大断面地铁隧道开挖不同支护因素影响研究  

Study on the Influence of Different Supporting Factors on the Excavation of Large Section Subway Tunnel

作　　者：马晓亮 杨晓东 MA Xiao-liang;YANG Xiao-dong(Road&Bridge International Co.Ltd.,Beijing 100027,China)

机构地区：[1]中交路桥建设有限公司,北京100027

出　　处：《工程建设与设计》2020年第11期128-130,共3页Construction & Design for Engineering

摘　　要：大断面地铁隧道的开挖会引起较大的地表沉降,需要采取措施进行控制。论文以哈尔滨地铁3号线湘江路—会展中心区间大断面地铁隧道暗挖段工程为背景,采用FLAC3D有限差分软件建立隧道三维开挖模型,研究超前支护范围、开挖进尺、支护时间和衬砌刚度4个支护因素影响下大断面地铁隧道开挖引起的地表沉降规律。结果表明,开挖进尺和支护时间的改变对最大地表沉降以及沉降槽宽度影响显著,而超前支护范围和衬砌刚度的变化仅造成最大地表沉降的小幅改变。研究结果可为类似工程施工提供参考。The excavation of large section subway tunnel will cause large ground settlement,which needs to be controlled by measures.In this paper,based on the underground excavation project of the large section metro tunnel in Xiangjiang Road to exhibition center section of Harbin Metro Line 3,the FLAC3 D finite difference software is used to establish the three-dimensional excavation model of the tunnel,and the ground settlement law caused by the excavation of the large section metro tunnel under the influence of four supporting factors,namely the scope of advance support,excavation footage,support time and lining stiffness,is studied.The results show that the change of excavation footage and support time has a significant impact on the maximum surface settlement and settlement groove width,while the change of advance support range and lining stiffness only causes a small change in the maximum surface settlement.The research results can provide reference for similar engineering construction.

关 键 词：大断面隧道 支护因素 数值模拟 地表沉降 

分 类 号：TU94.2[建筑科学—建筑技术科学] U455.7[建筑科学—桥梁与隧道工程]