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Volume 31 Issue 11
Nov.  2024
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文章导航 >  矿物冶金与材料学报（英文）  > 2024  >  31(11): 2417-2434
Xinxin Nie, Qian Yin, Manchao He, Qi Wang, Hongwen Jing, Bowen Zheng, Bo Meng, Tianci Deng, Zheng Jiang, and Jiangyu Wu, Shear mechanical properties and fracturing responses of layered rough jointed rock-like materials, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2417-2434. https://doi.org/10.1007/s12613-024-2893-9
Cite this article as:
Xinxin Nie, Qian Yin, Manchao He, Qi Wang, Hongwen Jing, Bowen Zheng, Bo Meng, Tianci Deng, Zheng Jiang, and Jiangyu Wu, Shear mechanical properties and fracturing responses of layered rough jointed rock-like materials, Int. J. Miner. Metall. Mater., 31(2024), No. 11, pp. 2417-2434. https://doi.org/10.1007/s12613-024-2893-9
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研究论文

层状粗糙节理类岩材料剪切力学特性及断裂响应

  • 1)

    中国矿业大学深部岩土力学与地下工程国家重点实验室, 徐州 221116, 中国

  • 2)

    中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室, 北京 100083, 中国

  • 3)

    中国科学院地质与地球物理研究所页岩气与地质工程重点实验室, 北京 100029, 中国

  • 4)

    Department of Materials, University of Oxford, Oxford OX1 3PH, UK



  • 通讯作者:

    尹乾    E-mail: Jeryin@foxmail.com

    吴疆宇    E-mail: wujiangyu@cumt.edu.cn

文章亮点

  • (1) 揭示了层状粗糙节理岩体的剪切力学特性
  • (2) 监测了剪切过程中裂纹活动和应变场演化
  • (3) 分析了层间诱导效应和剪破面粗糙度差异
  • 层状粗糙节理岩体表现出显著的各向异性，在开挖扰动影响下，易相对错动从而发生剪切滑移破坏，给巷道围岩变形和稳定性控制带来巨大挑战。本文旨在研究层状粗糙节理岩体的直剪力学特性和渐进失稳破坏机理。首先，采用类岩石材料浇筑了具有不同节理面粗糙度（JRC = 2–20）和节理面倾角(α = 15°–75°)的立方体试样，并开展了不同初始法向应力下的直剪试验（σn = 1–4 MPa）。试验结果表明，不同工况下层状岩体的力学特性、声发射（AE）响应、最大主应变场演化和最终破坏模式存在显著差异。峰值应力随α的增加而增大，在α = 60°或75°时达到最大值。随σn的增加，峰值应力呈上升趋势，线性最小二乘拟合的相关系数R2在0.918至0.995之间。当JRC从2–4增加到18–20，α = 15°时内聚力增大86.32%，而α = 75°时减小27.93%。α的不同引起剪切破裂面粗糙特征差异显著，使得峰后AE响应呈现各向异性特征。α = 15°时，剪切破裂面沿软弱夹层形成，而当α = 60°时，剪切破裂面穿透层状基质。随σn的增加，α = 15°时相邻软弱夹层诱导拉裂纹扩展方向改变，裂纹呈现阶梯状分布特征。
    • Research Article

    Shear mechanical properties and fracturing responses of layered rough jointed rock-like materials

    + Author Affiliations
      Abstract
    • This study aims to investigate mechanical properties and failure mechanisms of layered rock with rough joint surfaces under direct shear loading. Cubic layered samples with dimensions of 100 mm × 100 mm × 100 mm were casted using rock-like materials, with anisotropic angle (α) and joint roughness coefficient (JRC) ranging from 15° to 75° and 2–20, respectively. The direct shear tests were conducted under the application of initial normal stress (σn) ranging from 1–4 MPa. The test results indicate significant differences in mechanical properties, acoustic emission (AE) responses, maximum principal strain fields, and ultimate failure modes of layered samples under different test conditions. The peak stress increases with the increasing α and achieves a maximum value at α = 60° or 75°. As σn increases, the peak stress shows an increasing trend, with correlation coefficients R² ranging from 0.918 to 0.995 for the linear least squares fitting. As JRC increases from 2–4 to 18–20, the cohesion increases by 86.32% when α = 15°, while the cohesion decreases by 27.93% when α = 75°. The differences in roughness characteristics of shear failure surface induced by α result in anisotropic post-peak AE responses, which is characterized by active AE signals when α is small and quiet AE signals for a large α. For a given JRC = 6–8 and σn = 1 MPa, as α increases, the accumulative AE counts increase by 224.31% (α increased from 15° to 60°), and then decrease by 14.68% (α increased from 60° to 75°). The shear failure surface is formed along the weak interlayer when α = 15° and penetrates the layered matrix when α = 60°. When α = 15°, as σn increases, the adjacent weak interlayer induces a change in the direction of tensile cracks propagation, resulting in a stepped pattern of cracks distribution. The increase in JRC intensifies roughness characteristics of shear failure surface for a small α, however, it is not pronounced for a large α. The findings will contribute to a better understanding of the mechanical responses and failure mechanisms of the layered rocks subjected to shear loads.
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