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الأربعاء، 5 نوفمبر، 2014

Study of Pile Spacing and Its Effect on Group Behavior

Title: Study of Pile Spacing and Its Effect on Group Behavior
Author        : Ahmed Amr Ebeido
Collection   : M.Sc. Structural
Abstract:
 The current research examines the effect of pile spacing on pile group behavior. Non-linear elasto-plastic numerical simulation of the pile group is used utilizing the software package Simulia/Abaqus using Mohr-Coulomb constitutive model. Verification of numerical modelling by regenerating in-situ load-displacement relation for two driven pile load tests performed at a Shanghai site. The result of the numerical simulation fits well with the field load test. Moreover, sensitivity analysis on the effect of lateral boundary distance and element size on the computational results of numerical pile test is discussed. A parametric study on the effect of different pile spacings for two-pile group, four-pile group and infinite raft on piles configurations for three soil profiles is performed namely, uniform clay, uniform sand and clay over sand profiles. Group efficiency and group settlement ratio were calculated for the different pile spacings and different configurations.
Pile group efficiency is defined as the ratio of the pile capacity in a group to the single pile capacity evaluated at a certain strain level and the strain level is defined as the pile settlement normalized by the pile diameter. Group settlement ratio is defined as the ratio of the pile group settlement to the single pile settlement at the working load. Results show that, pile group efficiency decreases and group settlement ratio increases as the spacing between piles decrease.


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