理论与试验研究

侧向约束下原状软碎岩体变形特性试验研究

  • 冯杰 ,
  • 钟志彬 ,
  • 吕蕾 ,
  • 魏星灿 ,
  • 陈旭
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  • 1.成都理工大学 地质灾害防治与地质环境保护国家重点实验室,成都 610059;
    2.成都建工路桥建设 有限公司,成都 610073;
    3.中国电建集团成都勘测设计研究院有限公司,成都 610072
冯杰(1999—),男,四川乐山人,硕士生,主要从事工程岩体灾变机理方向的研究。E-mail:j1596901510@163.com
钟志彬(1988—),男,福建长汀人,博士,副教授,主要从事工程岩体灾变机理及防控技术方面的教学和科研工作。E-mail:zzb2007@163.com

收稿日期: 2024-10-20

  网络出版日期: 2025-06-13

基金资助

国家自然科学基金(42293353,42293350,51808458);四川省自然科学基金(2022NSFSC0403)

Experimental Study on Deformation Characteristics of Insitu Soft Crushed Rock Mass under Lateral Constraints

  • Feng Jie ,
  • Zhong Zhibin ,
  • Lü Lei ,
  • Wei Xingcan ,
  • Chen Xu
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  • 1. State Key Laboratory of Geological Disaster Prevention and Geoenvironmental Protection, Chengdu University of Technology, Chengdu 610059, P.R. China;
    2. Chengdu Jiangong Road and Bridge Construction Co., Ltd., Chengdu 610073, P.R. China;
    3. PowerChina Chengdu Survey, Design and Research Institute Co., Ltd., Chengdu 610072, P.R. China

Received date: 2024-10-20

  Online published: 2025-06-13

摘要

掌握软弱破碎岩体的变形特性是合理进行地下工程设计和安全施工的关键。依托固增水电站引水隧洞工程,采集低扰动原状岩样开展被动三轴压缩试验,获得分级荷载作用下隧址区软碎岩体的变形曲线,利用经验流变模型和孙广忠提出的黏弹性流变模型分析原状软碎岩的时效变形特征。结果表明:(1)软碎岩体在被动三轴压缩下,加载阶段具有初期压密变形大、中期似弹性变形小、屈服后产生较大塑性变形的三阶段变形特征,稳压阶段表现为较小轴力作用下即出现加速变形的特征;(2)两种流变模型能够较好地描述软碎岩样的稳压变形过程,黏弹性流变模型参数随轴向加载压力变化规律,揭示了稳压过程中试样内部裂隙闭合-压密不同阶段时效性变形特征的差异。

本文引用格式

冯杰 , 钟志彬 , 吕蕾 , 魏星灿 , 陈旭 . 侧向约束下原状软碎岩体变形特性试验研究[J]. 地下空间与工程学报, 2025 , 21(3) : 950 -958 . DOI: 10.20174/j.JUSE.2025.03.23

Abstract

Understanding the deformation characteristics of soft and fractured rock masses is crucial for the rational design and safe construction of underground engineering projects. Based on the diversion tunnel project of the Guzhen Hydropower Station, where undisturbed rock samples were collected to conduct passive triaxial compression tests. Deformation curves of the soft fractured rock mass in the tunnel site area under graded loading were obtained. The study analyzed the time-dependent deformation characteristics using both empirical rheological models and the viscoelastic rheological model proposed by Sun Guangzhong. The results indicate that: (1) Under passive triaxial compression, the soft fractured rock mass exhibits three-stage deformation characteristics, including initial significant compaction deformation during the loading stage, relatively elastic deformation in the middle stage, and significant plastic deformation after yielding. The stable pressure stage shows accelerated deformation under relatively small axial stresses. (2) Both rheological models can effectively describe the stable pressure deformation process of the soft fractured rock samples. The parameters of the viscoelastic rheological model vary with axial loading pressure, revealing differences in time-dependent deformation characteristics during the closure-compaction stages of internal fissures within the sample.

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