双线地铁隧道泥水及土压平衡盾构施工地层变形特征研究  

Ground Deformation Characteristics of Double-track Metro Tunnel Bored by Slurry Balance Shield and EPB Shield

作　　者：吴红博[1] 周传波[1] 蒋楠[1] 高坛 WU Hongbo;ZHOU Chuanbo;JIANG Nan;GAO Tan(Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《隧道建设（中英文）》2019年第2期219-226,共8页Tunnel Construction

摘　　要：为分析圆砾地层双线地铁隧道分别采用泥水和土压平衡盾构施工时的地层变形特征,以南宁地铁3号线东葛路站—滨湖路站区间盾构施工工程为背景,采用现场监测数据分析2种盾构施工时的地表横向沉降特征和监测点纵向沉降历程特征。利用FLAC3D软件对2种盾构工法进行简化模拟,验证模拟方法的可行性;设计双线地铁隧道分别采用土压平衡盾构和泥水平衡盾构、全部采用泥水平衡盾构、全部采用土压平衡盾构3种工况的模拟方案,研究3种工况下的地层变形特征。研究结果表明:1)双线地铁隧道采用2种类型盾构施工时,地层沉降曲线偏向土压平衡盾构施工的隧道一侧;采用同种类型盾构施工时,地层距离隧道越近,沉降曲线呈"W"特征越明显; 2)双线地铁隧道采用土压平衡盾构施工时各地层沉降较大,地表横向沉降影响范围约50 m;采用泥水平衡盾构施工时各地层沉降相对较小,地表横向沉降影响范围约30 m; 3) 3种工况下,双线地铁隧道采用土压平衡盾构施工时引起的地表水平位移最大。The horizontal ground settlement characteristics and longitudinal settlement characteristics of monitoring point of Donggelu Station-Binhulu Station shield tunnel on Nanning Metro Line No. 3 bored by slurry balance shield and EPB shield are analyzed by field monitoring data. The software FLAC 3D is used to simplify the simulation of the two shield construction methods, and the monitoring results are used to verify the feasibility of the simulation method. Three working conditions, tunnels bored by slurry balance shield and EPB shield respectively, tunnels bored by slurry balance shield and those bored by EPB shield, are designed and simulated, and corresponding ground deformation characteristics are studied. The study results show that:(1) When the tunnels are bored by slurry balance shield and EPB shield respectively, the ground settlement curve is biased towards the side of the tunnel bored by EPB shield;when the tunnels are bored by slurry/EPB shield, the closer the ground to the tunnel, more obvious the "W"-shape of the settlement curve presents.(2) When the tunnels are bored by EPB shield, the ground settlement is large, and the influencing range of surface settlement is about 50 m;however, when the tunnels are bored by slurry balance shield, the ground settlement is relevant small, and the influencing range of surface settlement is about 30 m.(3) The horizontal surface displacement is the largest when the tunnels are bored by EPB shield.

关 键 词：双线地铁隧道 土压平衡盾构 泥水平衡盾构 地层变形 现场监测 数值模拟 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]