双线隧道盾构施工对邻近桩基影响的数值分析

Numerical analysis on influence of double-line shield construction on neighboring piies

文章利用MIDAS/GTS软件,对合肥地铁1号线双线盾构隧道穿越邻近建筑物桩基进行了数值模拟,分析了不同开挖顺序情况下桩基的变形特征。结果表明:当按顺序对双线隧道进行开挖时,位于后开挖隧道侧的桩基变形和内力比先开挖隧道侧略大。除此之外,不同的隧道开挖顺序引起的桩基水平位移、竖向位移、轴力以及弯矩的差别不大。

By using the finite element software MIDAS/GTS to conduct a numerical simulation of doub-le-line shield tunnel crossing neighboring pile of Hefei,an analysis of the deformation characteristics of pile in different tunnel excavation sequence was analyzed in this study. Results show tformation and stress of piles in the right side of the tunnel were larger than those of lett side of thetunnel when the double line tunnel excavation sequence is first lett and then right. When the tunnel ex-cavation sequence is first right, the horizontal displacement is larger. In addition, the horizontal dis-placement, vertical displacement, axial force and bending moment of the pile cvation sequence are not very large.