盾构隧道管片超弹性密封垫临界错位研究  

Study on Critical Dislocation of Hyperelastic Sealing Gasket for Segmental Linings of Shield Tunnels

作　　者：郭璇[1,2] 原森阳 李志通[3] 戴乐辉 彭瑾 GUO Xuan;YUAN Senyang;LI Zhitong;DAI Lehui;PENG Jin(Key Laboratory of Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Shijiazhuang Institute of Railway Technology,Shijiazhuang 050041,China)

机构地区：[1]北京交通大学城市地下工程教育部重点实验室,北京100044 [2]北京交通大学土木建筑工程学院,北京100044 [3]石家庄铁路职业技术学院,河北石家庄050041

出　　处：《铁道学报》2024年第12期170-179,共10页Journal of the China Railway Society

基　　金：中国国家铁路集团有限公司科技研究开发计划(N2022G063,N2021G057)。

摘　　要：盾构隧道的管片错台是引发接缝渗水的关键因素,管片密封垫临界错位量的确定一直是本领域的研究难题。为研究管片接缝处密封垫在水压下的防水机制,建立接触耦合超弹性有限元模型,模拟水压侵入接缝处密封垫的动态变形过程,分析不同错台量密封垫的超弹性接触应力分布、占比及其对应的防水性能。对比有限元结果与试验数据表明,二者发展趋势呈正相关,有效接触应力占比越低,渗漏风险越大。有限元计算结果整体略低于试验结果,偏安全。有限元结果适用于评估管片密封垫临界错位量及防水性能。随错台量增加,密封垫与密封槽及密封垫间的有效接触应力占比先减小后增大。管片直径13 m的分析案例产生9 mm错台量和8 mm张开量时,其有效接触应力占比最低,防水性能最差,是多接触错位量的计算临界点。本研究为盾构隧道管片设计与施工提供密封垫临界错位量的科学计算依据参考,有助于优化接缝密封性能管理,减少渗水事故。Segment misalignment in shield tunneling is a key factor leading to joint leakage.Determining the critical misalignment amount for segment sealing gaskets has been a challenging research issue in this field.To study the waterproofing mechanism of the sealing gasket at the segment joint under water pressure,a contact-coupled hyperelastic finite element analysis model was established to simulate the dynamic deformation process of the sealing gasket under water pressure intrusion and analyze the hyperelastic contact stress distribution and proportion for gaskets with different misalignment amounts,as well as their corresponding waterproof performance.The comparison of finite element results with experimental data shows a positive correlation in their development trends,with a lower effective contact stress proportion corresponding to a higher risk of leakage.The finite element results are slightly lower than experimental results,indicating a favor of safety.The finite element results are applicable for evaluating the critical misalignment amount and waterproof performance of segment sealing gaskets.As the misalignment amount increases,the proportion of effective contact stress between the sealing gasket and the sealing groove first decreases before increasing.In the analysis case of a 13 m diameter segment,the lowest proportion of effective contact stress and the worst waterproof performance occur at 9 mm of misalignment and 8 mm of opening,representing a critical point for multiple contact misalignment calculations.This study provides a scientific basis for calculating the critical misalignment amount of segment sealing gaskets,offering reference for optimizing joint sealing performance management and reducing leakage incidents in shield tunnel segment design and construction.

关 键 词：盾构隧道 接缝防水 超弹性本构模型 有效接触应力比 临界错位量 

分 类 号：U45[建筑科学—桥梁与隧道工程]