铁道标准设计2025，Vol.69Issue(4)：50-56,7.DOI:10.13238/j.issn.1004-2954.202307210002
隧道地段双块式无砟轨道受力特性分析及优化设计
Analysis of Mechanical Characteristics and Optimized Design of Double-Block Ballastless Track in Tunnels
摘要
Abstract
To address the frequent occurrence of track slab defects in longitudinally connected double-block ballastless tracks in high-speed railway tunnels,an in-depth investigation and on-site inspection were conducted to analyze the characteristics of existing track defects.A refined global finite element model of the double-block ballastless track in tunnels was established to study the mechanical characteristics of the track slabs under factors such as different subgrade stiffness,temperature variations,and foundation deformations.Based on the analysis results,an optimized design for the double-block ballastless track structure in tunnels was proposed.The research results showed that:(1)on-site inspections revealed that full-depth transverse cracks in the longitudinally connected track slabs in tunnels were primarily located at the construction joints of the tunnel invert,which were identified as reflective cracks caused by the invert filling layer.(2)Under the action of concrete shrinkage,an increase in the longitudinal stiffness coefficient of the tunnel foundation resulted in higher tensile stress at the construction joints of the track slabs.(3)At the tunnel portal,with a negative temperature gradient of 45 ℃/m,the maximum track slab stress reached 2.02 MPa,while inside the tunnel,foundation deformations significantly affected stress levels,with a 15 mm foundation deformation leading to a maximum stress of 1.88 MPa.(4)Under the combined effects of concrete shrinkage and foundation settlement deformation,and considering crack propagation in the backfill layer,the maximum stress reached 2.61 MPa,making the track slabs susceptible to cracking.(5)To address the frequent cracking of longitudinally connected track slabs,a modular design for double-block ballastless track was proposed,suggesting track slab lengths of 6 m at tunnel portals and 12 m inside tunnels,along with a constraint-based connection scheme using embedded reinforcement between the track slab and the tunnel substructure.关键词
高速铁路/双块式无砟轨道/道床板裂纹/受力分析/结构优化Key words
high-speed railway/double-block ballastless track/track slab cracks/mechanical analysis/structural optimization分类
交通工程引用本文复制引用
郜永杰,秦永平,刘永存,刘杰..隧道地段双块式无砟轨道受力特性分析及优化设计[J].铁道标准设计,2025,69(4):50-56,7.基金项目
中国国家铁路集团有限公司科技研究开发计划项目(N2020G057) （N2020G057）
广东省交通运输厅科技项目(2021-J-001) （2021-J-001）
