Comparative Study of Single and Group of Bored Pile under Axial Loading in Cohesion Less, Cohesive and Layered Soil

Abstract

Determining the bearing capacity of a pile is a complex geotechnical task crucial for supporting structures. Piles serve to transmit loads to deeper soil layers. This study investigates piles' bearing capacity and behavior in various soil types in single and group configurations, including cohesionless, cohesive, and layered soils. Piles are arranged in a 2x2 configuration, with a length-to-diameter ratio of 20.00 and precise spacing three times the diameter, subjected to vertical axial loads. Using a bored pile model of specific dimensions, GEO5 Software analyzes friction distribution along the pile shaft, load transfer at the pile tip, and group effects of four piles. The research compares theoretical methods with GEO5 results for bearing capacity estimation. Findings show similarities between NAVFAC DM 7.2 and manual calculations for single piles, while the CTE-DB SE-C method yields different results. Single pile bearing capacity is lower in layered soil than other types, and group bearing capacity exceeds that of single piles regardless of soil conditions.