Numerical investigation of the interaction between existing tunnels and driven pile installation
Numerical investigation of the interaction between existing tunnels and driven pile installation
The advancement of urbanisation in large cities yields an increased use of piles to support high-rise buildings and critical infrastructure. Compared to bored piles, the impact on existing buried assets and infrastructure including tunnels is often more pronounced for driven pile construction. However, the evolution of the deformation of segmental lined tunnels, which affects the operation and safety of tunnel, during pile installation, has not received significant attention. This study investigated tunnel deformation during pile installation using finite element analysis adopting the Arbitrary Lagrangian Eulerian (ALE) method, which was validated against published data. Three cases with a circular pile of 0.6 m in diameter and 20 m in length near a concrete-continuous-lined tunnel with a diameter of 6 m and a burial depth of 12 m in sandy ground were studied. In these cases, the tunnel cross-section changes from circular to vertical oval with the horizontal contraction being around 0.02% - 0.03% D with D being the tunnel's outer diameter. The results showed that the deformation varies approximately linearly with respect to the distance between the tunnel and the pile. Additionally, the centre of the tunnel moves away horizontally while it settles first and then uplifts vertically at a certain pile insertion depth. The section begins to heave at a smaller pile insertion depth when the clearance between pile and tunnel is larger. The results showed that the simulation method can accurately capture the behaviour of the tunnel during the pile installation. The results provide more insight with respect to pile design when the pile installation occurs in the vicinity of a tunnel.
L. Hai; P. Yensri; Asaad Faramarzi; N. Metje
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
C - Risk analysis and safety evaluation
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