小曲率半径盾构隧道施工期管片上浮分析

Analysis of Segment Floating During Construction of Shield Tunnel with Small Curvature Radius

为解决小曲率半径盾构隧道施工中出现的管片上浮现象,依据天津地铁项目,通过分析造成管片上浮的原因,建立了小曲率半径盾构隧道管片上浮受力分析模型。结果表明:注浆产生的浆液浮力是造成管片上浮的主要原因,而曲线隧道中的千斤顶推力不均而产生的侧向分力也是影响管片上浮的重要因素。由此,对于控制管片上浮提出了针对性措施。

In order to solve the segment floating phenomenon in shield tunnel construction with small curvature radius,according to the Tianjin Metro project,the force analysis model of segment floating in shield tunnel with small curvature radius is established by analyzing the causes of segment floating.The results show that the buoyancy of slurry produced by grouting is the main cause of segment floating,and the lateral component force caused by uneven jack thrust in curved tunnel is also an important factor affecting segment floating.Therefore,targeted measures are put forward to control the segment floating.