grim%2E14%2E00025.pdf (1.74 MB)
Mixing and compaction of fibre- and lime-modified cohesive soil
journal contribution
posted on 2015-08-21, 13:34 authored by Craig Gelder, Gary FowmesFibre reinforcement is a versatile method of increasing the shear strength of soils for earthwork applications. However, research to date has encountered a number of problems when utilising cohesive host soils. The aim of this study was to develop a suitable site-applicable method of mixing fibre into cohesive host soils. Intermediate plasticity clay reinforced with monofilament polypropylene fibres was used in the laboratory investigations. In order to mix the fibres successfully, the initial moisture content of the host soil was increased prior to the introduction of fibres. By introducing quicklime, excess moisture was removed through the hydration process, and a portion of free water was effectively held within aggregations of flocculated clay particles, thereby having little influence on the dynamic boundaries. Fibrous inclusions within the clay clods resisted compactive effort, forming an interlocked structure. As a result, the optimum moisture content increased and the maximum dry density decreased. This trend was heavily dependent on the interfacial shear resistance along the fibre boundary, which consequently decreased as the water content increased or the compactive effort was increased. Results from strength tests confirmed that both peak and post-peak shear strength increased, creating a more ductile material capable of maintaining shear strength at high levels of strain.
Funding
The authors would like to acknowledge the support of Drake Fibres, and the support of Lewis Darwin and Paul Beetham.
History
School
- Architecture, Building and Civil Engineering
Published in
Proceedings of the ICE - Ground ImprovementCitation
GELDER, C. and FOWMES, G.J., 2015. Mixing and compaction of fibre- and lime-modified cohesive soil. Proceedings of the ICE - Ground Improvement, 169 (2), pp. 98-108.Publisher
© ICE PublishingVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
This article has been published in Proceedings of the ICE - Ground Improvement. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees.http://www.icevirtuallibrary.com/content/serial/grim;jsessionid=9tfbv7tfrhh0.x-telford-live-01ISSN
1755-0750eISSN
1755-0769Publisher version
Language
- en