Research methods: Load release factor and equivalent longitude stiffness factor are introduced with the object of Youjiazhuang to Nankangcun subway section in the Xi' an metro line-2. Paper adopted 3 D FEM in the research of ground sectional groove and longitude settlement curve distribution，varying laws conducted by parallel shield tunnel construction are also included.
Research results: Infections of diversities as surrounding soil condition，tunnel covering thickness，advance force and tunnel clear distance，etc on the ground movement value are also probed in this paper，void variations of ground settlement and up-heal during tunnel construction are also discovered by 3 D curves.
Research conclusions: The surrounding soil condition illness，tunnel covering depth lessen，advance force increscent and clear distance shortness could also result in ground movement enhancement induced by sectional parallel shield tunnel construction. Advises as advance force adjustment and clear distance increscent during parallel shield tunnel construction for the reduction of ground environment influences are also suggested in this paper.
2007, Vol. 24 
