Abstract Due to the factors such as external load and environment, a tunnel in service is often vulnerable to the de? fects such as structural deformation and segment cracking, and such defects are very likely to cause tunnel safety accidents. Therefore a damaged tunnel needs to be reinforced. With a review on the domestic and foreign research into tunnel lining reinforced by high-performance concrete, the action mechanism and mechanical properties of the combination of UHPC, ECC and steel plate-high-performance concrete that are used to reinforce tunnel lining are systematically analyzed herein. For the three types of high-performance concrete that are used to reinforce tunnel lining,the synergistic effect between the reinforcing layer and lining can be achieved through interfacial bonding. Then stress redistribution occurs inside the structure, so as to enhance the bearing capacity, toughness and durability of lining. When reinforced by UHPC, the bearing capacity of a segment can increase by 30.0%~103.0%. When the tunnel lining is reinforced by ECC, the cracking toughness increases by up to 181.0%. When reinforced by steel plate and high-performance concrete, the ultimate bending moment of a segment increases by 284.0%~467.0% as compared with an unreinforced plain concrete segment. Besides, this paper offers suggestions regarding further research into the highperformance concrete used to reinforce tunnel lining.
Abstract：
Due to the factors such as external load and environment, a tunnel in service is often vulnerable to the de? fects such as structural deformation and segment cracking, and such defects are very likely to cause tunnel safety accidents. Therefore a damaged tunnel needs to be reinforced. With a review on the domestic and foreign research into tunnel lining reinforced by high-performance concrete, the action mechanism and mechanical properties of the combination of UHPC, ECC and steel plate-high-performance concrete that are used to reinforce tunnel lining are systematically analyzed herein. For the three types of high-performance concrete that are used to reinforce tunnel lining,the synergistic effect between the reinforcing layer and lining can be achieved through interfacial bonding. Then stress redistribution occurs inside the structure, so as to enhance the bearing capacity, toughness and durability of lining. When reinforced by UHPC, the bearing capacity of a segment can increase by 30.0%~103.0%. When the tunnel lining is reinforced by ECC, the cracking toughness increases by up to 181.0%. When reinforced by steel plate and high-performance concrete, the ultimate bending moment of a segment increases by 284.0%~467.0% as compared with an unreinforced plain concrete segment. Besides, this paper offers suggestions regarding further research into the highperformance concrete used to reinforce tunnel lining.
CHEN Meng LIANG Zhonglong YU Hang SUN Junqi ZHANG Tong
.Overview on Mechanical Properties of a Tunnel Lining Reinforced by High-performance Concrete[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(3): 61-71
2024, Vol. 61 