This paper using 3D FFM to study the soil displacements, the surface settlements and the influence on the nearly spaced tunnel during shield tunneling.A number of useful conclusions have been gained.

• 本文运用三维有限元法对盾构法施工过程中引起的地层位移和地面沉降规律以及对临近已建隧道的影响进行了全面的研究，得到了一些有意义的结论。