错缝拼装衬砌纵向螺栓剪切模型的研究

RESEARCH ON SHEAR MODEL OF RING JOINT BOLTS IN STAGGER-JOINTED SEGMENTAL LININGS

首先,建立三维有限元模型对盾构法隧道错缝拼装衬砌进行了分析;然后,在对三维有限元分析结果研究的基础上,建立了环缝处的纵向螺栓剪切模型,利用该模型可以计算得到错缝拼装衬砌二维梁-弹簧模型中环间剪切弹簧的刚度;最后,把此剪切模型应用到错缝衬砌的二维分析中,通过与三维计算结果的对比,认为螺栓剪切模型可以较好地模拟错缝隧道三维工作状态中纵向螺栓的剪切作用。

A 3D finite element structural model is built in this paper to study the load-bearing behavior of stagger-jointed segmental linings of shield-tunnel and to analyze shear force transference between adjacent segmental rings. Based on the 3D analysis result, shear models of ring joint bolt is built and shear parameters between rings needed in 2D analysis with beam-spring model can be obtained by this shear model. The results of 2D analysis of shield-tunnel segmental linings have a good agreement with those by 3D finite element model. It shows that the presented shear model is effective for stimulation of shear force transference between adjacent segmental rings.