盾构隧道管片拼装纵缝变形规律研究

On the Deformation Law of Longitudinal Joints of Shield Tunnel Segment Rings

文章基于对管片拼装阶段的拼装过程以及管片受力情况的分析,采用有限元软件对不同拼装椭圆度、不同封顶块位置下的纵缝张角变化规律进行了研究,并在此基础上计算得出封顶块处于最不利位置时密封垫处的最大内外张开量。研究结果表明,在管片拼装阶段,拼装椭圆度与管片间张角呈线性关系;在相同拼装椭圆度下,封顶块位置对张角的大小有影响,在封顶块位置角度为±32.7276°时张角最大,并且在该位置下椭圆度为±5‰D时密封垫处的最大张开量为5.1 mm。

By analyzing the segment erection process and the force applied on the segment,a finite-element method was adopted to study the variation law of the opening angles of longitudinal joints under different erection ovalities and different positions of the key segments.Additionally,the maximum internal and external openings at the sealing gasket were calculated for when the key segment is at the most unfavorable position.Research results indicate that： there is a linear relationship between the erection ovality and the segment opening angle,the position of the key segment affects the magnitude of the opening angle under the same erection ovality,the opening angle is at a maximum when the key segment is positioned at an angle of ±32.7276°,and the maximum opening at the sealing gasket is 5.1mm under the ovality of ±5‰D at this position.