Effect of high temperature on the mixed mode I-II fracture characteristics of hot-dry rock

•The effect of high temperature on fracture characteristics of sandstone and granite.•The experiments of pure mode I, pure mode II and mixed mode I-II fracture.•The evolution law of fracture parameters with temperature was studied.•Analysis of high temperature fracture mechanism of sandstone and gra...

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Published inEngineering fracture mechanics Vol. 303; p. 110141
Main Authors Zhou, Mao, He, Fengfei, Zhang, Wenyu, Xu, Yaozhong, Wang, Yunru, Dong, Shiming
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 05.06.2024
Subjects
CCBD
Fracture toughness
High temperature
Hot-dry rock
Mixed mode fracture
High temperature
CCBD
Mixed mode fracture
Hot-dry rock
Fracture toughness
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Abstract •The effect of high temperature on fracture characteristics of sandstone and granite.•The experiments of pure mode I, pure mode II and mixed mode I-II fracture.•The evolution law of fracture parameters with temperature was studied.•Analysis of high temperature fracture mechanism of sandstone and granite. To investigate the variation law of rock fracture characteristics with temperature in hot-dry reservoirs, the pure mode I, pure mode II and mixed mode I-II loading experiments were carried out on sandstone and granite at room temperature and after high-temperature (100 °C, 300 °C, 500 °C and 700 °C) treatment by using the central cracked Brazilian disk (CCBD) specimen. The changes of parameters such as failure load, fracture toughness and fracture envelope with temperature were discussed, and the changes of rock mineral composition and fracture surface morphology were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM), respectively. The results showed that the influence of temperature on the fracture characteristics of sandstone and granite presents different evolution laws.With the increase of temperature, the failure modes of sandstone and granite all change from brittle failure to ductile failure, but the critical temperature of the transition is different. Granite shows obvious ductile failure characteristics at 500 °C, while sandstone shows slight ductile failure characteristics at 500 °C.The failure load and fracture toughness of sandstone increase first and then decrease with the increase of temperature, which indicates that within a certain range, the temperature has a toughening effect on sandstone, and can improve its failure resistance. However, the failure load and fracture toughness of granite always decrease with the increase of temperature, which indicates that the temperature only has a deteriorating effect on granite. In the range of 100 °C to 500 °C, the temperature enhances (sandstone) or weakens (granite) the mode I fracture toughness of rocks more than it enhances or weakens the mode II fracture toughness. However, when the temperature is 700 °C, the temperature weakens the mode II fracture toughness more than the mode I fracture toughness. The area enclosed by the fracture envelope of sandstone first increases and then decreases with the increase of temperature, while the area enclosed by the fracture envelope of granite decreases with the increase of temperature. As the temperature increases, the tortuosity of the crack paths in sandstone and granite increases, the cross-section morphology becomes rougher, and the internal fissures and fragmentation increase.
AbstractList •The effect of high temperature on fracture characteristics of sandstone and granite.•The experiments of pure mode I, pure mode II and mixed mode I-II fracture.•The evolution law of fracture parameters with temperature was studied.•Analysis of high temperature fracture mechanism of sandstone and granite. To investigate the variation law of rock fracture characteristics with temperature in hot-dry reservoirs, the pure mode I, pure mode II and mixed mode I-II loading experiments were carried out on sandstone and granite at room temperature and after high-temperature (100 °C, 300 °C, 500 °C and 700 °C) treatment by using the central cracked Brazilian disk (CCBD) specimen. The changes of parameters such as failure load, fracture toughness and fracture envelope with temperature were discussed, and the changes of rock mineral composition and fracture surface morphology were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM), respectively. The results showed that the influence of temperature on the fracture characteristics of sandstone and granite presents different evolution laws.With the increase of temperature, the failure modes of sandstone and granite all change from brittle failure to ductile failure, but the critical temperature of the transition is different. Granite shows obvious ductile failure characteristics at 500 °C, while sandstone shows slight ductile failure characteristics at 500 °C.The failure load and fracture toughness of sandstone increase first and then decrease with the increase of temperature, which indicates that within a certain range, the temperature has a toughening effect on sandstone, and can improve its failure resistance. However, the failure load and fracture toughness of granite always decrease with the increase of temperature, which indicates that the temperature only has a deteriorating effect on granite. In the range of 100 °C to 500 °C, the temperature enhances (sandstone) or weakens (granite) the mode I fracture toughness of rocks more than it enhances or weakens the mode II fracture toughness. However, when the temperature is 700 °C, the temperature weakens the mode II fracture toughness more than the mode I fracture toughness. The area enclosed by the fracture envelope of sandstone first increases and then decreases with the increase of temperature, while the area enclosed by the fracture envelope of granite decreases with the increase of temperature. As the temperature increases, the tortuosity of the crack paths in sandstone and granite increases, the cross-section morphology becomes rougher, and the internal fissures and fragmentation increase.
ArticleNumber 110141
Author He, Fengfei
Wang, Yunru
Zhang, Wenyu
Zhou, Mao
Xu, Yaozhong
Dong, Shiming
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Keywords High temperature
CCBD
Mixed mode fracture
Hot-dry rock
Fracture toughness
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SubjectTerms CCBD
Fracture toughness
High temperature
Hot-dry rock
Mixed mode fracture
Title Effect of high temperature on the mixed mode I-II fracture characteristics of hot-dry rock
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