铁道科学与工程学报2025，Vol.22Issue(3)：1215-1228,14.DOI:10.19713/j.cnki.43-1423/u.T20240846
超高性能混凝土提升预制沟道管廊接头力学性能研究
Enhancement of mechanical performance of precast utility tunnel manhole joints with UHPC ultra-high performance concrete
摘要
Abstract
Precast utility tunnels,as a type of urban underground branch utility corridor,are typically installed at shallow depths with significant vertical loads above them.This makes the joint connections susceptible to localized damage and misalignment of the tunnel sections,which can lead to significant deformations and result in the malfunction of the pipelines within the corridor.This study employed experimental and theoretical analysis methods to investigate the effectiveness of using Ultra-High Performance Concrete(UHPC)material to enhance the mechanical performance of tunnel manhole joints and to develop calculation methods for their load-bearing capacity.The artical began with full-scale experiments to examine the mechanical performance of tunnel joints after reinforcing the haunched area with UHPC material.Subsequently,the ABAQUS software was utilized to construct a finite element model of the utility tunnel.After validation,the model was used to analyze the impact of multiple parameters,such as the length and height of the haunched area and the strength of the UHPC,on the joint's load-bearing capacity.The experimental results indicate that by replacing 10%of the ordinary concrete material in the tunnel with UHPC material,the joint's bending resistance increased by 134%,and the joint's bending stiffness increased by 165%.The shear capacity is enhanced by 179%,and the joint's shear stiffness increased by 118%,demonstrating that this localized reinforcement method is feasible and effective.The analysis shows that for every 20 mm increase in the height of the UHPC-strengthened haunched area of the tunnel,the bending and shear load-bearing capacities increase by 42 kN∙m and 38 kN,respectively.For every 20 MPa increase in the strength of the UHPC material,the joint's bending and shear load-bearing capacities increase by 68 kN‧m and 37 kN,respectively.When the length of the UHPC-strengthened haunched area of the tunnel is increased by 100 mm,the joint's bending load-bearing capacity is raised by 44 kN∙m.An increase in the pretension force of the steel bars by 25 kN can result in a 30 kN increase in the joint's shear load-bearing capacity,and doubling the number of steel bars from two to four leads to a 196 kN increase in the joint's shear load-bearing capacity.The formulas derived for the joint's bending and shear load-bearing capacities from this study show good agreement with the experimental results and can be applied in the engineering design.关键词
沟道式管廊/超高性能混凝土/力学性能/ABAQUS/承载力计算方法Key words
utility tunnel with channel design/Ultra-High Performance Concrete(UHPC)/mechanical properties/ABAQUS/load-bearing capacity calculation method分类
建筑与水利引用本文复制引用
付伟庆,黄鑫,王鑫鹏,苗圃,侯东帅,王建..超高性能混凝土提升预制沟道管廊接头力学性能研究[J].铁道科学与工程学报,2025,22(3):1215-1228,14.基金项目
国家重点研发计划(2018YFC0704804) （2018YFC0704804）
国家自然科学基金资助项目(52178488) （52178488）
上海市工程技术研究中心建设专项(17DZ2251800) （17DZ2251800）
