2nd Edition

Single Piles and Pile Groups Under Lateral Loading




ISBN 9780415469883
Published October 26, 2014 by CRC Press
508 Pages

USD $155.00

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Book Description

The complexities of designing piles for lateral loads are manifold as there are many forces that are critical to the design of big structures such as bridges, offshore and waterfront structures and retaining walls. The loads on structures should be supported either horizontally or laterally or in both directions and most structures have in common that they are founded on piles. To create solid foundations, the pile designer is driven towards finding the critical load on a certain structure, either by causing overload or by causing too much lateral deflection.

This second edition of Reese and Van Impe’s course book explores and explains lateral load design and procedures for designing piles and pile groups, accounting for the soil resistance, as related to the lateral deflection of the pile. It addresses the analysis of piles of varying stiffness installed into soils with a variety of characteristics, accounting for the axial load at the top of the pile and for the rotational restraint of the pile head. The presented method using load-transfer functions is currently applied in practice by thousands of engineering offices in the world. Moreover, various experimental case design examples, including the design of an offshore platform pile foundation are given to complement theory. The rich list of relevant publications will serve the user into further reading.

Designed as a textbook for senior undergraduate/graduate student courses in pile engineering, foundation engineering and related subjects, this set of book and CD-ROM will also benefit professionals in civil and mining engineering and in the applied earth sciences.

Table of Contents

Techniques for design
Introduction
Occurrence of laterally loaded piles
Nature of the soil response
Response of a pile to kinds of loading
Models for use in analyses of a single pile
Models for groups of piles under lateral loading
Status of current state-of-the-art

Derivation of equations and methods of solution
Introduction
Derivation of the differential equation
Solution for Epy =kpyx
Validity of the mechanics

Models for response of soil and weak rock
Introduction
Mechanics concerning response of soil to lateral loading
Influence of diameter on p-y curves
Influence of cyclic loading
Experimental methods of obtaining p-y curves
Early recommendations for computing p-y curves
p-y curves for clays
p-y curves for sands above and below the water table
p-y curves for layered soils
p-y curves for soil with both cohesion and a friction angle
Other recommendations for computing p-y curves
Modifications to p-y curves for sloping ground
Effect of batter
Shearing force at bottom of pile
p-y curves for weak rock
Selection of p-y curves

Structural characteristics of piles
Introduction
Computation of an equivalent diameter of a pile with a noncircular cross section
Mechanics for computation of Mult and EpIp as a function of bending moment and axial load
Stress-strain curves for normal-weight concrete and structural steel
Implementation of the method for a steel h-section
Implementation of the method for a steel pipe
Implementation of the method for a reinforced-concrete section
Approximation of moment of inertia for a reinforced-concrete section


Analysis of groups of piles subjected to inclined and eccentric loading
Introduction
Approach to analysis of groups of piles
Review of theories for the response of groups of piles to inclined and eccentric loads
Rational equations for the response of a group of piles under generalized loading
Laterally loaded piles
Axially loaded piles
Closely-spaced piles under lateral loading
Proposals for solving for influence coefficients for closely-spaced piles under axial loading
Analysis of an experiment with batter piles

Analysis of single piles and groups of piles subjected to active and passive loading
Nature of lateral loading
Active loading
Single piles or groups of piles subjected to active loading
Passive loading
Single piles or groups of piles subjected to passive loading

Case studies
Introduction
Piles installed into cohesive soils with no free water
Piles installed into cohesive soils with free water above ground surface
Piles installed in cohesionless soils
Piles installed into layered soils
Piles installed in c-φ soil
Piles installed in weak rock
Analysis of results of case studies
Comments on case studies

Testing of full-sized piles
Introduction
Designing the test program
Subsurface investigation
Installation of test pile
Testing techniques
Loading arrangements and instrumentation at the pile head
Testing for design of production piles
Example of testing a research pile for p-y curves
Summary

Implementation of factors of safety
Introduction
Limit states
Consequences of a failure
Philosophy concerning safety coefficient
Influence of nature of structure
Special problems in characterizing soil
Level of quality control
Two general approaches to selection of factor of safety
Global approach to selection of a factor of safety
Method of partial factors (psf)
Method of load and resistance factors (LRFD)
Concluding comment

Suggestions for design
Introduction
Range of factors to be considered in design
Validation of results from computations for single pile
Validation of results from computations for pile group
Additional steps in design

APPENDICES
Broms method for analysis of single piles under lateral loading
Nondimensional coefficients for piles with finite length, no axial load, constant Ep/Ip, and constant Epy
Difference equations for step-tapered beams on foundations having variable stiffness
Computer Program COM622
Non-dimensional curves for piles under lateral loading for case where Epy =kpyx
Tables of values of efficiency measured in tests of groups of piles under lateral loading
Horizontal stresses in soil near shaft during installation of a pile
Use of data from testing uninstrumented piles under lateral loading to obtain soil response
Eurocode principles related to geotechnical design
Discussion of factor of safety related to piles under axial load

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Author(s)

Biography

Professor Van Impe received his MSc and PhD degree in civil engineering at the Ghent University in Belgium where he has been professor of Geotechnics since 1982 and full professor since 1991. Prof. Van Impe has been an emeritus professor since March 2011 but remains active as a consultant and as manager of AGE bvba. He has been also a full professor at the Catholic University of Louvain in Belgium. He has a 35+ years long career in geotechnics.
He is a member of the Belgian Royal Academy of Overseas Sciences. He was elected Vice-President for Europe of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) in 1994, World President of ISSMGE in 2001 and the President of the umbrella society of the 3 geo-engineering sister societies FedIGS (Federation of the International Geo-Engineering Societies) in 2008. His main field of experience is deep foundations, ground improvement and soil parameter analysis, currently dealing mostly with crushable soils.