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通过室内离心模型试验模拟双孔盾构隧道近接施工,研究了衬砌结构横向内力的量值、分布规律以及随盾构推进距离和两隧道相对位置的变化规律。结果表明,衬砌结构拱顶和拱底内侧受拉,左右拱腰外侧受拉,拱底出现最大弯矩;整个结构均受压,拱顶和拱底处轴力较小,左右拱腰轴力较大;既有隧道施工完成后,结构内力基本呈对称分布,且随着新建隧道的施工,两隧道结构内力将随其相对位置的变化而变化;新建隧道施工对既有隧道结构内力影响明显,设计施工时应采取相应的加强措施。
The indoor centrifugal model test is used to simulate the construction of double-shield tunnel. The magnitude and distribution of transverse internal force of lining structure and the variation of shield tunneling distance and the relative position of two tunnels are studied. The results show that the inner side of the dome and the bottom of the lining structure are tensioned and the outer sides of the arch waist are tensioned and the maximum bending moment occurs on the arch bottom. The whole structure is under compression and the axial force at the dome and the arch bottom is small. And the internal forces of the two tunnels will change with their relative positions with the construction of the new tunnel; the effect of the new tunnel construction on the internal force of the existing tunnel structure is obvious , Design and construction should take the appropriate measures to strengthen.