Impact of Shield Tunneling on Adjacent Pile Foundation in Sandy Cobble Strata

Abstract

The assessment of the impact of urban area shield tunneling on adjacent pile foundations is essential to ensure the stability and integrity of the piled buildings. Sandy cobble strata has force transmission feature of strong dispersion; therefore the equilibrium state of original strata would be easily destroyed by shield tunneling. In this study, model tests referring to the Chengdu Metro Line 1 and using the Φ520 mm EPB model shield machine are carried out to investigate the impact of shield tunneling on the existing pile foundation deformation and internal forces. Meanwhile, particle distinct element method is applied to analyze the soil particle movement feature surrounding the pile foundation from the micro view. Results showed that soil disturbance surrounding the pile foundation caused by shield tunneling makes the ground surface subsidence and pile foundation tilt, leading to the occurrence of stress concentration at the pile foundation base and nearby regions. Cutter head positive resistance and friction effect between shield machine and surrounding strata lead to the pile foundation three-dimensional movement and deformation during the shield tunneling.

Ground Deformation of Shield Tunneling through Composite Strata in Coastal Areas

“…A multitude of researchers have employed the empirical formula method in their studies, notably including the mirror method, the stress function method in polar coordinates [12], the complex variable function method [13], the random medium theory [14], the energy conservation method, and the deformation prediction method grounded in Mindlin's basic solution [15]. Drawing upon similar theoretical frameworks, He et al [16] conducted indoor model tests to investigate the ground deformation settlement induced by tunnel excavation. He et al [17] employed field engineering data to analyze the disturbance patterns of adjacent strata using a force shield.…”

Calculation of surface settlement and pile foundation deformation caused by shield machine tunnelling along curve section

“…Franza et al (2017) present an elastic study of tunnel-pile-structure interaction through Winkler-based Two-Stage Analysis Methods (TSAMs), focussing on structural displacements resulting from tunnel excavation beneath piled frames or simple equivalent beams; Jongpradist et al (2013) investigate the influences of tunnel excavation on existing loaded piles by three-dimensional elastoplastic numerical analyses; Mroueh and Shahrour (2002) used an elastoplastic three-dimensional finite element modelling to analysis of the impact of the construction of urban tunnels on adjacent pile foundations. He et al (2013) used the 520 mm earth pressure balance (EPB) model shield machine to investigate the impact of shield tunnelling on the existing pile foundation deformation and internal forces; Min et al (2011) used a three-dimensional finite element simulation and centrifuge test to investigate the effects of tunnel construction on nearby pile foundation. Miao et al (2022) used a geotechnical centrifugal test to reveal the failure mode and deformation mechanism under the action of water level fluctuation and rainfall.…”

Cavity Expansion–Contraction-Based Method for Tunnel–Soil–Pile Interaction in a Unified Clay and Sand Model: Drained Analysis

“…In urban areas, pile foundations often support superstructures, and it is common for new tunnel construction to occur in the proximity of existing piles. The tunnel-soil-pile interaction problem therefore becomes an issue of concern for engineers tasked with avoiding tunneling induced damages (Loganathan et al, 2000;Marshall and Mair, 2011;He et al, 2013;Basile, 2014).…”