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Bonding Fracture and Deformation Behaviors of Sandstone–Concrete Interface Subjected to Different Temperatures under Three-Point Bending
https://orcid.org/0000-0001-8183-1989
Thermal operations threaten the safety of geological engineering, especially the rock–concrete interface, as the link of in situ stress transmission is crucial to structural stability. In this study, three-point bending experiments were conducted on sandstone–concrete binary specimens to investigate the thermal effect on fracture behaviors of the rock–concrete bonding interface. The deformation evolution characteristics were analyzed by digital image correlation (DIC). The results demonstrated that the temperature has a remarkable degradation for the bonding capacity of sandstone–concrete interfaces, which can be classified into the rapid-damage stage and steady-damage stage with a critical temperature of 300°C. The phased degradation is closely related to the decline in interfacial adhesion and the thermal damage to concrete, instead of sandstone. By determining the strain inflection point of different positions on the crack path, a new idea is proposed to reveal the crack propagation process. During the loading process, the crack propagates slowly to a certain length and then coalescences violently when subjected to a small load increment. In addition, the crack initiation load is weakened by the elevated temperature or lower interface roughness.
Thermal hazards (e.g., tunnel fire, coal spontaneous combustion, and radioactive heat in nuclear waste repositories) would weaken the bearing capacity of surrounding rock-lining structures. To ensure the durability of geoengineering and evaluate remediation value, it is essential to determine the mechanical and deformation properties of rock–concrete binary specimens subjected to a high temperature. The study suggests the temperature has a remarkable degradation for the bonding capacity of sandstone–concrete interfaces, which can be classified into the rapid-damage stage and steady-damage stage with a critical temperature of 300°C. The phased degradation is closely related to the decline in interfacial adhesion and the thermal damage to concrete, instead of sandstone. Therefore, the thermal damage not exceeding 300°C would retain the bearing capacity of sandstone–concrete interfaces; otherwise, the concrete lining must be removed and poured again. Meanwhile, roughening the rock surface could improve the interfacial adhesion but the effect is limited.
Bonding Fracture and Deformation Behaviors of Sandstone–Concrete Interface Subjected to Different Temperatures under Three-Point Bending
https://orcid.org/0000-0001-8183-1989
Thermal operations threaten the safety of geological engineering, especially the rock–concrete interface, as the link of in situ stress transmission is crucial to structural stability. In this study, three-point bending experiments were conducted on sandstone–concrete binary specimens to investigate the thermal effect on fracture behaviors of the rock–concrete bonding interface. The deformation evolution characteristics were analyzed by digital image correlation (DIC). The results demonstrated that the temperature has a remarkable degradation for the bonding capacity of sandstone–concrete interfaces, which can be classified into the rapid-damage stage and steady-damage stage with a critical temperature of 300°C. The phased degradation is closely related to the decline in interfacial adhesion and the thermal damage to concrete, instead of sandstone. By determining the strain inflection point of different positions on the crack path, a new idea is proposed to reveal the crack propagation process. During the loading process, the crack propagates slowly to a certain length and then coalescences violently when subjected to a small load increment. In addition, the crack initiation load is weakened by the elevated temperature or lower interface roughness.
Thermal hazards (e.g., tunnel fire, coal spontaneous combustion, and radioactive heat in nuclear waste repositories) would weaken the bearing capacity of surrounding rock-lining structures. To ensure the durability of geoengineering and evaluate remediation value, it is essential to determine the mechanical and deformation properties of rock–concrete binary specimens subjected to a high temperature. The study suggests the temperature has a remarkable degradation for the bonding capacity of sandstone–concrete interfaces, which can be classified into the rapid-damage stage and steady-damage stage with a critical temperature of 300°C. The phased degradation is closely related to the decline in interfacial adhesion and the thermal damage to concrete, instead of sandstone. Therefore, the thermal damage not exceeding 300°C would retain the bearing capacity of sandstone–concrete interfaces; otherwise, the concrete lining must be removed and poured again. Meanwhile, roughening the rock surface could improve the interfacial adhesion but the effect is limited.
Bonding Fracture and Deformation Behaviors of Sandstone–Concrete Interface Subjected to Different Temperatures under Three-Point Bending
https://orcid.org/0000-0001-8183-1989
Thermal operations threaten the safety of geological engineering, especially the rock–concrete interface, as the link of in situ stress transmission is crucial to structural stability. In this study, three-point bending experiments were conducted on sandstone–concrete binary specimens to investigate the thermal effect on fracture behaviors of the rock–concrete bonding interface. The deformation evolution characteristics were analyzed by digital image correlation (DIC). The results demonstrated that the temperature has a remarkable degradation for the bonding capacity of sandstone–concrete interfaces, which can be classified into the rapid-damage stage and steady-damage stage with a critical temperature of 300°C. The phased degradation is closely related to the decline in interfacial adhesion and the thermal damage to concrete, instead of sandstone. By determining the strain inflection point of different positions on the crack path, a new idea is proposed to reveal the crack propagation process. During the loading process, the crack propagates slowly to a certain length and then coalescences violently when subjected to a small load increment. In addition, the crack initiation load is weakened by the elevated temperature or lower interface roughness.
Thermal hazards (e.g., tunnel fire, coal spontaneous combustion, and radioactive heat in nuclear waste repositories) would weaken the bearing capacity of surrounding rock-lining structures. To ensure the durability of geoengineering and evaluate remediation value, it is essential to determine the mechanical and deformation properties of rock–concrete binary specimens subjected to a high temperature. The study suggests the temperature has a remarkable degradation for the bonding capacity of sandstone–concrete interfaces, which can be classified into the rapid-damage stage and steady-damage stage with a critical temperature of 300°C. The phased degradation is closely related to the decline in interfacial adhesion and the thermal damage to concrete, instead of sandstone. Therefore, the thermal damage not exceeding 300°C would retain the bearing capacity of sandstone–concrete interfaces; otherwise, the concrete lining must be removed and poured again. Meanwhile, roughening the rock surface could improve the interfacial adhesion but the effect is limited.
Bonding Fracture and Deformation Behaviors of Sandstone–Concrete Interface Subjected to Different Temperatures under Three-Point Bending
Int. J. Geomech.
Nie, Yinjiang (author) / Su, Haijian (author) / Yu, Liyuan (author) / Feng, Yujie (author) / Wang, Wenbo (author)
2023-04-01
Article (Journal)
Electronic Resource
English
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