The numerical analysis is carried out to study the influence adjacent sheild tunnel construction on light-railway line 1 in Suzhou on the single pile with variable stiffness

The results of numerical simulationing show that the pile move toward the tunnel

the lateral deformation of the pile is greatest in the tunnel center.The pile lateral and vertical deformation becomes smaller with the pile stiffness increasing.Pile axial force and bending moment becomes greater with the increasing of the pile stiffness

the pile greatest negative bending moment is at the tunnel axis.When shield driving is below the pile

the deformation along tunnel axis is approximately a line.When pile elastic modulus is 0.5 GPa

the vertical deformation difference between pile top and bottom is greater;when pile elastic modulus is greater than 0.5 GPa the vertical deformation increases quickly.The pile axial force is great at pile top and bottom

but small at the middle. Pile bending moment becomes greater with pile stiffness increasing.