Numerical Analysis on Interaction of Single Pile Tunnel System

In past few years, the number of tunnels construction in several populous cities significantly increases for better infrastructure development. In many situations, tunnel alignment must be laid below the high rise buildings, bridges or important civil engineering structures. In such condition, the chances of possible damage to the foundations of these structures are very high. Hence, it is vital to study the tunnel-pile interaction behaviour for the safety and serviceability of the both tunnel and the foundation of the existing structures. In view of this series of numerical analysis are carried out on tunnel-pile interaction behaviour. It is observed that the maximum surface settlement takes place at the centre of tunnel and it decreases with horizontal distance from tunnel centre at Greenfield condition. In tunnel pile condition, different pile behaviour is observed for varying tunnel position with respect to pile. Maximum pile head settlement is found when tunnel is placed just beneath the pile toe position. Reduction in pile capacity is found to be 3.07% and 6.98% when tunnel is placed near the centre of pile length and near the pile toe consequently. This is because of maximum end bearing resistance reduced when tunnel was placed near the pile toe.