同济大学学报（自然科学版）2024，Vol.52Issue(12)：1823-1833,11.DOI:10.11908/j.issn.0253-374x.22517
矩形管片隧道纵向等效抗弯刚度与抗弯性能研究
Longitudinal Equivalent Bending Stiffness and Bending Performance of Rectangular Segmented Tunnel
摘要
Abstract
Based on the equivalent continuous model,this paper deduces the longitudinal equivalent bending stiffness of rectangular shield tunnels under the combination state of compression and bending.Considering the cross-sectional characteristics of rectangular shield tunnels,the closed-form solution of the equivalent bending stiffness under four neutral axis positions is discussed,based on which,a parametric analysis,using the new analytical solution,is conducted to investigate the effect of key parameters on the longitudinal bending stiffness,including the ratio of compression to bending,the number of bolts,the ratio of width to thickness and so on.The critical value of N-M ratio for different positions of the neutral axis is further obtained.The results show that the longitudinal bending stiffness efficiency increases with the increase of the compression-bending ratio,the number of bolts and the ring width-to-thickness ratio,but decreases with the increase of the sectional width-to-thickness ratio and aspect ratio.The position of the neutral axis is not only related to the size of the cross-section and material properties,but also to the compression-bending ratio.The critical value of N-M ratio decreases with the increase of sectional width-thickness ratio and is sensitive to the change of sectional shape.The conclusion has important theoretical reference for optimal selection and design calculation of rectangular segments.关键词
矩形盾构隧道/等效连续化模型/等效抗弯刚度/纵向抗弯性能Key words
rectangular shield tunnel/equivalent continuous model/effective bending stiffness/longitudinal bending performance分类
建筑与水利引用本文复制引用
刘颖彬,廖少明,李志义,钟铧炜,滕政伟..矩形管片隧道纵向等效抗弯刚度与抗弯性能研究[J].同济大学学报（自然科学版）,2024,52(12):1823-1833,11.基金项目
国家自然科学基金项目(52090082) （52090082）
中央高校基本科研业务费专项基金(22120210428) （22120210428）
