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在隧道等效连续化模型基础上,认为环缝影响范围有限,尚未达到整环管片,对隧道纵向等效连续化模型进行深化。考虑环缝的影响范围,根据在轴力和弯矩作用下,等效连续梁模型的轴线变形与相同荷载作用下隧道的轴线变形一致的原则,并且引入横向接头影响系数和土层约束系数,得到隧道“等效弯曲刚度”的计算公式。最后,以上海地铁一号线隧道的几何数据和力学参数为基础,分别探讨了隧道结构本身各主要参数变化对其纵向刚度的影响,通过对计算结果的分析,可以增强对盾构法隧道纵向性能的认识。
Based on the tunnel equivalent continuum model, it is considered that the influence of the girth is limited and has not yet reached the whole ring segment, and the tunnel longitudinal equivalent continuum model is deepened. Considering the influence range of girth, according to the principle that the axis deformation of the equivalent continuous beam model is consistent with the axial deformation of the tunnel under the same load under the action of axial force and bending moment, the influence coefficient of lateral joint and the constraint coefficient of soil layer are introduced, Get the tunnel “equivalent bending stiffness ” formula. Finally, based on the geometric data and mechanical parameters of Shanghai Metro Line 1 tunnel, the influence of the changes of the main parameters of the tunnel structure on the longitudinal stiffness of the tunnel is discussed respectively. By analyzing the calculation results, Performance understanding.