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An experimental and theoretical investigation of time-dependent cracking and creep behavior of rocks under triaxial hydro-mechanical coupling
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2021-07-12 , DOI: 10.1016/j.tafmec.2021.103046
Jie Mei 1 , Lei Yang 1 , Xiangchao Sheng 1 , Xujin Ma 1 , Bin Sui 2 , Weimin Yang 1
Affiliation  

Subcritical crack propagation and rock creep deformation are the main factors affecting the long-term stability and strength characteristics of rocks under hydro-mechanical coupling. Triaxial creep tests were performed on rock-like mortar specimens containing a pre-existing 3-D crack to investigate the time-dependent mechanical behavior of the cracked rock. A modified theoretical model for the irreversible deformation of rocks based on subcritical crack propagation was used to analyze the creep mechanism of the specimens and the effects of water pressure. The specimens with creep damage mainly exhibited a tensile-shear failure mode, and the macrofracture presented more tensile characteristics with increasing water pressure. The water pressure promoted the prefabricated crack propagation, inhibited the formation of microcracks, increased the creep rate, and accelerated specimen failure, which had a negative effect on the long-term stability of the specimens. The modified model accurately predicted the variation in irreversible axial strain and time required for specimen failure, especially under higher water pressures. The creep deformation of the specimens was much larger than the instantaneous deformation at the same crack propagation length, indicating that subcritical crack propagation is the main factor leading to the failure of rocks.



中文翻译:

三轴水力耦合作用下岩石时变开裂蠕变行为的实验与理论研究

亚临界裂纹扩展和岩石蠕变变形是影响水力耦合作用下岩石长期稳定性和强度特性的主要因素。对含有预先存在的 3-D 裂纹的类岩石砂浆试样进行了三轴蠕变试验,以研究开裂岩石随时间变化的力学行为。基于亚临界裂纹扩展的岩石不可逆变形修正理论模型被用来分析试件的蠕变机制和水压的影响。蠕变损伤试件主要表现为拉剪破坏模式,宏观裂缝随着水压的增加表现出更多的拉伸特性。水压促进了预制裂纹扩展,抑制了微裂纹的形成,增加蠕变速率,加速试样破坏,这对试样的长期稳定性产生负面影响。修改后的模型准确地预测了不可逆轴向应变的变化和试样失效所需的时间,尤其是在较高的水压下。在相同裂纹扩展长度下,试样的蠕变变形远大于瞬时变形,表明亚临界裂纹扩展是导致岩石破坏的主要因素。

更新日期:2021-07-23
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