Development of a direct simple shear apparatus for peat

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Title: Development of a direct simple shear apparatus for peat
Authors: Boylan, Noel
Long, Michael (Michael M.)
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Date: Mar-2009
Abstract: This paper discusses the design and development of a new direct simple shear (DSS) apparatus for testing peat soils. The apparatus has been designed to test peat at low effective stresses, representative of its in-situ condition and allow the deformation of the specimen to be monitored. This device uses Particle Image Velocimetry (PIV) image analysis techniques to monitor the side of the peat specimen and provide an insight into the behaviour of peat during shearing. A set of comparative tests on remoulded clay have been conducted with another widely used DSS apparatus and has shown both to yield similar undrained strength ratios (su/σ'vc) for a range of stress levels. Application of the apparatus to peat soils is demonstrated by a set of tests on a high water content blanket bog peat. Analysis of these tests using the PIV technique reveals the complex shear strain and volumetric strain behaviour of peat undergoing shearing. Identification of partial slippage of a specimen is also demonstrated through these analyses.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: ASTM
Copyright (published version): 2008 ASTM
Keywords: PeatsOrganic soilsDirect simple shearLaboratory testingImage analysisParticle image velocimetry
Subject LCSH: Peat--Testing
Shear strength of soils--Testing
Particle image velocimetry
DOI: 10.1520/GTJ101703
Language: en
Status of Item: Peer reviewed
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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