Keywords: Fondation ; Mur de soutenement ; Pieux ; Capacite portante ; Ancrage ; Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08

Foundation analysis and design

Effects of drop energy on SPT value of soil in Bangladesh context

Due to variation in soil layers, it is not easy for engineer to be assured that theoretical design of piles comply with the actual site condition. Thus, every design of piled foundations carries its own uncertainty and risk. This project evaluates the applicability of eight methods to predict the ultimate bearing capacity of spun driven friction piles. Analyses and evaluations were conducted on four piles of different sizes and lengths that failed during pile load testing. The load test interpretation methods, pile driving formulae, as well as the Meyerhof method (static analysis) were used to estimate the bearing capacities (Qp) of the investigated piles. The failure loads were the maximum measured load carrying capacities (Qm) from pile load test. The pile capacities determined using the different methods were compared with the measured pile capacities obtained from pile load tests. Three criteria were selected as basis of evaluation: the best fit line for Qp versus Qm, the arithmetic mean and standard deviation for the ratio of Qp/Qm, and the cumulative probability for Qp/Qm. Results of the analyses show that the best performing method is Butler and Hoy method (load test interpretation method). This method is ranked number one according to the mentioned criteria

background

Prediction of ultimate load bearing capacity of driven piles

One of the most fundamental problems in the field of geotechnical engineering is the prediction of bearing capacity and settlement of shallow foundations on cohesion-less soil subjected to vertical central loading. The fact is that commonly used “SHAPE FACTORS” in the current design practice for estimating the bearing capacity and modulus of subgrade reaction of a shallow foundation are partially empirical values proposed by (Terzaghi, 1943). On the other hand, the current design of shallow foundation on cohesionless soil does not take into consideration the scale effect between the soil particles and foundation geometry. This may result in an excessively conservative design, which in turn results in unnecessary costs of the foundation. Therefore, and to take into account the realistic effect of the three-dimensional mechanism of soil deformation for foundations with various aspect ratios B/L on the shape factor in the classical formulas and theories of ultimate bearing capacity of shallow foundation, a series of small-scale model foundation tests were carried out on a practical type of sand (Toyoura sand) and the three-dimensional mechanism of deformation has been closely monitored and recorded at the end of each performed test. This research presents the main observations and results of the square, rectangular and strip model tests with constant foundation base width B conducted on compacted sand. Finally, the results are presented and compared to those from literature and preliminary conclusions and recommendations are drawn.

/pdf/influence-of-aspect-ratio-on-the-bearing-capacity-and-2rdoqqjqca.pdf

Influence of Aspect Ratio on the Bearing Capacity and Correlated Modulus ofSubgrade Reaction for Shallow Foundations on Dense Sand

vii CHAPTER 1: INTRODUCTION 1 1.1 Scope of Thesis 1 1.2 Background of the New Orleans Area 1 1.3 Background Information on the SELA Project 2 1.4 Location and Description of Project Sites 3 1.5 Purpose of Geotechnical Instrumentation Program 6 1.6 Objectives of Thesis 6 1.7 Organization of Thesis 6 CHAPTER 2: LITERARY RESEARCH 8 2.1 Sheet Pile Walls 8 2.2 Loads On Sheet Pile Walls 10 2.2.1 Earth Pressure Theories 10 2.2.1.1 Rankine Theory 12 2.2.1.2 Coulomb Theory 14 2.2.2 Surcharge Loads 16 2.2.2.1 Uniform Surcharge 17 2.2.2.2 Point Loads 17 2.2.2.3 Line Loads 19 2.2.2.4 Strip Loads 19

/pdf/a-comparison-of-predicted-brace-loads-in-temporary-retaining-fpn2bd9k3f.pdf

A Comparison of Predicted Brace Loads in Temporary Retaining Structures and Observed Brace Loads in Two Full Scale Test Sections

https://www.jstage.jst.go.jp/article/jscej1984/1998/610/1998_610_69/_pdf

Foundation analysis and design

Citations

Effects of drop energy on SPT value of soil in Bangladesh context

Prediction of ultimate load bearing capacity of driven piles

Influence of Aspect Ratio on the Bearing Capacity and Correlated Modulus ofSubgrade Reaction for Shallow Foundations on Dense Sand

A Comparison of Predicted Brace Loads in Temporary Retaining Structures and Observed Brace Loads in Two Full Scale Test Sections

A study on horizontal plastic ground reaction of pier foundation with inclined loads

Related Papers (5)

Soil mechanics in engineering practice

Theoretical Soil Mechanics

Pile Foundation Analysis and Design

Principles of Foundation Engineering

Analysis of Ultimate Loads of Shallow Foundations