盾构隧道下穿既有隧道施工影响的三维数值模拟

摘要

Undererossing construction of metro tunnels is one of the hot issues in the underground engineering field The urban tunnel construction will cause the deformation or even damage of the existing tunnel and other types of structures. The authors use 3D-FEM method to analyze an undercrossing tunnel in Guangzhou metro and study how the process of undercrossing construction is simulated and the influence of shield tunneling on displacement of the existing tunnel. The results show that the uneven settlement and lateral displacement both are normal distribution. On this basis, corresponding measures are su ggest appear in th ed to control e existing tunnel, and they e settlement effectively.%地铁隧道的交叉穿越是地下工程领域前沿研究课题之一。隧道开挖施工引起地层位移进而会引起附近既有隧道或其他各类结构的变形，甚至造成灾害。结合广州地铁交叉隧道工程实例，利用三维有限元方法对新建隧道盾构施工进行建模分析，研究了交叉隧道盾构施工对既有隧道位移的影响。结果表明，由于既有隧道的存在，新建隧道盾构施工引起既有隧道产生不均匀沉降和水平位移，分布曲线均符合正态分布。