Screw Piles - Installation and Design in Stiff Clay

A.E. Holeyman

• Publisher: CRC Press
• Year: 2020
• Print ISBN: 9789058091925
• eBook ISBN: 9781000151145
• Topic: Technologie et ingénierie
• Subtopic: Agronomie

This volume provides a snapshot of the current thinking and development perspectives on the installation and design of screw piles within the framework of Eurocode 7.

The material included provides background on the various aspects of screw piles, with particular reference to stiff clays:

1. Exptensive description of a multi-million Euros research program on the loading behaviour of screw piles;

2. Geological and geotechnical characterization of Boom clay, and overview of screw pile testing over the last 30 years;

3. Results of the various load tests recently performed on 30 piles: static, dynamic, statnamic, and integrity and outcome of an international prediction event;

4. Tentative translation of the current body of knowledge in terms of potential application rules to be soon ascenrtained at the national level, as required by Eurocode 7.

The remarkable aspects of the soil displacement piles covered in this book is an exceptionally low variability of geotechnical parameters,installation performance, and pile capacity calculations.

Design of axially loaded piles - 1997 Belgian Practice

A Holeyman (General Reporter)

U. C.L - Louvain-la-Neuve

C. Bauduin

Besix

M. Bottiau

Socofonda

P. Debacker

Federal Public Buildings Agency

F. De Cock

Franki Foundations

E. Dupont

Fundex

J.L. Hilde

Technical Control Office Seco

C. Legrand and N. Huybrechts

CSTC/WTCB/Belgian Building Research Institute

P. Menge

Ministry of the Flemish Community/Ghent University

J.P. Miller

Tractebel

G. Simon

Ministry of Equipment and Transport of the Walloon Region

PREAMBLE: This report has been put together by combining individual contributions provided by the authors listed above, reviewing assembled drafts in plenary meetings, and allowing the General Reporter to edit the report for general consistency. The sole intent of the report is to provide our foreign colleagues with a pragmatic representation of the current piling design practice in Belgium. It is therefore explicitly stated that this report should not be construed as superseding work products presently elaborated by several professional bodies such as Committees, Ministries, and Institutes. As no final decisions have been made regarding the Belgian National Application Document (NAD) for EC7 so far, references to the NAD contained in this report have to be considered as tentative.

1 REGIONAL GEOLOGY

The Belgian territory is rather flat with a continuous transition from a plain at the North Sea and the Dutch border to the highlands of the Ardennes, the highest point being situated at Botrange (694 m above sea level). The geology of the Tertiary and Quaternary formations in Belgium is characterised by a Southeast Northwest oriented epirogenetic axis [34], which follows the valleys of the rivers Haine, Sambre, Meuse and Vesdre (Figure 1), and which divides Belgium into approximately two equal parts.

In the North, the stratigraphy has been governed by fluctuations in the coastal line. Consequently the bedrock is covered by alternating Tertiary clay, sand and (occasionally) gravel sediments, with thickness up to hundreds of meters. The Quaternary Pleistocene formations have been heavily influenced by the glacial periods, giving rise to the formation of marine, coastal, river, lake or wind deposits of sand, clay, peat and silt (loess). Holocene erosion and river sedimentation, as well...

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Table of Contents
• Preface
• Organisation
• Acknowledgements
• Contributions
• Deep foundations and the need for research on screw piles in Belgium
• Engineering geology of the Boom Clay in the Antwerp area
• Soil investigation at Sint-Katelijne-Waver (Belgium)
• Design of axially loaded piles - 1997 Belgian practice
• A database approach to overview pile loading tests on displacement screw piles in Western Europe - 1970–2000
• Considerations on the influence of screw pile installation parameters on the overall pile behaviour
• Test campaign at Sint-Katelijne-Waver and installation techniques of screw piles.
• Results of the Static Pile Load Tests
• Results of dynamic and kinetic pile load tests and outcome of an international prediction event.
• Design procedure according to Eurocode 7 and analysis of the test results
• International activities of ITC-18
• Conclusions and perspectives
• Author index