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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。
In view of the fact that there is no existing analytic formula or chart to follow and the experimental data support problem is not satisfied at present, the relative rigidity ratio between immersed tunnel joint and body joint body is not enough. According to structural design feature of tube body and joint, The mechanical performance test of immersed tunnel pipe joints with geometrical scale of 1:10 is carried out. By applying different loads on the joints of pipe joints, the curves of compression amount, joint moment and rotation angle under different axial pressures are obtained respectively. Curve and shear-shear displacement curve. The stiffness ratio curve of the joint between the pipe joint and the pipe under axial compression, bending load and shear load was calculated. The above three stiffness ratio curves were fitted The relationship between stiffness ratio and axial pressure of joint is discussed. The experimental results show that the axial stiffness ratio of pipe joints under loading and unloading conditions is not the same, and the axial stiffness ratio of unloading is larger than that of unloading axial load, but basically both show a linear trend. With the axial pressure The bending rigidity ratio and the shear stiffness ratio of the pipe joint and the pipe body also all increased linearly. In the hydraulic pressure range of the pipe joint of the immersed pipe tunnel (corresponding to the axial pressure of 440-1 760kN) The range of axial stiffness and unloading stiffness are 1/360 ~ 1/120 and 1/1 028 ~ 1/305 respectively, and the range of bending stiffness ratio is 1/1 161 ~ 1/25, while the shear stiffness ratio The variation range is 1/76 ~ 1/24. Compared with the ratio of axial and flexural rigidity, the shear stiffness of immersed tunnel joints and pipe joints is relatively large, and its sensitivity to axial pressure changes is relatively small.