正断层错动对海底盾构隧道管片及环缝接头影响分析  

Analysis of the Effect of Positive Fault Misalignment on Subsea Shield Tunnel Segment and Annular Joint

作　　者：孙文昊[1,2] 陈立保 李沛松[3] 王琦 张津 SUN Wenhao;CHEN Libao;LI Peisong;WANG Qi;ZHANG Jin(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;National Local Joint Engineering Research Center for Underwater Tunnel Technology,Wuhan 430063,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]水下隧道技术国家地方联合工程研究中心,武汉430063 [3]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2021年第10期87-92,共6页Railway Standard Design

基　　金：中铁第四勘察设计院集团有限公司科研课题(2019K037);国家自然科学基金项目(51878566)。

摘　　要：活动断层是海底隧道建设中经常遇到的不良地质条件,位于断层破碎带区域隧道会遭到不同程度的结构破坏。为探明断层错动对海底盾构隧道管片及环间接头受力的影响,依托青岛胶州湾第二海底隧道工程,建立穿越正断层盾构隧道三维数值模型,并设置不同接头螺栓(直螺栓、斜螺栓)及管片幅宽(1.5,1.8,2.0 m)共6种工况进行分析。结果表明:隧道弯矩、剪力在断层面附近出现极大值,而轴力则位于断层带中部;环间张开量均呈现三峰值特点,采用斜螺栓可有效抑制环间张开量;管片错台主要发生在断层面交界处,且集中在断层面两侧2.0 m范围内;采用小幅宽管片能有效减小环缝接头的变形和受力。Active faults are the adverse geological conditions frequently encountered in subsea tunnel construction,and tunnels located in the fault fragmentation zone area suffer different degrees of structural damage.In order to investigate the effect of fault misalignment on the segmen and ring head of subsea shield tunnel,a three-dimensional numerical model of shield tunnel through positive fault is established based on the second submarine tunnel project in Jiaozhou Bay,Qingdao,and six working conditions with different joint bolts(straight bolts,inclined bolts)and tube sheet widths(1.5 m,1.8 m and 2.0 m)are analyzed.The results show that the tunnel bending moment and shear force appear extremely near the fault surface,while the axial force is located in the middle of the fault zone.The inter-ring tensions all are characteristics of three peak values,and the use of inclined bolts can effectively suppress the inter-ring tensions.The segment misalignment mainly occurs at the junction of the fault surface and concentrates within 2.0 m on both sides of the fault surface.The use of small width segment can effectively reduce the deformation and force of the ring joint.

关 键 词：盾构隧道 海底隧道 正断层错动 接头螺栓 管片错台 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] U455.49[交通运输工程—道路与铁道工程]