胶州湾第二海底隧道穿越活动断层抗错断结构方案研究  

Antidislocation Structure Design of Jiaozhou Bay Second Subsea Tunnel Crossing an Active Fault

作　　者：武哲书 孙文昊[1,2] 肖明清 管鸿浩[1,2] 陈立保 WU Zheshu;SUN Wenhao;XIAO Mingqing;GUAN Honghao;CHEN Libao(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,Hubei,China;National and Local Joint Engineering Research Center of Underwater Tunneling Technology,Wuhan 430063,Hubei,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]水下隧道技术国家地方联合工程研究中心,湖北武汉430063 [3]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《隧道建设（中英文）》2023年第5期826-836,共11页Tunnel Construction

基　　金：国家重点研发计划项目(2021YFB2600802);中国博士后科学基金资助(2021M693698);水沙科学与水利水电工程国家重点实验室开放研究基金(sklhse-2021-C-01)。

摘　　要：为保证海底隧道在断层错动作用下的结构安全,依托胶州湾第二海底隧道工程,对隧道穿越最大位错量为0.49 m的沧口断裂段落进行衬砌结构设计,提出扩大断面和多孔脆性材料填充2种方案。采用有限元数值模拟方法对2种方案衬砌结构的变形与受力特点进行分析,并综合对比2种方案的衬砌结构受力情况、扩挖量和施工难易度,最终推荐采用柔性连接结合多孔脆性材料填充的抗错断结构设计方案。该方案在减小开挖量、未明显增加施工难度的同时,克服了扩大断面方案二次衬砌在断层错动作用下易破坏的问题,可保证止水构造正常发挥作用,提升海底隧道衬砌结构在断层错动下的安全性。Based on the Jiaozhou Bay Second Subsea Tunnel project,an antidislocation structure of the tunnel crossing the Cangkou fault subject to a maximum dislocation of 0.49 m is designed.An optimal structure design is proposed considering the serious weakening of the waterproof performance induced by the failure of the tunnel lining.The characteristics of deformation and stresses of the secondary lining′s large cross-section scheme and the porous brittle buffer material scheme are compared using the finite element method.Furthermore,the excavation quantities and the construction difficulties are compared,and the optimal design scheme of an antidislocation structure with flexible joints and porous brittle material buffering is finally selected.In addition to reducing the amount of excavation work and eliminating construction difficulty,the optimal scheme addresses the issue of the secondary lining of the traditional expanded excavation method,which is prone to devastating damage under the action of fault dislocation.This ensures the normal functionality of the water stop structure,and improves the safety of the subsea tunnel under active fault dislocation.

关 键 词：海底隧道 活动断层 抗错断结构 柔性连接 多孔脆性填充材料 

分 类 号：U45[建筑科学—桥梁与隧道工程]