软土地层盾构隧道管片上浮影响因素有限元分析  

Finite Element Analysis of the Influencing Factors on the Floating of Shield Tunnel Segments in Soft Soil Strata

作　　者：张宝成[1] 贺文喆 关伟[2] 罗治斌 黄明利[4] 吴啸宇 ZHANG Baocheng;HE Wenzhe;GUAN Wei;LUO Zhibin;HUANG Mingi;WU Xiaoyu(Jilin Transportation Vocational and Technical College,Changchun 130015;China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300222;China Railway 18th Bureau Group Fourth Engineering Co.,Ltd.,Tianjin 300131;Beijing Jiaotong University,Beijing 100044)

机构地区：[1]吉林交通职业技术学院,长春130015 [2]中铁十八局集团有限公司,天津300222 [3]中铁十八局集团第四工程有限公司,天津300131 [4]北京交通大学,北京100044

出　　处：《都市快轨交通》2024年第6期64-70,共7页Urban Rapid Rail Transit

基　　金：国家自然基金面上项目(51878037)。

摘　　要：为了研究掘进速度和浆液凝胶时间对盾构隧道管片上浮的影响,依托苏州地铁5号线通园路站-星港街站盾构区间,采用Winkler弹性地基梁建立盾构管片三维有限元荷载结构模型,考虑同步注浆和二次补浆对管片产生的动(静)上浮力,分析掘进速度和注浆凝胶时间对管片上浮和错台的影响。研究结果表明:管片上浮和错台随着盾构掘进速度的增加而增大,上浮主要出现在浆液未凝固段管片底部,错台主要出现在浆液未凝固段与盾尾段和浆液凝固段的交界处,为避免管片上浮量和错台量超过规范要求,盾构掘进速度不能超过10环/d;随着浆液凝胶时间的延长,管片上浮量和错台量逐渐增大,选用速凝早强的双液浆进行背后注浆有利于控制盾构隧道上浮。This study examines the impact of shield tunneling excavation speed and slurry solidification time on the buoyancy of tunnel segments,focusing on the section between Tongyuan Road Station and Xinggang Street Station on Suzhou Metro Line 5.A three-dimensional finite element model of shield tunnel segments was developed using Winkler elastic foundation beams,considering the dynamic and static buoyancy effects generated by synchronous and secondary grouting on the pipe segments.The analysis assessed how excavation speed and grouting solidification time influence the uplift and misalignment of the segments.Results showed that both uplift and misalignment increased with higher tunneling speeds.The upward floating problem mainly occurs at the bottom of the pipe segment in the nonsolidified section of the slurry,whereas the misalignment mainly occurs at the junction between the nonsolidified section and the shield tail section,as well as between the nonsolidified section and the solidified section of the slurry.To avoid floating and misalignment of the pipe segments from exceeding the specification requirements,the excavation speed of the shield machine should not exceed 10 rings per day.Furthermore,it was observed that as the solidification time of the slurry increased,the amount of floating and misalignment of the tunnel segments gradually increased.Therefore,the use of a fast-setting and early strength dual liquid slurry is beneficial for controlling the floating ofshieldtunnels.

关 键 词：城市轨道交通 软土地层 盾构隧道 管片上浮 掘进速度 凝胶时间 数值分析 

分 类 号：U231[交通运输工程—道路与铁道工程]