ABSTRACT
Development projects often face challenges when deep excavations are conducted near existing pile-supported structures. Without precise analysis, interactions between excavations and adjacent foundations may lead to structural damage or collapse. This study uses advanced numerical techniques, specifically finite element modelling in PLAXIS 3D, to evaluate these interactions under realistic ground and load conditions. The Mohr-Coulomb (MC) constitutive model is adopted to simulate soft clay soil behavior, emphasizing deformation and stress redistribution in both soil and piles due to nearby excavation. Results indicate that pile settlement and bending moments increase notably when excavation occurs within 5 m of the pile cap, with peak horizontal and vertical displacements occurring at an excavation depth of 12 m. When the excavation depth exceeds 8 m, the influence on pile behavior diminishes, suggesting a safe clearance zone due to stress dissipation and soil arching. These findings provide valuable insights for safer design and planning in urban construction environments.
