ABSTRACT
Behavior of single and twin tunnels interacted with surrounding alluvial soils has been investigated. 4 different real sites has been selected with real geotechnical and seismic down hole test results, in order to model the real condition of surrounding soils. The results show the significant effect of shear wave velocity and tunnel depth on the lining moment, axial forces and settlements. Also, it has been concluded that the values of lining forces and moments of twin tunnel, has been strongly dependent on the tunnels distance and also the type of loading (static or dynamic), where the trend of their variation is also dependent on the soil properties considerably.
