超大直径顶管群下穿京沪铁路的设计研究  

Design Research on the Super-large Diameter Pipe Jacking Cluster Jacking through Beijing-Shanghai Railway

作　　者：冯印[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2015年第8期12-19,共8页Journal of Railway Engineering Society

摘　　要：研究目的:超大直径顶管群曲线顶进穿过京沪铁路路基,不可避免对管道周围土体产生扰动,通过仿真计算研究不同顶进次序对铁路路基及轨道的变形影响,以及对该变形的影响进行评估,并结合地质资料提出袖阀管注浆加固路基方案,以指导顶管群安全穿过运营铁路。研究结论:(1)考虑不同顶管顶进次序的相互影响,顶进所引起的铁路路基最终变形呈沉降槽形式,变形区域边界线水平倾角近45。;(2)不同顶进次序引起的路基变形差别主要体现在不同位置发生的时间不同,最终变形差异并不大;(3)顶管作业对铁路的影响主要从路基沉降量和轨道短弦矢度值进行评估,仿真计算表明轨道短弦最大矢度值未超过要求;(4)沉降槽曲线表明路基面最大沉降量已超过10 mm,可通过袖阀管注浆加固以满足既有路基技术要求;(5)该研究成果对于采用非明挖方式下穿铁路结构的安全评估及设计具有参考价值。Research purposes： The super - large diameter pipe jacking cluster jacking through Beijing - railway subgrade in curve manner will inevitably disturb the soil around the pipelines. The effect of differen orders on the deformation of railway roadbed and track is analyzed and evaluated via simulation calculation, scheme of sleeve valve pipe grouting for roadbed reinforcement is proposed according to geological data, in enable pipe jacking cluster to safely run through the railways in operation. Shanghai t jacking and the order to Research conclusions： （ 1 ） Given the effect of different jacking orders, the final deformation of railway subgrade caused by jacking is line for 45°. expressed as settlement trough form, with horizontal inclination angle around deformation region boundary （2） The subgrade deformation will occur at different locations in different times caused by different jacking sequences, with little difference between the final deformations. （3） The influence of pipe jacking on the railway is assessed according to the settlement of subgrade and the vector value of track＇ s short chord, and the simulation calculation results show that the maximum vector value of the track＇ s short chord does not exceed （4） The settlement curve displays that the maximum settlement of subgrade surface has exceeded the requirements. 10 mm, and thus grouting sleeve valve pipe for reinforcement can meet existing subgrade technology requirements. （5）The research results have value in safety evaluation and design of structures through railway without open excavation.

关 键 词：顶管 路基 轨道 沉降 袖阀管 注浆 

分 类 号：U213.1[交通运输工程—道路与铁道工程]