Based on effective stress analysis method, the main tunnel, connected aisle and formation interaction three-dimensional calculation model was proposed by finite difference program FLAC3D. On condition of single-time intersection of two trains, pore water pressure, deformation and principle stress of the typical section characteristic points of junction between the connected aisle and tunnel was emphatically analyzed. The results show that: under train vibration load, the closer the soil layer from the arch bottom, the larger the PPR, but all are smaller than 1, which still cannot reach the condition of liquefaction; the maximum displacement of lining appears at the arch bottom, of which the value is 0.16 mm; the maximum tension-compression stress of lining are all smaller than its design value of corresponding strength, which shows that the lining is safe under train vibration load.