盾构下穿铁路框架桥中路面沉降变形规律分析  

An analysis of the deformation regulation of road settlement when shield underneath passing the railway frame bridge

作　　者：郑明新[1] 吴勇[1] 黄文君[1] 欧阳林[1] 胡国平[1] 

机构地区：[1]华东交通大学岩土与道桥工程研究所,江西南昌330013

出　　处：《西安理工大学学报》2015年第1期78-82,共5页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51068006)

摘　　要：以南昌地铁1号线盾构下穿京九铁路框架桥工程实例为背景,通过对现场监测数据分析,得到了盾构单线隧道施工引起市政道路路面纵横沉降变形规律：盾构刀盘前10m以内和后20m以内为影响区域,其中刀盘前后10m为显著影响区,在纵断面上沿盾构中心轴线左右两侧4∽8m为横向主要影响范围;在整个穿越过程中,盾构施工引起上部铁路框架桥竖向位移特征与公路路面沉降规律基本相似,其沉降量或隆起量均在控制范围内,表明在盾构穿越过程中土压力、注浆压力和注浆量三个影响地表沉降因素的取值是可行的。Taking the Nanchang Metro Line 1shield underneath passing the frame bridge of Jingjiu Railway as object,based on the in-situ monitoring data analysis,the deformation laws of the shield single line tunnel construction settlement of municipal road surface caused by vertical and horizontal can be obtained：The shield cutter head within 10 mbefore and within 20 mafter can be served as the area of influence,of which within 10 mbefore and after is significantly affected area,and in the vertical,the shield for the transverse main impact range is the section along the central axis 4∽8 mleft and right sides.Through the whole process,the vertical displacement characteristics of the upper frame rail bridge caused by shield construction are substantially similar with the settlement laws of the road,whose amount of settlement or uplift are under control,whereby showing that the earth pressure,grouting pressure and quantity of grouting affecting the value of facts of surface subsidence is feasible during the shield process.

关 键 词：盾构下穿 铁路框架桥 现场监测 变形规律 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]