3D numerical analysis of a pile under vertical and lateral loading

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3D numerical analysis of a pile under vertical and lateral loading

 

Author: Xiao, Haibei
Title: 3D numerical analysis of a pile under vertical and lateral loading
Degree: M.Sc.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Piling (Civil engineering)
Foundations.
Numerical analysis.
Department: Dept. of Civil and Structural Engineering
Pages: x, 83 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2329757
URI: http://theses.lib.polyu.edu.hk/handle/200/3796
Abstract: A pile foundation is a component of a structure used for carrying and transferring the load from the structure to the bearing ground. Generally, the pile foundations are divided into a pile cap and a group of piles. Piles are commonly made up by wood, steel, or reinforced concrete material. Considering the construction methods and loading distribution, the piles are classified into driven piles, bored piles, floating files, end-bearing piles, etc. This study presents numerical investigations into the load-displacement relationships of a single pile in a soil ground subjected to vertical and lateral loading. A review of literature shows that obvious discrepancies are found among different theories for prediction the load-displacement relationship for a single pile embedded in soil. In this project, a numerical soil-pile interaction model is established using a Finite Element method to investigate the pile-soil interaction mechanism. The elastic-plastic model with the Mohr-Coulomb failure criterion is adopted as the constitutive relationship for the soil. A linear elastic model is employed for the pile. The interaction between the pile and the surrounding soil are modelled thoroughly using contact elements based on master-slave concept to model the slippage between soil and pile. The numerical model is then used to analyze pile head load-displacement relationships which are important for the analysis of the soil-pile-superstructure interactions. Finally, an extensive parametric study is carried out to investigate the influence factors of soil properties: Young's Modulus, Poisson's ratio, cohesion, friction angle, and pile dimensions (length and diameter). The head displacement of the pile under vertical and lateral loadings is predicted from the parametric study for different pile geometries and different soil conditions. All the trends in these load-displacement curves can be categorised into two types: linear increasing at the beginning and increasing comparatively smoothly later. However, with different parameters, the curves look different. It is obviously that with higher Young's Modulus of soil and the larger length and diameter of the pile, load of the pile is higher. Poisson's ratio has its influence near the turning point of the curves. With higher cohesion, the turning point comes at the higher load level. And with higher friction angle, the curve goes for the higher levels after the turning point.

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