大直径跨海盾构隧道U型段管片纵向应力现场实测分析  

Field Measurement and Analysis of Longitudinal Stress in U-Shaped Segment of Large Diameter Cross Sea Shield Tunnel

作　　者：孔德芒 KONG Demang(China Railway 14th Bureau Group No.2 Eagincering Co.L.ld.,Taian Shanclong 271000,China)

机构地区：[1]中铁十四局集团第二工程有限公司,山东泰安271000

出　　处：《铁道建筑技术》2024年第1期168-171,共4页Railway Construction Technology

基　　金：中铁十四局集团有限公司资助立项项目(2023-A02)。

摘　　要：大直径跨海盾构隧道在施工阶段管片衬砌受力比较复杂,在水土荷载和施工荷载的耦合作用下极易引起工程病害。依托广湛高铁湛江湾海底隧道项目,基于无线自动化监测方式在湛江湾主航道隧道U型段转弯点处搭建盾构隧道结构健康监测系统,对管片的纵向应力进行实测分析。研究结果表明:纵向应力的变化大致历经4个阶段,即逐渐增大(脱离盾尾前)→剧烈波动(刚脱出盾尾)→逐渐减小(浆液粘结阶段)→阶梯形缓慢增长(后期稳定阶段)。'The stress on the segment lining of large diameter cross sea shield tunnels during the construction stage is relativelycomplex,and it is easy to cause engineering discases under the coupling effect of soil and water loads and construction loads.This article relies on the Zhanjiang Bay Submarine Tunnel Project of the Cuangzhou-Zhanijiang High-speed Railway,and buildsa shield tunncl structural health monitoring system at the U-shaped turning point of the Zhanjiang BayMain Channel Tunnclusing wireless automation monitoring method.The longitudinal stress of the segments is measured and analyzed."The researchresults indlicate that the varisation of longitudinal stress roughly goes through four stages,namely gradually increasing(beforedetachment from the shield tail),violently fluctuating(just detachment from the shield tail),gradually decreasing(slurybording stage),and gradually increasing in a slepped shape(late stable stage).

关 键 词：跨海盾构隧道 U型段 自动化监测 施工阶段 ―纵向应力 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]