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Durability prediction of brittle rocks based on type-I crack extension theory
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2021-07-07 , DOI: 10.1016/j.tafmec.2021.103044
Mengze Yang 1 , Houxu Huang 2, 3 , Yu Yang 1
Affiliation  

When subjected to long-term static loading, with the accumulation of damage and fracture, brittle rock would fails when the static loading is lower than the compressive strength of the rock, and the increasing of the static loading can generally shorten the time required for the brittle rock failure. To explore the relationship between the durability of the brittle rock and the applied static loading, in this paper, the propagation modes of the microcracks in brittle rock under the static loading in the subcritical crack growth stage are uniformly attributed to the tensile mode, and the total time required for microcrack propagation in the subcritical crack growth stage is chosen as the criterion for judging the durability index of brittle rock. Based on the Maxwell model, the local effective tensile stress that drives crack propagation is derived. The phenomenon of brittle rock exhibiting tensile failure under the compressive stress is preliminarily explained, and the corresponding requirements for this phenomenon to occur are also presented. A new expression of rock durability prediction with a clear physical meaning is established. The key parameter, i.e., the durability index “n” in the newly derived expression is obtained through fitting, and the relationship between the durability index and the rock type is preliminarily analysed. This study may provide an approach for preliminarily estimating the durability of brittle rock.



中文翻译:

基于Ⅰ型裂纹扩展理论的脆性岩石耐久性预测

当承受长期静载荷时,随着损伤和断裂的积累,当静载荷低于岩石的抗压强度时,脆性岩石就会发生破坏,静载荷的增加一般可以缩短断裂所需的时间。脆性岩石破坏。为探讨脆性岩石耐久性与外加静载荷之间的关系,本文将亚临界裂纹扩展阶段静载荷作用下脆性岩石微裂纹的扩展模式统一归于拉伸模式,选择亚临界裂纹扩展阶段微裂纹扩展所需的总时间作为判断脆性岩石耐久性指标的标准。基于麦克斯韦模型,推导出驱动裂纹扩展的局部有效拉应力。初步解释了脆性岩石在压应力作用下发生拉伸破坏的现象,并提出了发生这种现象的相应要求。建立了具有明确物理意义的岩石耐久性预测新表达式。关键参数,即耐久性指数“n”通过拟合得到新导出的表达式,初步分析了耐久性指标与岩石类型的关系。该研究可为初步估算脆性岩石的耐久性提供一种方法。

更新日期:2021-07-18
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