Thermal treatment effects on rock fracture behaviour under three loading modes: A comparative analysis of granite and mudstone

脆性 断裂(地质) 地温梯度 地质学 岩土工程 材料科学 压力(语言学) 结壳 热的 复合材料 地球化学 废物管理 气象学 语言学 哲学 物理 地球物理学 工程类
作者
Abdel Kareem Alzo’ubi,Mahmoud Alneasan,Farid Ibrahim,Nader M. Okasha,Masoomeh Mirrashid
出处
期刊:Engineering Failure Analysis [Elsevier]
卷期号:159: 108092-108092 被引量:8
标识
DOI:10.1016/j.engfailanal.2024.108092
摘要

Temperature and thermal damage have a major impact on the behaviour of fractures in the earth's crust. For deep earth engineering such as underground coal gasification, geothermal energy extraction, and nuclear waste repositories, developing fracture criteria governing the propagation of fractures under thermal effect is crucial. As a result, the ability of stress, energy, and strain-based fracture criteria to predict rock fracture behavior both before and after thermal treatment is assessed in this paper considering two rock types; granite, and mudstone, which are very different from one another in terms of their mineralogical composition and mechanical properties. The overall findings showed that the energy-based criterion was more effective in predicting fracture parameters both before and after thermal treatment than the stress and strain-based criteria. Specifically, after thermal treatment at 500 oC for the granite, and at any temperature for the mudstone, the strain-based criterion was no longer valid. It was found that the temperature and loading mode have a significant impact on the granite's transition from brittle to ductile, where this transition can occur at an approximated temperature of 460 oC. Meanwhile, an increase in brittleness with rising temperature was noted in mudstone. Moreover, the Fracture Process Zone (FPZ) size was predicted by the energy-based criterion to be greater than that predicted by stress and strain-based criteria. It was found that the FPZ size is proportional to the brittleness degree of the two rock types, which is considerably impacted by thermal treatment. In addition, this study discusses several critical areas in rock fracture mechanics in the presence of thermal effects including fracture envelopes under mixed mode loading I/II, fracture stress, and initial crack extension angle. All of these are of high importance in assessing the safety and stability of rock structures in the presence of thermal effects.
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