The design of Duo-pile foundation system for elevated railways and highways is very critical with respect to lateral deflection which can affect serviceability and the stability of superstructure. In duo-pile system, interaction between piles, i.e., pile-soil-pile interaction plays a major role in final response of the system. Four types of pile-soil-pile interaction take place in duo-pile system: 1) Edge effect due to lateral load in transverse direction; 2) Shadow effect due to lateral load in longitudinal direction; 3) Couple effect due to moment transfer in the longitudinal direction and 4) Interaction due to vertical load. Objective of this study is to arrive at the appropriate spring constants for pile such that incorporating these interactions into an equivalent one-dimensional (1-D) model will approximately simulate the target displacement from the associated three-dimensional (3-D) model. Firstly, 3-D models comprising of only two piles are explained. For each interaction, appropriate 1-D models are presented and corresponding spring constant factors are proposed.
Subjects: Duo-pile, Pile-Soil-Pile Interactions, Spring Constant Factors, Couple Effect, Simplified 1-D Model
Author: Kolli Mohan Krishna, Ph.D. Scholar, Dhiman Basu, Assistant Professor and Amit Prashant, Professor
Publisher: DFI