城市道路下穿京沪高铁方案设计研究  

Research on the Design of Urban Road Underpass Beneath the Beijing-Shanghai High-speed Railway

作　　者：柴聚奎 CHAI Jukui(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100005

出　　处：《铁道勘察》2024年第6期136-142,共7页Railway Investigation and Surveying

基　　金：中国中铁股份有限公司科技开发计划重点课题(产品-研-2016-33-2)。

摘　　要：为探究城市道路下穿高铁对既有铁路的影响,采用有限元软件模拟分析的方法,通过对道路设计方案、管线布置及现状地质情况进行综合分析,分别从防撞护栏设置、地基加固处理、管道铺设、监控等方面出发,提出相应专项设计方案。计算结果显示,道路施工引起的桥墩最大横向位移为0.38 mm,最大纵向位移为0.167 mm,最大竖向沉降为0.77 mm,桥梁桩基轴力最大增加28.4 kN,其位移和桩基轴力变化均在安全范围内。墩身防撞分析证明了防撞护栏的有效性,道路工后沉降对高铁桥桩的影响也被显著降低,从而证明所提出涉铁专项方案可以有效减少施工对既有高铁桥桩的影响,保障铁路安全。To investigate the impact of urban road underpasses on existing high-speed railway,this paper employed the finite element software simulation analysis.Through a comprehensive evaluation of road design schemes,pipeline layouts,and current geological conditions,specialized design proposals were formulated,encompassing aspects such as the installation of crash barriers,foundation reinforcement,pipeline laying,and monitoring measures.The calculation results indicate that,the maximum lateral displacement of bridge piers induced by road construction is 0.38 mm,the maximum longitudinal displacement is 0.167 mm,and the maximum vertical settlement is 0.77 mm.Furthermore,the maximum increase in axial force of bridge pile foundations is 28.4 kN.Both the displacement and axial force changes of pile foundations fall within safe limits.The analysis of pier collision resistance verifies the effectiveness of the crash barriers,and the impact of post-construction road settlement on high-speed railway bridge piles is significantly reduced.Consequently,it is demonstrated that the proposed railway-related specialized scheme can effectively mitigate the construction's influence on existing high-speed railway bridge piles,thereby ensuring railway safety.

关 键 词：高速铁路 道路下穿 监控量测 工后沉降 位移云图 桩基轴力 

分 类 号：U238[交通运输工程—道路与铁道工程] TU47[建筑科学—结构工程]