Analytical and numerical analysis on the torsional performance of elliptically deformed tunnels in the longitudinal direction

作     者：Yingbin Liu Shaoming Liao Mengbo Liu Lisheng Chen Zhiyi Li 

作者机构：Department of Geotechnical EngineeringTongji UniversityShanghai 200092China Shanghai Urban Construction Municipal Engineering Co.LtdShanghai 200065China 

出 版 物：《Underground Space》 (地下空间（英文）)

年 卷 期：2023年第12卷第5期

页      面：183-201页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：support of the National Natural Science Foundation of China(Grant No.52090082) the Fundamental Research Funds for the Central Universities of China(Grant No.22120210428) 

主　　题：Segmental tunnel Torsional deformation Longitudinal equivalent continuous model Longitudinal torsional stiffness Transverse bending stiffness 

摘      要：Segmental lining structures constructed by shields/tunnel boring machines are often subjected to uneven longitudinal cross-section torsion as a result of eccentric external loads,which is extremely adverse to tunnel safety but has not received sufficient attention for a long *** figure out the torsional performance of segmental tunnels,it is essential to assess the longitudinal torsional stiffness and active-torsion-rejection capability of a segmented *** aim of the paper is to derive an analytical solution to the longitudinal torsional stiffness of a segmental tunnel with existing elliptical *** longitudinal torsional stiffness under different internal force combinations is deduced considering the longitudinal axial force and bending moment based on the equivalent continuous model and force balance *** validity of the analytical solution is verified by comparing it with finite element method ***,a parametric analysis,using the new analytical solution,is included to investigate the effect of the key parameters on torsional behaviors,including the segment size,the bolt size and the transverse bending stiffness,*** is found that:(1)the longitudinal torsional stiffness efficiency(LTSE)of the segmental tunnel decreases with the rise of segment thickness to diameter ratio but increases with the ring width to diameter ratio;(2)the LTSE reduces with the increase of the effective shear length but rises with the diameter of bolts;(3)the LTSE increases rapidly with the ratio of compression-torsion or ***,the envelope curve of the critical load(N0,M0)for a tunnel to actively resist a certain internal torque is *** proposed solution can be easily utilized to determine the longitudinal torsional stiffness of segmental tunnels and is an effective tool for tunnel design and maintenance.