盾构隧道下穿铁路框架桥涵变形控制技术  

RESEARCH ON DEFORMATION CONTROL TECHNOLOGY OF SHIELD TUNNEL UNDERPASS RAILWAY FRAME BRIDGE AND CULVERT

作　　者：刘伟 孙捷城 Liu Wei;Sun Jie-cheng

机构地区：[1]济南轨道交通集团有限公司,济南250101

出　　处：《建筑技术开发》2022年第9期86-89,共4页Building Technology Development

基　　金：山东省重点研发计划项目(2021CXGC011203);山东省自然科学基金(ZR2020QE269);山东省住建厅科学技术项目(2019-K7-12)。

摘　　要：以济南轨道交通1号线盾构隧道下穿京沪铁路框架桥涵为工程依托,通过数值模拟分析了盾构下穿施工引起的铁路框架桥涵变形及列车荷载作用下的轨道变形规律,提出了盾构下穿铁路框架桥涵变形控制技术。研究表明:(1)位于铁路路基下方的隧道变形明显大于框架桥涵下方,需重点对路基下方的隧道进行加固与变形控制;(2)客车荷载作用下路基变形增大了17.8%,货车荷载作用下增大了27.7%,施工期间对列车进行限速有利于路基变形控制;(3)通过路基段袖阀管注浆加固、施工期间列车限速等变形控制措施,保障了铁路运营安全。Based on the engineering background of the shield tunnel of Jinan metro line NO.1 undercrossing Beijing-Shanghai railway frame bridge and culvert, the deformation laws of railway frame bridge and culvert and track under train load caused by shield undercrossing construction were analyzed by numerical simulation.The deformation control technology of shield undercrossing construction was put forward.The results show as follow.First, the deformation of the tunnel under the railway subgrade is obviously larger than that under the frame bridge and culvert, so it is necessary to strengthen and control the deformation of the tunnel under the railway subgrade.Second, the roadbed deformation increases by 17.8% under the loading of passenger cars and 27.7% under the loading of trucks, which indicates that the speed limit of trains during construction is beneficial to the control of roadbed deformation. Third, the safety of railway operation is ensured through deformation control measures such as sleeve valve pipe grouting reinforcement in subgrade section and train speed limitation during construction.

关 键 词：盾构下穿 铁路桥涵 变形控制 注浆加固 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]