某沉管隧道病害分析及处置措施构思  

Analysis of Diseases and Treatment Measures for an Immersed Tunnel

作　　者：孙超 张光伟 答武强 余祖峰 SUN Chao;ZHANG Guangwei;DA Wuqiang;YU Zufeng(China Railway Liuyuan Group Co.,Ltd.,Tianjin 300000,China)

机构地区：[1]中铁第六勘察设计院集团有限公司,天津300000

出　　处：《隧道建设(中英文)》2025年第2期415-424,共10页Tunnel Construction

摘　　要：为保障运营沉管隧道的服务能力和通行安全,以某运营沉管隧道工程病害处治为例,采用现场调查的方式搜集隧道病害情况,通过检测方式分析沉管隧道运营过程中的病害成因,提出保证沉管隧道安全运营的处治措施。病害处治主要包括基础处理和剪切键修复2方面。其中,针对基础处理,对比分析水平定向注浆方案和底板注浆方案;剪力键修复着眼于对受损钢剪力键的加固而非替换,对比分析侧墙W型钢板加固、剪力键粘钢修复和中廊道增设抗剪框架3种修复方案。结果表明:1)运营沉管隧道病害表现为基础垫层脱空、路面裂缝及剪力键损坏,导致病害的直接原因是隧道管节间的不均匀沉降,而不均匀沉降又与运营阶段河道回淤或冲刷、基础垫层疏松和脱空等因素密切相关;2)底板注浆方案施工便捷、对周边环境影响较小,能以较小代价达到预期的控制不均匀沉降的目的;3)W型钢板加固方案能更有效地提高中隔墙混凝土剪切键抗剪承载力,且施工工艺简单。综合考虑,本工程推荐采用W型钢板加固方案和底板注浆方案处治工程病害。The authors present a case analysis of diseases in an operational immersed tunnel.Field investigations are conducted to assess the tunnel′s condition,and the causes of tunnel diseases are examined using diagnostic methods.Based on the findings,treatment measures are proposed to ensure the tunnel′s safe operation.The primary interventions include foundation treatment and shear key repair.For foundation treatment,the horizontal directional grouting and floor grouting methods are compared and analyzed.The shear keys are reinforced through different repair approaches,including the reinforcement of W-steel plates on the sidewall,the repair of shear key steel adhesion,and the addition of a shear frame in the middle corridor.The results indicate the following:(1)The operational immersed tunnel exhibits foundation cushion voids,pavement cracks,and shear key damage,primarily caused by uneven settlement between tunnel joints.This settlement is closely linked to factors such as river siltation,erosion,and foundation cushion loosening during operation.(2)The floor grouting method is more convenient,has minimal environmental impact,and effectively controls uneven settlement at a lower cost.(3)The W-steel plate reinforcement method significantly improves the shear strength of the middle partition wall′s concrete shear bond and is relatively simple to implement.Based on these findings,W-steel plate reinforcement and floor grouting are recommended for this case.

关 键 词：沉管隧道 病害 底板注浆 剪力键 W型钢板加固 

分 类 号：U45[建筑科学—桥梁与隧道工程]