Temporary propping of deep excavations - guidance on design (C517D)

Demand is rising for buildings with more basement space, highway underpasses and rapid transit lines, all of which require excavation propping systems. Different methods for calculating prop loads have led to significant variation in these temporary works. There is a need for a clear and authoritative statement on the practical limits to which ground movements can be restricted.

This book provides guidance on the design of temporary propping systems for deep excavations with the aim at improving efficiency in their use while ensuring safety. It proposes a new empirical method for establishing temporary prop loads for design, developed from the Peck approach and based on a comprehensive survey of field measurements of prop loads.

The guidance covers single and multi-propped excavations of varied geometry, flexible and stiff walls, and the range of ground conditions found in the UK. It considers temperature effects, buildability, use of the Observational Method, instrumentation of props, and choice of temporary propping systems. Other subjects covered include contractual arrangements, performance requirements, allocation of responsibility and the overall legal context. Current methods of determining the prop load and of design are reviewed, and the book concludes with a summary of recommendations.

Please place your order for a PDF copy of this publication here. Our Customer Service team will email a link to a secure area of our website within 24 hours so you can download your guide.

ISBN: 978-0-86017-517-9
Author: Twine, D and Roscoe, H
Number of pages: 224 (PDF)
Publisher: CIRIA
Date of Publication: December 1999