摘要
小净距盾构叠落隧道面临二次扰动,施工风险高,隧道变形控制难题亟待解决。采用三维有限元分析手段,研究了区间位置关系对下线隧道变形的影响规律,探讨了叠落隧道变形控制方法的有效性。研究表明,叠落区间盾构施工引起的地表沉降持续增加;叠落隧道上线开挖时,下线隧道产生指向上线隧道的整体上浮;完全叠落施工对下线隧道的扰动更显著,影响范围也更大;随着隧道净距的增加,上线开挖的扰动有所降低;叠落隧道层间注浆和下线支撑台车联合加固的方法有效降低了叠落施工对下线变形的影响,其中隧道竖向收敛和水平收敛分别降低60.55%和41.40%。
The overlapping shield tunnel with a small clear distance faces secondary disturbance and high construction risk,and the tunnel deformation control problem needs to be solved urgently.The influence law of the position relationship on the deformation of the lower line tunnel was studied using the three-dimensional finite element analysis method.The effectiveness of the deformation control method was discussed then.The results show that the surface subsidence caused by shield construction of overlapping shield tunnels is increasing continuously.When the upper line of the tunnel is excavated,the lower line tunnel produces the overall buoyance pointing to the upper line tunnel.The disturbance of the lower tunnel caused by the complete overlaying construction is more significant,and the influence range is more extensive.The upper line excavation's disturbance decreases with the clear distance of the tunnels increase.The combined reinforcement method of interlayer grouting and underline supporting trolley effectively reduces the influence of overlaying construction on underline deformation.The vertical and horizontal convergences of the tunnel are reduced by 60.55%and 41.40%.
作者
石立民
杜有超
唐亮
孔祥勋
雷云生
邹焱林
SHI Li-min;DU You-chao;TANG Liang;KONG Xiang-xun;LEI Yun-sheng;ZOU Yan-lin(CCCC First Harbor Engineering Co.,Ltd.,300461,Tianjin,China;School of Civil Engineering,Harbin Institute of Technology,150090,Harbin,China;Chongqing Research Institute,Harbin Institute of Technology,401135,Chongqing,China)
出处
《建筑技术》
2023年第23期2919-2924,共6页
Architecture Technology
基金
重庆市自然科学基金项目(CSTB2023NSCQ-MSX0082)
住房和城乡建设部研究开发项目(2022-K-040,2022-K-086)。
关键词
施工扰动
变形控制
注浆加固
支撑台车
叠落隧道
construction disturbance
deformation control
grouting reinforcement
support trolley
overlaying tunnel Vol.54 No.23
作者简介
石立民(1972-),男,湖南长沙人,高级工程师,e-mail:496576466@qq.com.
