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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

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.

     

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