Critical Aspect for Lateral Performance of Pile Adjacent to Deep Excavation and in Situ observation

Volume Title: ICASGE2025

Paper ID : 1150-ICASGE-FULL

Department of Civil Engineering, Faculty of Engineering, Pharos University in Alexandria, Egypt

Excavations for cut off and basement construction cause lateral effects on cast-in-place auger supported pile (CIASP). Calculating the excavation induced lateral deformations and bending moments on adjacent existing supporting piles are important to ensure the stability of pile during excavation specially in soft soil up to foundation basement level. This study attempts to investigate the observation lateral performance of working support piles (CIASP) due to excavation to foundation level and basement. In study sites it was observed sliding excavation slope and soil block movement caused failure in many cast-in-place auger supported pile (CIASP), where excavation-induced deformations are a two-way effect. The study attempts to assess deformation of a single and group pile, (CIASP) subjected to lateral ground movements induced by excavation and dewatering. The ground movements are analyzed using the finite element method by PLAXS 2D, per construction phase. Some precautions should be considered with inclined surface excavate between existing supporting pile (CIASP), and field observations are essential during excavation in site to avoid failure. The maximum bending moment, shear force and pile deflection development by soft soil movement are evaluated and pile response profile is asses. A parametric study carried out to investigate the excavation induced existing supporting pile (CIASP) behavior varying with the depth of the excavation, soil properties, pile location with respect to the excavation and retained wall support system, or excavation slops. evaluated

Excavation; ground movements; Soil Stiffness; Lateral load; slope stability behavior; Finite element analyses

Geotechnical Engineering (GEO)