沉管隧道管节接头混凝土剪力键压剪破坏试验研究  

EXPERIMENTAL FAILURE ANALYSIS ON CONCRETE SHEAR KEYS IN IMMERSION JOINT SUBJECTED TO COMPRESSION-SHEAR LOADING

作　　者：袁勇[1] 禹海涛[2] 萧文浩 徐国平[4] 蒋至彦 YUAN Yong YU Hai-tao XIAO Wen-hao XU Guo-ping JIANG Zhi-yan(State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China Key Laboratory of Geotechnical and Underground Engineering （Tongji University） of Ministry of Education, Shanghai 200092, China Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China CCCC Highway Consultants Co., Ltd., Beijing 100088, China)

机构地区：[1]同济大学土木工程国家重点实验室,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]同济大学地下建筑与工程系,上海200092 [4]中交公路规划设计院有限公司,北京100088

出　　处：《工程力学》2017年第3期149-154,181,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51208296;51478343);上海市科学技术委员会项目(13231200503);"十一五"国家科技支撑计划项目(2011BAG07B01)

摘　　要：接头是沉管隧道中最薄弱的一环,在受到地震和不均匀沉降等作用下,接头会发生横向变形,并通过接头中的剪力键传递。目前,国内外沉管隧道管节接头变形规律的研究较少集中在剪力键上,更缺少管节接头整体力学性能试验数据的支持。根据沉管隧道接头构造设计特点,该文提出了一套测试接头压剪承载力和破坏模式的破坏试验方法和加载方案,并开展了几何比尺为1∶10的管节接头压剪试验,研究接头在低周往复剪切荷载下的力学性能,记录其荷载-位移曲线,最终获得接头压剪刚度曲线。试验结果表明,管节接头和单个剪力键的承载力分别是310 k N/355 k N(正/负向)和88 k N,均比设计承载力高。而接头剪力键的破坏模式主要表现为局部翘曲破坏和凸榫根部拉裂破坏。When the immersed tunnel is subjected to earthquakes, differential settlement or/and other loadings, transversal deformation occurs and is transferred by the shear keys in the immersion joint, which is deemed to be the weakest part in immersed tunnel. So far, in consideration of researches on immersion joint, only few of them focus on shear keys and most of them are lack of support from the experiments on the behavior of the whole immersion joint. Based on the characteristics of the immersion joint, a testing method and a loading scheme are proposed to obtain the shear capacity and failure mode of the joint. With the geometric scale of 1：10, the model was designed and the compression-shear test was carried out to investigate the mechanical behavior of the joint subjected to low frequency cyclic loading. The load-displacement curves of the joint and the shear stiffness are recorded. The results indicate that the shear capacities of the joint and one single shear key are 3 10 kN/355 kN （＋/-）and 88 kN respectively, which are both higher than the designed values. The local warping failure and tension failure in the root of tenon are regarded as the failure mode of the concrete shear keys.

关 键 词：沉管隧道接头 混凝土剪力键 结构试验 低周往复 剪切破坏 

分 类 号：U459.5[建筑科学—桥梁与隧道工程]