The Π-Formed Diaphragm Wall Construction for Departure and Reception of Shield Machine

In the design of shield tunnels, it is important to determine structure diaphragm wall in order achieve required retaining pattern. this paper, stabilization effect a new (Π-formed wall) investigated based on model experiments and numerical simulations. By varying length wing its angle end wall, possible discuss different styles Π-formed support soil behind during departure reception machine, internal force distribution generated excavation, excavation machine ground settlement construction stages. walls can effectively reduce major principal stresses excavation. The maximum value stress increases with damage concrete tends occur outside rim wall.