中文摘要：

针对目前沉管隧道接头与管节本体相对刚度比取值既无现成的解析公式或图表可循,也无试验数据支持问题,根据沉管隧道管体及管节接头的结构构造设计特点,设计了几何比尺为1∶10的沉管隧道管节接头力学性能试验,通过对管节接头施加不同的荷载,分别得到了管节接头在不同轴向压力下的压缩量曲线、弯矩-转角曲线和剪力-剪切位移曲线;通过计算得到了管节接头与管体在受轴向压力、弯曲荷载和剪切荷载下的刚度比曲线;分别对上述3种刚度比曲线进行了拟合分析,并对刚度比随着接头轴向压力变化的规律进行了讨论。试验结果表明：管节接头在加载和卸载条件下的轴向刚度比并不相同,而且加载轴向刚度比较卸载轴向刚度比大,但是基本上两者均呈线性趋势;随着轴向压力的增大,管节接头与管体的弯曲刚度比和剪切刚度比也均呈线性增加趋势;在沉管隧道管节接头工作水压区间内（对应轴向压力为440-1 760kN）,轴向加、卸载刚度比的变化范围分别为1/360-1/120和1/1 028-1/305,弯曲刚度比的变化范围为1/1 161-1/25,而剪切刚度比的变化范围则为1/76-1/24。相比轴向和弯曲刚度比,沉管隧道接头与管节的剪切刚度比较大,而且其随轴向压力变化的敏感度相对较小。

英文摘要：

Aimed at the problems in taking the value of relative stiffness ratio of the immersion joint to the immersed tunnel element,which is neither formulated analytical solutions,graphs nor experimental data are available,based on the configuration characteristics of the immersion joint and the tunnel element,an experiment on the mechanical behavior of the immersion joint with geometry of 1∶10 was designed.The compression curve,moment-rotation curves and shearforce-shear displacement curves of the joint subjected to different levels of axial force were obtained as well as stiffness ratio curves of the immersion joint to the tunnel element under the axial,flexural and shear loads in the joint.The fitting curves for the three types of stiffness ratio curves were obtained and analyzed respectively.The relationships between the stiffness ratios and the axial force were discussed.The results show that,the axial stiffness ratios under the loading and unloading condition are not similar,the axial loading stiffness ratio is larger than the axial unloading one and both of them show a linear increasing trend;with the increase of the axial force,both the flexural and the shear stiffness ratios also experience a linear increasing trend.In the service hydraulic pressure range of the joint（corresponding to the axial force from 440to1 760kN）,the ranges of the axial loading,axial unloading,flexural and shear stiffness ratio are1/360 to 1/120,1/1 028 to 1/305,1/1 161 to 1/25,and 1/76 to 1/24 respectively.Compared to axial and flexural stiffness ratios of immersion joint to immersed tunnel element,shear ratio is relatively large and less sensitive to the change of the axial force.