地铁车站洞桩法施工地表沉降控制研究  

Research on surface settlement control during the construction of subway station tunnel pile method

作　　者：李赛格 刘宁 Li Saige;Liu Ning(Hunan Institute of Traffic Engineering,Hengyang Hunan 421001,China)

机构地区：[1]湖南交通工程学院,湖南衡阳421001

出　　处：《山西建筑》2024年第18期159-161,173,共4页Shanxi Architecture

基　　金：湖南省“十四五”应用特色学科:“交通运输工程”项目(湘教通[2022]351号)。

摘　　要：城市地铁车站洞桩法施工将对地表安全造成影响,以北京地铁12号线某车站为研究对象,通过划分洞桩法施工阶段,利用FLAC3D有限差分软件对洞桩法施工过程进行了数值模拟研究,对各阶段地表沉降变化规律进行了分析。研究结果表明:地表沉降沿车站中线呈双凹槽对称分布,主要影响区域在距车站中线40 m范围内;车站整体施工中,地表沉降量呈现先增加后减小的现象,过程沉降最大值为40.7 mm,最终沉降最大值为33.5 mm;导洞施工阶段、扣拱施工阶段产生的地表沉降占最大沉降量的60%和30%,是造成地表沉降的重要阶段,在该阶段采取措施能有效控制地表沉降。The construction of tunnel pile method in urban subway stations will have an impact on surface safety.Taking a station on Beijing Metro Line 12 as the research object,the construction stages of tunnel pile method were divided,and numerical simulation research was conducted on the construction process of tunnel pile method using FLAC3D finite difference software.The variation law of surface settlement in each stage was analyzed.The research results indicate that:surface subsidence is symmetrically distributed along the centerline of the station in a double groove pattern,with the main affected area within a range of 40 meters from the centerline of the station;during the overall construction of the station,the surface settlement showed a phenomenon of first increasing and then decreasing.The maximum settlement during the process was 40.7 mm,and the final maximum settlement was 33.5 mm.The surface settlement generated during the construction phase of the guide tunnel and the arch construction phase accounts for 60%and 30%of the maximum settlement,which is an important stage causing surface settlement.Measures taken during this stage can effectively control surface settlement.

关 键 词：洞桩法 数值模拟 地表沉降 

分 类 号：TU997[建筑科学—市政工程] U455[建筑科学—桥梁与隧道工程]