理论与试验研究

裂隙砂岩强度与能量特征的真三轴试验研究

  • 孙国文 ,
  • 黄滚 ,
  • 黄心宇 ,
  • 梁秦铭 ,
  • 陆驭
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  • 1.重庆工程职业技术学院 科技处,重庆 400000;
    2.重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆 400044;
    3.重庆大学 资源与安全学院,重庆 400044
孙国文(1976—),男,重庆人,硕士,副教授,主要从事矿山压裂、岩石力学的教学与科研工作。E-mail:657249979@qq.com
黄滚(1972—),男,重庆人,博士,教授,主要从事矿山压裂、岩石力学的教学与科研工作。E-mail:hg023@cqu.edu.cn

收稿日期: 2024-10-25

  网络出版日期: 2025-06-13

基金资助

重庆市教委科学技术研究项目(KJZD-K202203402);国家自然科学基金青年基金(52104231)

True Triaxial Experimental Study of the Strength and Energy Characteristics of Fractured Sandstone

  • Sun Guowen ,
  • Huang Gun ,
  • Huang Xinyu ,
  • Liang Qinming ,
  • Lu Yu
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  • 1. Technology Department, Chongqing Vocational Institute of Engineering, Chongqing 400000, P.R. China;
    2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P.R China;
    3. School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, P.R China

Received date: 2024-10-25

  Online published: 2025-06-13

摘要

裂隙岩体的强度显著影响地下工程建设的安全性和稳定性。为深入理解裂隙岩石的强度和能量演化特征,本文开展了真三轴应力条件下不同裂隙倾角砂岩的强度试验研究。结果表明:随着裂隙倾角(α)的变化,起裂应力在α为15°~45°的条件下变化幅度小,在α大于45°(60°、75°、90°)的条件下则表现为迅速增长;损伤应力与峰值应力总体上呈现先减后增的变化趋势。根据能量理论的计算结果可知:随着α的增加,试样在破坏时的总应变能、弹性应变能、耗散应变能均呈现先减后增的变化趋势,与试样的峰值强度有较好的对应关系。研究成果可为裂隙岩体工程的稳定性评估提供理论参考。

本文引用格式

孙国文 , 黄滚 , 黄心宇 , 梁秦铭 , 陆驭 . 裂隙砂岩强度与能量特征的真三轴试验研究[J]. 地下空间与工程学报, 2025 , 21(3) : 940 -949 . DOI: 10.20174/j.JUSE.2025.03.22

Abstract

The strength of fractured rock significantly affects the safety and stability of underground engineering construction projects. To gain a deeper understanding of the strength and energy evolution characteristics of fractured rock, this paper carries out an experimental study on the strength of sandstones with different inclination angles under true triaxial stress conditions. The experimental results show that: With the change of the fissure inclination angle (α), the initiation stress has a small change under the condition of α of 15°~45°, and shows a rapid increase under the condition of α greater than 45° (60°,75°,90°). The damage stress and peak stress in general show a trend of first decrease and then increase. According to the calculation results of the energy theory: With the increase of α, the total strain energy, elastic strain energy and dissipative strain energy of the specimen at the time of damage show a trend of decreasing and then increasing, which has a good correspondence with the peak strength of the specimen. The research results can provide theoretical reference for the stability assessment of fissured rock engineering.

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