  • Bole Sun,
  • Song Zhang,
  • Linrui Li

摘要

The attainment of the pure shear state in rock presents a significant challenge for conventional laboratory testing methods. To achieve the pure shear state conveniently, a Double-Notch Shear method is developed in this study. Marble samples are tested using an MTS 815 rock mechanics test system and a PCI-2 acquisition system, and the feasibility was validated through the mechanical and acoustic emission (AE) results. To acquire the appropriate geometry of the sample, a double-notch mechanical method for numerical simulation is established. The main factors affecting the distribution of stress are identified; an investigation into the impact of notch width, notch depth, hollow cylinder thickness, circular table radius, and notch chamfering has been conducted using the ABAQUS numerical simulation method. Moreover, the optimal parameter thresholds have been obtained based on the refined stress analysis. The results show that the preferred depth falls within the range of 14–16 mm with an optimal width of 3–6 mm for the upper notch, while for the lower notch, depths of 14–16 mm and widths of 3–4 mm are considered optimal. The hollow cylinder thickness is considered suitable within the 40–49 mm range and the circular table radius is within the 35–44 mm range. In addition, implementing chamfering measures at the notched edge has been demonstrated to mitigate stress concentration phenomena effectively. The determined sample parameters serve as valuable references for laboratory testing protocols.