The mechanics of continuous flight augers in clay
The mechanics of continuous flight augers in clay
By the late 1980’s the method of Continuous Flight Auger (CFA) piling was the most popular method of manufacturing small diameter piles in the UK. The growth of this industry could mainly be attributed to its small environmental impact and speed of the procedure. The main disadvantage of CFA piles was the lack of predictability of their performance. This research has been concerned with improving the predictability of CFA pile behaviour in clay by using measurements made on a CFA auger penetrating into clay to gain information on the subsoil conditions. To achieve this aim, a thorough understanding of the mechanics of a CFA auger penetrating clay was required.
A small-scale CFA model was designed, built and instrumented to measure torque and axial load on several different augers in the laboratory. The design of the model as such that close control of the auger movement could be achieved. A technique was developed to prepare a stiff clay sample in the laboratory with uniform and repeatable properties. The model rig was then used to advance the augers into these clay samples. A valuable understanding of the mechanics of augers penetrating clay was gained from the analysis of the results obtained on the model rig. Results from the model tests were then used to recommend techniques of pile capacity prediction using improved instrumentation on the full-scale CFA rigs.
University of Southampton
Rust, Martin
1177243e-1a9a-40b0-a26c-4cf75948cceb
2003
Rust, Martin
1177243e-1a9a-40b0-a26c-4cf75948cceb
Rust, Martin
(2003)
The mechanics of continuous flight augers in clay.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
By the late 1980’s the method of Continuous Flight Auger (CFA) piling was the most popular method of manufacturing small diameter piles in the UK. The growth of this industry could mainly be attributed to its small environmental impact and speed of the procedure. The main disadvantage of CFA piles was the lack of predictability of their performance. This research has been concerned with improving the predictability of CFA pile behaviour in clay by using measurements made on a CFA auger penetrating into clay to gain information on the subsoil conditions. To achieve this aim, a thorough understanding of the mechanics of a CFA auger penetrating clay was required.
A small-scale CFA model was designed, built and instrumented to measure torque and axial load on several different augers in the laboratory. The design of the model as such that close control of the auger movement could be achieved. A technique was developed to prepare a stiff clay sample in the laboratory with uniform and repeatable properties. The model rig was then used to advance the augers into these clay samples. A valuable understanding of the mechanics of augers penetrating clay was gained from the analysis of the results obtained on the model rig. Results from the model tests were then used to recommend techniques of pile capacity prediction using improved instrumentation on the full-scale CFA rigs.
Text
922698.pdf
- Version of Record
More information
Published date: 2003
Identifiers
Local EPrints ID: 465178
URI: http://eprints.soton.ac.uk/id/eprint/465178
PURE UUID: 77376144-2517-4ad8-8c95-4ac23f9fea3c
Catalogue record
Date deposited: 05 Jul 2022 00:27
Last modified: 16 Mar 2024 20:00
Export record
Contributors
Author:
Martin Rust
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics