Nowadays with great development in human societies and complexity in urban transportations and the necessity to have under-ground places, designing tunnels is one of the main challenges for geotechnic engineers. Tunnel in urban transportation are one of the main strategies to remove traffics and using urban places properly, that if don’t have safety may cause irreparable dangers. The most important factor in designing tunnels or any other under-ground places is stability. In may grounds excavation tunnels don’t have necessary stability and to be firm, some guards should be used. In this research instructing tunnels in saturate soil environments has been studied and to have necessary stability in these excavations diaphragm walls have been used. By increasing the load, the amount of displacement in diaphragm walls increases and appointing this displacement in designing is very important. Considering the displacement in diaphragm walls due to the amount of loads in tunnels with three layers (clay, sand, fine-grained soil) have been studied. To show interaction between tunnel and wall, wall with height about 18,15,12,10 meter and thickness 1 meter and one pace excavation with one meter depth could be used. The result of considering and studding of diaphragm walls show that by increasing the load, displacements of the whole diaphragm walls before and after excavation of tunnel due to the diameter of tunnel, at first increase them decrease.
