北京交通大学学报2024，Vol.48Issue(1)：54-65,12.DOI:10.11860/j.issn.1673-0291.20230061
公路隧道二衬钢筋装配化螺栓的接头设计
Design of assembled bolted joints for secondary lining reinforcement in highway tunnel
摘要
Abstract
Addressing the inefficiencies of on-site welding and binding of secondary lining steel bars inhighway tunnels, along with the challenges in quality control, this study derives a formula for calculat-ing the ultimate bearing capacity of reinforced concrete lining sections based on the linear concrete soft-ening constitutive model and the stress-strain relationship of steel bars. By integrating the ultimate bearing capacity of bolt connection surfaces and taking stress distribution coefficients as control fac-tors, the design method for bolts at connection surfaces is established. This method identifies charac-teristic sections under axial compression, large and small eccentricities, and pure bending states, thereby controlling the ultimate bearing capacity of reinforced concrete sections and bolt connectionsurfaces at these sections. The study applies this design method to select bolts and determine bolt dis-tribution at connection surfaces using parameters of the tunnel site's surrounding rock, cross-section dimensions, and support parameters. Additionally, it provides a segmentation scheme for prefabri-cated steel bar segments and validates the rationality of the assembled bolt joint design for secondary lining steel bars through numerical simulation. Results indicate that prefabricated bolt assembly redis-tributes stress in the two-liner structure, slowing down stress and deformation growth rates to achieve stabilization. Specifically, stress reductions of 58％ at the left arched shoulder and 53％ at the left arch foot are observed, accompanied by varied reductions in displacement. Although stress increases on the bolt connecting surface at the arch's base, the high bearing performance of the bolt reduces uplift, ef-fectively optimizing the structure.关键词
隧道工程/二衬钢筋装配化/极限承载力/螺栓接头设计/结构优化Key words
tunnel engineering/secondary lining reinforcement assembly/ultimate bearing capacity/bolted joint design/structural optimization分类
交通运输引用本文复制引用
王永东,胡志豪,任雨桐,薛威,史林猛,郑蓉军..公路隧道二衬钢筋装配化螺栓的接头设计[J].北京交通大学学报,2024,48(1):54-65,12.基金项目
国家自然科学基金(52278393) （52278393）
陕西省交通厅科技项目(22-50K) （22-50K）
中央高校基本科研业务费专项资金(300102212904)National Natural Science Foundation of China(52278393) （300102212904）
Science and Technology Project of Shaanxi Provincial Depart⁃ment of Transport(22-50 K) （22-50 K）
Fundamental Research Funds for the Central Universities(300102212904) （300102212904）
