岩土力学 ›› 2025, Vol. 46 ›› Issue (10): 3077-3092.doi: 10.16285/j.rsm.2024.1389CSTR: 32223.14.j.rsm.2024.1389

• 基础理论与实验研究 • 上一篇    下一篇

断续节理产状对砂岩破坏特征影响的真三轴试验研究

蒋剑青1, 2, 3，罗敏华1，胡诗红1，柳志灏1   

  1. 1．广西大学 土木建筑工程学院，广西 南宁，530004；2．广西大学 工程防灾与结构安全教育部重点实验室，广西 南宁，530004； 3．广西大学 广西岩溶区水安全与智慧调控工程研究中心，广西 南宁，530004)
  • 收稿日期:2024-11-08 接受日期:2025-02-05 出版日期:2025-10-11 发布日期:2025-10-13
  • 通讯作者: 胡诗红，男，1996年生，博士研究生，主要从事水工结构安全方面的研究。E-mail: 2210403005@st.gxu.edu.cn
  • 作者简介:蒋剑青，男，1988年生，博士，副教授，博士生导师，主要从事水工结构安全方面的研究。E-mail: jiangqing880201@163.com
  • 基金资助:
    国家自然科学基金（No. 52269023）；广西科技基地和人才专项（No. AD22080030）；广西研究生教育创新计划项目（No. YCBZ2023047）。

True triaxial test study on the influence of intermittent joint occurrence on sandstone failure characteristics

JIANG jian-qing1, 2, 3, LUO Min-hua1, HU Shi-hong1, LIU Zhi-hao1   

  1. 1. School of Civil and Architecture Engineering, Guangxi University, Nanning, Guangxi 530004, China; 2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China; 3. Guangxi Provincial Engineering Research Center of Water Security and Intelligent Control for Karst Region, Guangxi University, Nanning, Guangxi 530004, China
  • Received:2024-11-08 Accepted:2025-02-05 Online:2025-10-11 Published:2025-10-13
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52269023), the Guangxi Science and Technology Project (AD22080030) and the Innovation Project of Guangxi Graduate Education (YCBZ2023047).

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摘要： 为揭示深埋工程中断续节理岩体的破坏机制，开展了含不同节理产状（倾角和走向）断续节理砂岩的真三轴压缩试验，并利用声发射（acoustic emission，简称AE）系统实时监测试样破坏过程，系统分析了节理产状对砂岩破坏形态、强度、变形特性、声发射演化特征及特征应力的影响。研究结果表明：真三轴应力条件下，当断续节理走向与σ2平行时，节理倾角为0°、30°和45°的试样出现拉剪混合破坏，节理倾角为60°和90°的试样分别出现滑移剪切破坏和共轭剪切破坏；当断续节理走向与σ3平行时，含不同节理倾角试样的破坏模式均为外部板裂内部剪切破坏，说明节理走向对试样破坏模式的影响大于节理倾角。试样强度、起裂应力、损伤应力、弹性模量和峰值应变均随着节理倾角的增加而呈现先降低后增加的趋势。节理走向与σ2平行的试样强度、起裂应力、损伤应力和峰值应变低于节理走向与σ3平行的试样，而节理走向对试样弹性模量的影响不大。此外，AE平静期持续时间和AE高频信号比例随着节理倾角的增加而先降低后增加。当断续节理走向与σ2平行时，试样破坏过程的AE累计撞击数随节理倾角的增加而先降低后增加再降低；当断续节理走向与σ3平行时，试样破坏过程的AE累计撞击数随节理倾角的增加而先增加后降低。该研究结果为深埋工程的断续节理岩体破坏机制分析及工程地质灾害防治提供了科学依据。

关键词: 天然岩体, 断续节理, 节理产状, 真三轴试验, 破坏特征

Abstract: To reveal the failure mechanism of intermittent jointed rock in deep-buried engineering, true triaxial compression tests of intermittent jointed sandstone with different joint occurrences (dip and strike) were carried out, and acoustic emission (AE) system was used to monitor the failure process of specimens in real-time. The influences of joint occurrence on sandstone failure form, strength, deformation characteristics, AE evolution characteristics, and characteristic stresses were systematically analyzed. The results show that under the condition of true triaxial stress, when the intermittent joint strike is parallel to σ2, the specimens with joint dip angles of 0°, 30°, and 45° exhibit tensile-shear mixed failure, while the specimens with joint dip angles of 60° and 90° exhibit slipping-shear failure and conjugate shear failure, respectively. When the intermittent joint strike is parallel to σ3, the failure mode of the samples with different joint angles is “internal shear and external spalling”, indicating that the joint strike has a greater influence on the failure mode of the specimens than the joint dip angles. The strength, crack initiation stress, damage stress, elastic modulus, and peak strain of specimens all decrease first and then increase with the increase of joint dip angle. The strength, initiation stress, damage stress, and peak strain of the specimens with joint strike parallel to σ2 are lower than those with joint strike parallel to σ3, and the influence of joint strike on the elastic modulus of specimens is minimal. In addition, the duration of the AE quiet period and the proportion of AE high-frequency signal during this period decrease first and then increase with the increase of joint dip angle. When the intermittent joint strike is parallel to σ2, the cumulative number of AE hits during the failure process of the specimen decreases first, then increases, and then decreases with the increase of the joint dip angle. When the intermittent joint strike is parallel to σ3, the cumulative number of AE hits during the failure process of the specimen increases first and then decreases with the increase of the joint dip angle. The research results provide a scientific basis for the failure mechanism analysis of intermittent jointed rock mass and the prevention of engineering geological disasters in deep-buried engineering.

Key words: natural rock mass, intermittent joints, joint occurrence, true triaxial test, failure characteristics

中图分类号: TU 457
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