Abstract In response to the issue where conventional arching reinforcement structure for tunnel cracked lining easi?
ly invade the construction clearance, a local arching reinforcement technology is proposed. A local arching structure is set up in the tunnel′s roof area, with curved segments at both ends of the arching structure connected to straight segments. The curvature difference between the straight segments and the secondary lining allows the reinforcement structure′s ends to be embedded into the secondary lining at any location, effectively avoiding the clearance invasion area. The lattice girder is embedded within the local arching structure, serving both as a permanent component to increase the structure′s load-bearing capacity and as a support structure during the removal of the secondary lining. A construction method based on "segmented construction, reasonable planning, partial removal, and support while removal" is proposed to ensure structural safety during secondary lining removal. The feasibility of the technology is demonstrated through its application in reinforcing a tunnel lining, and suggestions for expanding its application and optimizing its design are provided. This technology is suitable for arcuate section tunnels and can effectively improve the applicability of arching reinforcement methods in tunnel cracked lining treatment.
Abstract：
In response to the issue where conventional arching reinforcement structure for tunnel cracked lining easi?
ly invade the construction clearance, a local arching reinforcement technology is proposed. A local arching structure is set up in the tunnel′s roof area, with curved segments at both ends of the arching structure connected to straight segments. The curvature difference between the straight segments and the secondary lining allows the reinforcement structure′s ends to be embedded into the secondary lining at any location, effectively avoiding the clearance invasion area. The lattice girder is embedded within the local arching structure, serving both as a permanent component to increase the structure′s load-bearing capacity and as a support structure during the removal of the secondary lining. A construction method based on "segmented construction, reasonable planning, partial removal, and support while removal" is proposed to ensure structural safety during secondary lining removal. The feasibility of the technology is demonstrated through its application in reinforcing a tunnel lining, and suggestions for expanding its application and optimizing its design are provided. This technology is suitable for arcuate section tunnels and can effectively improve the applicability of arching reinforcement methods in tunnel cracked lining treatment.
SONG Jing WAN Li ZHANG Chang'an WU Tao
.Research and Application of the Local Arching Reinforcement Technology for
Cracked Lining in Operational Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(1): 267-274
2025, Vol. 62 