考虑接头力学特性的盾构隧道衬砌结构计算方法研究

mechanical characteristics of joints Calculation method of shield tunnel lining considering

基于盾构隧道衬砌结构接头的构造特征,建立了接头的力学模型,将接头位置管片间的相互作用离散为一系列由剪切弹簧和法向弹簧组成的组合弹簧,根据得到的节点弹簧应力或法向位移在计算过程中动态调整弹簧刚度参数,将接头模型应用到衬砌结构计算中。该方法可以综合考虑衬砌结构的横向和纵向结构性能,计算管片和接头的内力与变形以及接缝的张开量。采用上海长江隧道衬砌结构整环试验结果对计算模型进行了验证,结果表明该模型能比较合理地模拟衬砌结构的变形特性。

Based on structural characteristics of lining joints of shield tunnel,a mechanical model of joint was established.The interaction between segments is transformed into a series of combined shearing and normal springs.The model was then implemented into FLAC3D code and the spring stiffness could be adjusted automatically under diverse deformation styles of lining joints during processing.Both the transverse and longitudinal structural behavior could be simulated in terms of the internal forces and deformation of shield tunnel.Finally,the model was validated by a whole ring test on Shanghai Yangtze River Tunnel lining.A good agreement between tested and calculated results was obtained to verify rationality of the algorithm.