Finite element analysis of the twin tunnels-piled structure interaction

for underground construction. In most cases, each tunnel line
usually builds two parallel tunnels to facilitate efficient traffic
management. The ground deformation mechanisms during the
excavation of twin tunnels differ from that which occurs during the
construction of a single tunnel. The construction of two tunnels in
the urban area causes ground displacements and stress
redistribution, which pose a mechanical impact on the adjacent pile
foundations and underground structures. Therefore, optimization in
tunnel design requires predicting the response of pile structures and
adjacent underground infrasturcture. The present study delves into
the interaction analysis between the twin tunnels and the piled
structure through the use of the finite element method. The analysis
concentrates on aspects such as surface settlements, the response of
tunnel linings and the behavior of piles resulting from the
interaction between twin tunnels and deep foundations. The
obtained results indicate that the magnitude of the internal forces
and displacements of the front pile P1 closer to twin tunnels is
higher than for the rear piles P2, P3 and P4. The magnitude of the
internal forces and displacements of the piles for the case of twin
tunnels T1 and T2 construction are greater than that for the case of
single tunnel T1. The second tunnel T2 is located near the multistorey building, and it is strongly affected by twin tunnels-piled
structure interaction and therefore the magnitude of the normal
forces and bending moments of the tunnel lining for the case of
construction twin tunnels T1, T2 beneath piled-structure are greater
than that for case of twin tunnels T1, T2.