Deformation monitoring at shield tunnel joints:Laboratory test and discrete element simulation  

作　　者：Maoyi Mao Xiaowei Yang Chun Liu Tao Zhao Hui Liu 

机构地区：[1]School of Earth Sciences and Engineering,Nanjing University,Nanjing,China [2]Department of Civil and Environmental Engineering,Brunel University London,London,UK

出　　处：《Deep Underground Science and Engineering》2025年第1期149-157,共9页深地科学(英文)

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:41977218,42222707;State Key Laboratory for GeoMechanics and Deep Underground Engineering,Grant/Award Number:SKLGDUEK2117。

摘　　要：Shield tunnel,composed of several segments,is widely used in urban underground engineering.When the tunnel is under load,relative displacement occurs between adjacent segments.In the past,distributed optical fiber sensing technology was used to perform strain monitoring,but there is an urgent need to determine how to transform strain into displacement.In this study,optical frequency domain reflectometry was applied in laboratory tests.Aiming at the shear process and center settlement process of shield tunnel segments,two kinds of quantitative calculation methods were put forward to carry out a quantitative analysis.Meanwhile,the laboratory test process was simulated numerically utilizing the discrete element numerical analysis method.Optical fiber,an atypical geotechnical material,was innovatively applied for discrete element modeling and numerical simulation.The results show that the measured displacement of the dial gauge,the calculated results of the numerical model,and the displacement quantitatively calculated from the optical fiber data agree with each other in general.The latter two methods can potentially be utilized in engineering application of deformation monitoring at shield tunnel joints,but need to be further calibrated and adjusted in detail.

关 键 词：discrete element method distributed optical fiber MatDEM OFDR shield tunnel 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]