盾构掘进对既有桩基影响的数值模拟

为研究盾构施工对桥梁桩基的影响，基于ANSYS软件，建立了盾构近距离穿越既有桥梁桩基的三维有限元模型。数值模拟结果表明，盾构施工会引起地层产生较为明显的位移，根据与隧道相对深度的不同，竖向位移可分为沉降与回弹；隧道周围土体有向隧道变形的趋势，使得桩体产生垂直于隧道的水平位移；开挖面支护压力对桩体平行于隧道方向的位移产生主导影响，施工中取稍大于静止土压力的支护压力是比较适合的。

Numerical Analysis on Influence of Shield Tunneling to Neighboring Piles

To study the influences of shield tunneling to neighboring piles,three dimensional finite element models is established based on ANSYS.It is revealed that shield tunneling can cause displacement of around strata.The vertical displacement can be classified into settlement or rebound according to the relative depth to the tunnel.The strata around the tunnel have a displacement tend toward the tunnel;it will cause the horizontal displacement of the piles,which is perpendicular to the tunnel.The pressure on the...