Investigation into the Early Cracking Behavior of High-Geothermal Tunnel Lining Concrete Based on Thermal–Mechanical Coupling Model
As a typical extreme environment, a high-geothermal environment poses severe challenges to tunnel construction in western China. In this paper, a thermal–mechanical coupling model was formulated to evaluate the cracking behavior of lining under high-geothermal conditions, considering the early prope...
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MDPI AG
2025-01-01
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| Online Access: | https://www.mdpi.com/2075-5309/15/2/301 |
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| author | Si Xie Dan Zhao Peng Yi Qian Chen Wei Liu |
| author_facet | Si Xie Dan Zhao Peng Yi Qian Chen Wei Liu |
| author_sort | Si Xie |
| collection | DOAJ |
| description | As a typical extreme environment, a high-geothermal environment poses severe challenges to tunnel construction in western China. In this paper, a thermal–mechanical coupling model was formulated to evaluate the cracking behavior of lining under high-geothermal conditions, considering the early property evolution of concrete. This was further validated by field monitoring and analyzed by adjusting the relevant parameters. Results indicate that the higher cracking risk occurred on the external surface of the lining sidewall after 24 h of casting. With the increase in surrounding rock temperature, the duration of cracking risk in the lining was extended. When the surrounding rock temperature exceeded 68.7 °C, thermal insulation measures were required for the lining structure. Notably, superior thermal insulation was achieved by applying a sandwich structure of rigid polyurethane materials with a thickness of 20–60 mm. In terms of curing conditions, adopting formwork with a larger heat convection coefficient was conducive to reducing the cracking risk of the tunnel lining, with an appropriate removal time of 48 h. This work provides insights into the thermal–mechanical behavior of lining concrete, thereby mitigating its early cracking in a high-geothermal environment. |
| format | Article |
| id | doaj-art-eaa73e45a2db40dfa2a907d40494f827 |
| institution | Kabale University |
| issn | 2075-5309 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Buildings |
| spelling | doaj-art-eaa73e45a2db40dfa2a907d40494f8272025-01-24T13:26:32ZengMDPI AGBuildings2075-53092025-01-0115230110.3390/buildings15020301Investigation into the Early Cracking Behavior of High-Geothermal Tunnel Lining Concrete Based on Thermal–Mechanical Coupling ModelSi Xie0Dan Zhao1Peng Yi2Qian Chen3Wei Liu4State Key Laboratory of Intelligent Geotechnics and Tunnelling, China Railway First Survey and Design Institute Group Co., Ltd., Xi’an 710043, ChinaShenzhen Municipal Design and Research Institute Co., Ltd., Shenzhen 518029, ChinaState Key Laboratory of Intelligent Geotechnics and Tunnelling & National Engineering Research Center of Deep Shaft Construction, Shenzhen University, Shenzhen 518060, ChinaState Key Laboratory of Intelligent Geotechnics and Tunnelling & National Engineering Research Center of Deep Shaft Construction, Shenzhen University, Shenzhen 518060, ChinaState Key Laboratory of Intelligent Geotechnics and Tunnelling & National Engineering Research Center of Deep Shaft Construction, Shenzhen University, Shenzhen 518060, ChinaAs a typical extreme environment, a high-geothermal environment poses severe challenges to tunnel construction in western China. In this paper, a thermal–mechanical coupling model was formulated to evaluate the cracking behavior of lining under high-geothermal conditions, considering the early property evolution of concrete. This was further validated by field monitoring and analyzed by adjusting the relevant parameters. Results indicate that the higher cracking risk occurred on the external surface of the lining sidewall after 24 h of casting. With the increase in surrounding rock temperature, the duration of cracking risk in the lining was extended. When the surrounding rock temperature exceeded 68.7 °C, thermal insulation measures were required for the lining structure. Notably, superior thermal insulation was achieved by applying a sandwich structure of rigid polyurethane materials with a thickness of 20–60 mm. In terms of curing conditions, adopting formwork with a larger heat convection coefficient was conducive to reducing the cracking risk of the tunnel lining, with an appropriate removal time of 48 h. This work provides insights into the thermal–mechanical behavior of lining concrete, thereby mitigating its early cracking in a high-geothermal environment.https://www.mdpi.com/2075-5309/15/2/301high-geothermallining concretethermal–mechanical coupling modelsurrounding rock temperaturethermal insulation layercuring condition |
| spellingShingle | Si Xie Dan Zhao Peng Yi Qian Chen Wei Liu Investigation into the Early Cracking Behavior of High-Geothermal Tunnel Lining Concrete Based on Thermal–Mechanical Coupling Model Buildings high-geothermal lining concrete thermal–mechanical coupling model surrounding rock temperature thermal insulation layer curing condition |
| title | Investigation into the Early Cracking Behavior of High-Geothermal Tunnel Lining Concrete Based on Thermal–Mechanical Coupling Model |
| title_full | Investigation into the Early Cracking Behavior of High-Geothermal Tunnel Lining Concrete Based on Thermal–Mechanical Coupling Model |
| title_fullStr | Investigation into the Early Cracking Behavior of High-Geothermal Tunnel Lining Concrete Based on Thermal–Mechanical Coupling Model |
| title_full_unstemmed | Investigation into the Early Cracking Behavior of High-Geothermal Tunnel Lining Concrete Based on Thermal–Mechanical Coupling Model |
| title_short | Investigation into the Early Cracking Behavior of High-Geothermal Tunnel Lining Concrete Based on Thermal–Mechanical Coupling Model |
| title_sort | investigation into the early cracking behavior of high geothermal tunnel lining concrete based on thermal mechanical coupling model |
| topic | high-geothermal lining concrete thermal–mechanical coupling model surrounding rock temperature thermal insulation layer curing condition |
| url | https://www.mdpi.com/2075-5309/15/2/301 |
| work_keys_str_mv | AT sixie investigationintotheearlycrackingbehaviorofhighgeothermaltunnelliningconcretebasedonthermalmechanicalcouplingmodel AT danzhao investigationintotheearlycrackingbehaviorofhighgeothermaltunnelliningconcretebasedonthermalmechanicalcouplingmodel AT pengyi investigationintotheearlycrackingbehaviorofhighgeothermaltunnelliningconcretebasedonthermalmechanicalcouplingmodel AT qianchen investigationintotheearlycrackingbehaviorofhighgeothermaltunnelliningconcretebasedonthermalmechanicalcouplingmodel AT weiliu investigationintotheearlycrackingbehaviorofhighgeothermaltunnelliningconcretebasedonthermalmechanicalcouplingmodel |