Abstract
Day by day the call to solve traffic congestion problems is increasing. Subway tunnels and high-speed railway are commonly used for transportation. Therefore, tunnel construction induces soil movement, which in turn affects the stability and integrity of adjacent existing buildings. A series of numerical simulations have been established to investigate the effects of tunnel construction of the Greater Cairo Metro–Line 3-Phase-1 on adjacent pile cap foundations of Garage El-Attaba building. Many parameters have been investigated such as tunnel diameter and the distance between pile and tunnel at different tunnel axis and deep and shallow tunnel. After thorough analysis of the results’ simulation, it was found that the tunneling induces additional axial forces and bending moment as well as increasing axial settlement and lateral deflection. Moreover, the results obtained from the parametric study for the shallow and deep tunnel show that the tunnel depth has a much significant effect on piles responses. Finally, the tunnel diameter has an impact on pile responses as well as the pile cap foundation influenced by the tunnel when the tunnel is in very close vicinity of the pile, and its effect is modest to negligible if located far away from the buildings.
Highlights
Due to the stress release caused by the tunnel construction, the pile settlement becomes larger than before tunneling
It can be seen that an increase in the diameter of the tunnel causes an increase in bending moment [52]
NX software to study the behavior of cap pilefoundation cap foundation for Garage
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. According to the full 3D FEM, modeling analysis conducted by [30] carried out a 3D finite element model to study the effects of tunneling on the adjacent piled structures using modified Mohr–Coulomb. The results showed that the shear stress of the upper part of the pile is large, while the bottom is small in the tunneling process It was determined, relating to the pile position, that the majority of the axial force on the pile was evolving within ±2 times the diameter of the tunnel behind and ahead of the piles. Jongpradist et al [18] numerically conducted a three-dimensional simulation to investigate the effects of tunneling on adjacent pile foundations. The main purpose of the present study is to investigate the influence of tunneling progress (remove of soil elements and install of the lining) adjacent to existing pile cap foundations.
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