考虑横向与纵向刚度相似的模型盾构隧道设计方法

Design method for shield tunnel model considering similarities of transverse and longitudinal rigidities

由于盾构隧道的横向刚度有效率与纵向刚度有效率不一致,在模型试验中难以设计出横向刚度与纵向刚度均可满足相似要求的模型盾构隧道。根据模型试验相似设计理论,提出了一种横向刚度与纵向刚度均可满足相似要求的模型盾构隧道设计方法,即模型盾构隧道管片环采用修正匀质圆环模型,以横向刚度满足相似要求进行设计,提出了模型盾构隧道管片环设计计算方法,并采用对压法对模型盾构隧道管片环的横向刚度进行了测定;管片环之间采用垫有弹簧的螺栓连接,提出了相应的模型盾构隧道纵向刚度计算方法,并通过简支梁法对模型盾构隧道的纵向刚度进行了测定,对模型盾构隧道纵向刚度计算方法进行了验证。最后根据模型盾构隧道与原型盾构隧道纵向抗弯刚度相似关系,得到了垫在模型盾构隧道环缝连接螺栓上的弹簧刚度计算方法。

In view of the inconsistency of efficiencies of transverse and longitudinal rigidities of shield tunnels,it is difficult to design a shield tunnel model with similar transverse and longitudinal rigidities in model tests.According to the similarity design theories of model tests,the design method for the shield tunnel model with the transverse rigiditie and longitudinal rigidities both meeting the similarity requirements is proposed.The segment ring of the shield tunnel model is designed using a modified homogeneous ring model with the transverse rigidity meeting the similar requirements.The transverse rigidity of the segment ring is measured by using the symmetry pressure method.The method for the longitudinal rigidity of the shield tunnel model is proposed by using the bolt connection with spring between segment rings.The longitudinal rigidity is measured by using the simply supported beam method,and the theoretical method for the longitudinal rigidity of the shield tunnel model is verified.According to the similar relationship between the longitudinal rigidities of the model and prototype shield tunnels,the method for calculating the stiffness of spring installed on the circular joint connection bolt of the shield tunnel model is obtained.