南京夹江隧道不同变形模式下结构受力特性分析与控制标准探讨  

Structural Mechanical Behaviors Analysis and Control Standards of Nanjing Jiajiang Tunnel under Different Deformation Modes

作　　者：章登精 龚彦峰[2,3] 古常友 樊思成 薛光桥 桑运龙[4,5] ZHANG Dengjing;GONG Yanfeng;GU Changyou;FAN Sicheng;XUE Guangqiao;SANG Yunlong(Nanjing Public Engineering Construction Center,Nanjing 210019;China Railway No.4 Survey and Design Institute Group Co.,Ltd.,Wuhan 430063;Hubei Engineering Laboratory of Underwater Tunneling Technology,Wuhan 430063;Shanghai Tongyan Civil Engineering Technology Co.,Ltd.,Shanghai 200092;Shanghai Underground Infrastructure Safety Testing and Maintenance Equipment Engineering Technology Research Center,Shanghai 200092)

机构地区：[1]南京市公共工程建设中心,南京210019 [2]中铁第四勘察设计院集团有限公司,武汉430063 [3]水下隧道技术湖北省工程实验室,武汉430063 [4]上海同岩土木工程科技股份有限公司,上海200092 [5]上海地下基础设施安全检测与养护装备工程技术研究中心,上海200092

出　　处：《现代隧道技术》2020年第S01期359-366,共8页Modern Tunnelling Technology

基　　金：国家自然基金面上项目(51878497);铁四院科技研究开发计划(2018K121).

摘　　要：针对长江中下游流域大直径盾构隧道快速增加、运营安全控制标准不断增高的现状,依托南京五桥夹江隧道,通过三维数值仿真的手段研究了不同变形模式下典型地质区段管片结构的受力特性,并建立了隧道收敛变形与结构承载、防水性能的对应关系,提出不同模式下隧道收敛变形的控制标准。得到的有益结论主要有:(1)“横鸭蛋”变形模式下,结构依次发生混凝土屈服、螺栓屈服、钢筋屈服、接缝张开达8 mm;“竖鸭蛋”变形模式下,结构依次发生混凝土屈服、钢筋屈服、螺栓屈服。(2)可将隧道直径变形比(收敛)作为结构运营安全的控制指标,“横鸭蛋”变形模式下直径变形比不应超过7‰D,而“竖鸭蛋”变形模式下直径变形比则应不应超过3‰D。In view of rapid increase of the large diameter shield tunnel around middle and lower basin of the Yangtze river and higher standard of operational safety requirement,the stress behaviors of segment structure under different deformation modes of typical geological section are studied by means of 3D numerical simulation relying on the Jiajiang tunnel of Nanjing fifth bridge project.The corresponding relationship between the tunnel convergence and structural bearing,waterproof performance is set up.The tunnel convergence control standards under different modes are proposed.The beneficial conclusions are as follows:(1)under the deformation mode of“horizontal duck egg”,concrete yielding,bolt yielding,steel yielding and joint extension reaching 8 mm occurr successively in the structure;under the deformation mode of“vertical duck egg”,concrete yielding,steel yielding and bolt yielding occurr successively in the structure;(2)the tunnel diameter deformation ratio(convergence)could be taken as the control index for the safety of structure operation.Under the deformation mode of“horizontal duck egg”,the diameter deformation ratio should not exceed 7‰D,while under the deformation mode of“vertical duck egg”,the diameter deformation ratio should not exceed 3‰D.

关 键 词：大直径盾构隧道 结构受力特性 变形模式 运营安全 直径变形比 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]