多次动态扰动下红砂岩时效变形特性研究

    刘闽龙, 陈士海, 石伟民, 崔广强, 沈峰, 李海波

    刘闽龙, 陈士海, 石伟民, 崔广强, 沈峰, 李海波. 多次动态扰动下红砂岩时效变形特性研究[J]. 岩土工程学报, 2022, 44(10): 1917-1924. DOI: 10.11779/CJGE202210018
    引用本文: 刘闽龙, 陈士海, 石伟民, 崔广强, 沈峰, 李海波. 多次动态扰动下红砂岩时效变形特性研究[J]. 岩土工程学报, 2022, 44(10): 1917-1924. DOI: 10.11779/CJGE202210018
    LIU Min-long, CHEN Shi-hai, SHI Wei-min, CUI Guang-qiang, SHEN Feng, LI Hai-bo. Time-dependent deformation characteristics of red sandstone under multiple dynamic disturbances[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(10): 1917-1924. DOI: 10.11779/CJGE202210018
    Citation: LIU Min-long, CHEN Shi-hai, SHI Wei-min, CUI Guang-qiang, SHEN Feng, LI Hai-bo. Time-dependent deformation characteristics of red sandstone under multiple dynamic disturbances[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(10): 1917-1924. DOI: 10.11779/CJGE202210018

    多次动态扰动下红砂岩时效变形特性研究  English Version

    基金项目: 

    国家自然科学基金项目 51974136

    详细信息
      作者简介:

      刘闽龙(1996—),男,硕士研究生,主要从事岩石力学方面的研究工作。E-mail: 458652447@qq.com

      通讯作者:

      陈士海, E-mail: cshblast@163.com

    • 中图分类号: TU451

    Time-dependent deformation characteristics of red sandstone under multiple dynamic disturbances

    • 摘要: 为探究深部工程岩体受扰动作用下的时效变形特性,利用扰动伺服三轴加载系统对红砂岩开展了动态扰动三轴加载试验。试验结果表明:动态扰动作用下,岩石的轴向应变–时间曲线呈振荡式上升;扰动荷载的施加会引起岩石应变产生突增的现象,该应变的突增值随着扰动作用的次数呈指数式衰减;岩石破坏前累计扰动施加次数随着围压的增大而增大,随轴向应力加载水平的提升而减少;动态扰动在高静载应力水平下将引起岩石的快速破坏,在较低静载应力水平下岩石则表现为类似于疲劳破坏的时效破坏。
      Abstract: In order to explore the time-dependent deformation characteristics of deep engineering rock mass under disturbed action, the dynamic disturbance triaxial loading tests on red sandstone are carried out by using the disturbed servo triaxial loading system. The time-dependent deformation characteristics and failure modes of red sandstone damaged by disturbance under different confining pressures and axial pressures are analyzed. The test results show that under the action of dynamic disturbance, the axial strain-time curve of rock rises in an oscillating manner. The disturbance loads will cause the phenomenon of sudden increase of strain in rock, and the sudden increase of strain decreases exponentially with the number of disturbance. The application times of cumulative disturbance before rock failure increases with the increase of confining pressure, and decreases with the increase of axial stress loading level. The dynamic disturbance loads will lead to rapid failure of rock at higher static stress level, but it will lead to aging failure similar to the fatigue failure at lower static stress level.
    • 图  1   TFD-2000/D型动态扰动伺服三轴加载装置

      Figure  1.   TFD-2000 / D dynamic disturbance servo triaxial loading devices

      图  2   试验加载路径及加载模型示意图

      Figure  2.   Schematic diagram of loading path and model for tests

      图  3   岩石应变–时间曲线

      Figure  3.   Strain-time curves of rock

      图  4   扰动荷载–时间曲线

      Figure  4.   Relationship between disturbance load and time

      图  5   应力–应变曲线

      Figure  5.   Stress-strain curves

      图  6   多次动态扰动作用下岩石应变–时间全过程曲线

      Figure  6.   Complete stress-strain curves of rock under multiple dynamic disturbances

      图  7   单次扰动应变增量与扰动次数间关系

      Figure  7.   Relationship between strain increment of single disturbance and disturbance times

      图  8   岩石破坏模式

      Figure  8.   Failure modes of rock

      表  1   红砂岩的基本物理力学参数

      Table  1   Basic physical and mechanical parameters of red sandstone

      围压级别
      /MPa
      峰值抗压强度
      /MPa
      弹性模量
      /GPa
      0 62.01 6.60
      5 98.19 9.50
      10 120.82 11.07
      下载: 导出CSV

      表  2   试验加载方案

      Table  2   Schemes of test loading

      组别 围压
      /MPa
      轴向应力水平
      /%
      扰动频率/Hz 扰动幅值
      /MPa
      试验组一 0,5,10 85 3 10
      试验组二 5 70,80,90 3 10
      下载: 导出CSV

      表  3   不同围压下曲线拟合系数

      Table  3   Curve-fitting coefficients under different confining pressures

      围压/MPa A B C
      0 6.814 2.041 0.2151
      5 4.857 1.952 0.2813
      10 3.880 1.368 0.2644
      下载: 导出CSV

      表  4   不同轴压应力水平下曲线拟合系数

      Table  4   Curve-fitting coefficients under different axial compressive stress levels

      轴压应力水平/% A B C
      70 2.797 1.334 0.0590
      80 8.889 2.501 0.1007
      90 2.837 1.068 0.2248
      下载: 导出CSV
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    • 收稿日期:  2021-08-10
    • 网络出版日期:  2022-12-11
    • 刊出日期:  2022-09-30

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