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<p>To reveal the shear mechanical behavior of multi-jointed rock masses in deep underground engineering under constant normal stiffness (CNS) conditions, this study conducted comparative direct shear tests on rock-like material specimens containing single and double joints, focusing on the influence of the joint roughness coefficient (JRC) on the evolution characteristics of shear stress, normal stress, and normal displacement. The results show that when JRC is 2–16, the mechanical properties of single-jointed specimens are higher than those of double-jointed specimens, reflecting the increased structural damage caused by the increased number of joints. However, when JRC is 18–20, double-jointed specimens exhibit higher shear stress, normal displacement, and normal stress, increasing by 19.9%, 51.2%, and 26.7% respectively compared to single-jointed specimens, reflecting a significant superimposed reinforcement effect between double joints under high joint roughness conditions. Furthermore, the mean normal stress, mean shear stress, and mean normal displacement of both single-jointed and double-jointed specimens exhibit a distinct three-stage characteristic with respect to JRC. Failure mode analysis revealed that single-jointed specimens primarily exhibited tensile failure at the block edges, while double-jointed specimens were prone to developing multiple vertical cracks in the inter-joint layer region. The results demonstrate the influence of joint roughness coefficient variations on the shear behavior of deep rock masses, providing experimental evidence for stability analysis of deep jointed rock masses.</p>

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Experimental Studies on the Shear Behaviours of Rock Materials Containing Double Joints Under Constant Normal Stiffness Boundary Condition

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Guansheng Han,
  • Yuqian Wang,
  • Xiaoqin Long,
  • Xuepeng Zhang,
  • Qiongqiong Tang

摘要

To reveal the shear mechanical behavior of multi-jointed rock masses in deep underground engineering under constant normal stiffness (CNS) conditions, this study conducted comparative direct shear tests on rock-like material specimens containing single and double joints, focusing on the influence of the joint roughness coefficient (JRC) on the evolution characteristics of shear stress, normal stress, and normal displacement. The results show that when JRC is 2–16, the mechanical properties of single-jointed specimens are higher than those of double-jointed specimens, reflecting the increased structural damage caused by the increased number of joints. However, when JRC is 18–20, double-jointed specimens exhibit higher shear stress, normal displacement, and normal stress, increasing by 19.9%, 51.2%, and 26.7% respectively compared to single-jointed specimens, reflecting a significant superimposed reinforcement effect between double joints under high joint roughness conditions. Furthermore, the mean normal stress, mean shear stress, and mean normal displacement of both single-jointed and double-jointed specimens exhibit a distinct three-stage characteristic with respect to JRC. Failure mode analysis revealed that single-jointed specimens primarily exhibited tensile failure at the block edges, while double-jointed specimens were prone to developing multiple vertical cracks in the inter-joint layer region. The results demonstrate the influence of joint roughness coefficient variations on the shear behavior of deep rock masses, providing experimental evidence for stability analysis of deep jointed rock masses.