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- W3208764525 endingPage "022024" @default.
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- W3208764525 abstract "In deep underground engineering, thermal spallation occurs when the brittle rock is suffering from high temperature. This phenomenon severely jeopardizes safety of worker and weakens the underground structure. Based on the rock thermal-mechanical-damage coupling model and theory, a novel model is proposed to explore the rock thermal spallation mechanism, including influential factors and damage evolution. The model mainly focuses on how the rock heterogeneity and micropore distribution influence thermal spallation under rapid heating. We analyse the internal temperature field, stress field, and damage field in the varying cases. This simulation results show that heterogeneity plays a pivot role in determining thermal spallation and damage in rocks. The greater the heterogeneity (more materials with larger thermal conductivity or elastic modulus), the more likely thermal spallation occurs. Moreover, the damage behaviour is also strongly influenced by micropore distribution inside the rock. The initial micropore distribution shapes preliminary damage in the rock. With the micropores increasing, the thermal spallation damage area is mostly concentrated around the micropores, as a result of the thermal stress and the existing damage together. In addition, this study indicates that the thermal damage in the rock is mainly caused by tensile stress induced by thermal expansion. The numerical results capture main features of the thermal spallation process in brittle rock, showing good agreement with the experimental observations." @default.
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- W3208764525 date "2021-10-01" @default.
- W3208764525 modified "2023-09-23" @default.
- W3208764525 title "Thermal-mechanical-damage coupling model for thermal spallation in rock" @default.
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- W3208764525 doi "https://doi.org/10.1088/1755-1315/861/2/022024" @default.
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