Because of the effect of higher modes of surface waves and the distance between two receivers,it is very difficult to calculate absolute phase differences from the wrapped phase curve given in frequency domain by the conventional unwrapped technique.

This paper builts general mathematic model for calculating the space tunnel distance with coordinate transformation and applies this model to two space tunnels of No.

Therefore,the fixed safe space for lane-changing in some cellular automaton (CA) models is not appropriate.

In order to investigate the influence of different lateral-stress coefficient and tunnel clear distance on two tunnels mutually when they were excavated non-synchronously, a series of calculations and analyses are carried out by using the analysis of FEM.