الفهرس 
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Abstract
The construction of piled-foundation structure or bridges involves the potential for ground
movement caused by pile vertical and lateral loading to affect existing tunnel. Numerical
methods are increasingly used in such a problem. The objective of this thesis is to propose a
finite element model to simulate Pile-Tunnel interaction and predict pile loading, vertically and
laterally, impact on a nearby existing tunnel.
Firstly, a three-dimensional finite element model was created using PLAXIS 3D software to
simulate tunnel construction procedure. Back analysis of greenfield tunneling case study
showed excellent agreement between predicted and field monitored surface settlement. The
applicability of the proposed model to Tunnel-Structure interaction analysis was proved by
back analysis of building response to tunneling case study.
Moreover, pile modeling methods were assessed, and the proposed finite element model was
developed to simulate Pile-Tunnel interaction problems. Tunnel construction was simulated
under existing group of piles, the results showed that the presented model accurately simulate
pile response to tunneling.
The validated model was used to perform a set of parametric study to assess the impact of pile
loading on an existing tunnel. The results of parametric studies show that pile loading increase
bending moment, axial compression force and induce new tension force on tunnel lining with
different percentage depending on Pile-Tunnel configuration. An influence zone of Loaded pile
effect on existing tunnel is identified by clearance of 2𝑫𝑻 and 𝑯𝑻 /𝑳𝑷 ratio of 1.25. However,
lateral load effect is more significant through a clearance of 𝑫𝑻 and 𝑯𝑻 /𝑳𝑷 ratio of 0.50.
Lateral load on pile contributes by 50.00% of induced B.M, 10.00% of induced compression
axial force, 2.00% of induced tension axial force on tunnel lining and 95.00% of lateral
deformation. On the other hand, pile axial load causes about 87.00% of induced vertical
deformation of tunnel lining.