盾构输水隧道C-T快速连接件纵缝受弯特性试验研究  

Experimental Study on Flexural Characteristics of Longitudinal Joints with C-T Quick Connectors in Shield Water Conveyance Tunnel

作　　者：王健 熊碧露 吴昱东 WANG Jian;XIONG Bilu;WU Yudong(China Nuclear Power Design Company Ltd.,Shenzhen 518172,Guangdong,China;Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineer of Ministry of Education,Tongji University,Shanghai 200092,China)

机构地区：[1]深圳中广核工程设计有限公司,广东深圳518172 [2]同济大学土木工程学院地下建筑与工程系,上海200092 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《隧道建设（中英文）》2024年第S01期224-229,共6页Tunnel Construction

基　　金：国家自然科学基金(52090083,52378405)。

摘　　要：C-T快速连接件纵缝应用于盾构输水隧道时,隧道中的内水压使接缝处轴力减小,进而影响接缝的抗弯性能,但轴力变化对快速连接件纵缝抗弯性能的影响研究还不充分。因此,开展较小轴力正弯矩下C-T快速连接件接缝足尺压弯试验,并将试验结果与既有相同接缝的较大轴力工况试验对比,总结不同轴力下C-T件纵缝压弯力学特性。结果表明:1)较小轴力下,C-T件纵缝的受弯过程可以分为混凝土单独承弯阶段和混凝土连接件共同承弯阶段。单独承弯阶段弯矩首先呈线性增长,之后接缝抗弯刚度不断减小。当C-T件搭接时接缝抗弯刚度增大,之后连接件快速屈服,抗弯刚度不断降低直至连接件断裂接缝破坏。2)较小轴力下,影响接缝抗弯能力的主要因素为C-T件的搭接、屈服及断裂,需要提高C-T件的抗拉性能以防止其过早屈服;较大轴力下,外侧混凝土的搭接和压溃是影响接缝抗弯能力的主要因素点。在不同轴力下连接件周围均出现裂缝。When the longitudinal joints with C-T quick connectors are used in shield water conveyance tunnels,the internal water pressure in the tunnel decreases the axial force at the joints,which in turn affects the flexural performance of the joints.However,the axial force effect on the flexural performance of the joints with C-T quick connectors has not been adequately investigated.Therefore,a full-scale compression-bending experiment of C-T quick connector joints under a smaller axial force was carried out in this study.The experiment results were compared with those of the larger axial force experiment with the same joint,and the flexural characteristics of the joint with C-T connectors under different axial forces were summarized.The results show that:(1)Under smaller axial force,the flexural process of C-T connectors joints can be divided into concrete bending stage and concrete and connectors bending stage.In the concrete bending stage,the moment firstly increases linearly,and then the flexural stiffness of the joint decreases continuously.The flexural stiffness of the joint increases when the C-T connectors are lapped,after which the connectors yields rapidly and the flexural stiffness decreases until the joint failure.(2)Under smaller axial forces,the factors affecting the flexural capacity of the joints are lap,yield,and fracture of the C-T connectors;the tensile properties of C-T connectors need to be improved to prevent premature yielding;while under larger axial forces, the lap and crush of the outer concrete are the critical nodes in the flexural process of the joints. Cracks were observed around the connectors under different axial forces.

关 键 词：盾构隧道 快速连接件 轴力大小 纵缝受弯行为 足尺试验 

分 类 号：U45[建筑科学—桥梁与隧道工程]