Studying of the Behavior of Single Pile and Group Pile Under Static Laterally Load in Bangkok Subsoils with 3D Finite Element Method

Abstract

This article discusses the behavior of single piles and pile groups under static lateral loading in Bangkok subsoils. The objective is to investigate the behavior of piles subjected to large lateral loads, focusing on single piles and pile groups based on pile test data in Bangkok subsoils [1]. The study also aims to identify the appropriate stiffness parameters for the hardening soil model, referencing field test results. A 3D finite element method using PLAXIS 3D software. The findings reveal that the total stiffness equivalent to the effective stress stiffness of the soil in geotechnical engineering for engineering design of piles under service load conditions without failure is  in the range of 200 –300. Pile simulations using an elastoplastic model, incorporating the cracked-section moment of inertia and the ultimate bending moment, indicate that the location of the maximum bending moment in the pile matches the ultimate bending moment for single piles. This is consistent with pile deflection measured from inclinometer data. Additionally, the resolution of the FEM mesh used in the simulations significantly affects the pile behavior in the modeling.