铁路隧道仰拱隆起及无砟轨道上拱变形规律研究
Research on the Law of Inverted Arch Uplift and Ballastless Track Arching Deformation in Railway Tunnels
赵一馨 1赵磊 2宋慧来 3赵国堂4
作者信息
- 1. 中国铁道科学研究院集团有限公司基础设施检测中心,北京 100081
- 2. 中国铁道科学研究院集团有限公司铁道建筑研究所,北京 100081
- 3. 西南交通大学土木工程学院,四川成都 610031
- 4. 中国国家铁路集团有限公司,北京 100844
- 折叠
摘要
铁路隧道仰拱隆起及其引起的无砟轨道上拱变形,已成为高速铁路线路局部区段限速运行的主要原因.仰拱隆起病害的产生与泥岩膨胀及地下水的渗透作用密切相关.基于泥岩膨胀力与高水压在隧底的局部作用及其引起的隧底结构局部效应,提出仰拱隆起及无砟轨道上拱的结构-荷载计算模型.计算结果表明:隧底荷载作用和仰拱厚度不足对仰拱隆起及无砟轨道上拱变形的影响呈现非线性特征,若荷载1MPa以上及仰拱欠厚0.2 m以上,仰拱隆起及无砟轨道上拱变形急剧增加;仰拱施工缝等薄弱处所将会引起上拱变形峰值的出现;在相同条件下,单线隧道的上拱变形可以减少90％以上.
Abstract
The inverted arch uplift and the resultant ballastless track arching deformation in the railway tunnel have become the primary reasons for speed restrictions in specific sections of HSR lines.The occurrence of inverted arch uplift diseases is closely related to mudstone expansion and groundwater seepage.Based on the local effects of mudstone expansion force and high water pressure at the tunnel bottom,as well as the resultant local effects on the tunnel bottom structure,this paper proposes a structure-load calculation model for inverted arch uplift and ballastless track arching deformation.The calculation results indicate that the effects of tunnel bottom load and insufficient inverted arch thickness on inverted arch uplift and ballastless track arching deformation exhibit non-linear characteristics.When the load exceeds 1 MPa and the inverted arch thickness is deficient by more than 0.2m,the inverted arch uplift and ballastless track arching deformation increase sharply.Weak areas such as construction joints in the inverted arch may result in the occurrence of peak values of arching deformation.Under the same conditions,the arching deformation in single-track tunnels can be reduced by more than 90％.
关键词
铁路隧道/隧底荷载/无砟轨道/仰拱隆起/上拱变形/仰拱缺陷Key words
railway tunnel/tunnel bottom load/ballastless track/inverted arch uplift/arching deformation/inverted arch defect引用本文复制引用
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(J2023G014)
国家自然科学基金项目(52278466)
出版年
2024
NETL
NSTL
万方数据