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A correlation between friction angle and particle shape metrics in Quaternary coarse alluvia

A. Cheshomi, A. Fakher and C. J. F. P. Jones
A correlation between friction angle and particle shape metrics in Quaternary coarse alluvia
Quarterly Journal of Engineering Geology and Hydrogeology (May 2009) 42 (2): 145-155

Abstract

Very coarse-grained alluvia are challenging materials in geotechnical site characterization. The paper presents a method that can be used to find local correlations between the angle of friction and particle shape for very coarse-grained alluvia. The method is based on the results of a number of in situ direct shear tests carried out in horizontal galleries in the Quaternary coarse-grained alluvia of Tehran from which the angle of friction was determined. Following the in situ tests, images of the grains forming the alluvia were taken to determine their sphericity and roundness. The grain shapes were compared, based on a simple chart presented in previous research, and the importance of the sphericity/roundness ratio for the engineering characteristics is identified. A relationship between the angle of friction, sphericity and roundness is proposed for the coarse-grained alluvia of Tehran. The advantages of the proposed correlation are the elimination of the need for difficult sampling for laboratory tests and/or the costs of in situ tests in low-cost projects or during the preliminary site characterization of large projects. Using this approach similar correlations could be proposed to determine the geotechnical properties of other very coarse-grained alluvia.


ISSN: 1470-9236
EISSN: 2041-4803
Serial Title: Quarterly Journal of Engineering Geology and Hydrogeology
Serial Volume: 42
Serial Issue: 2
Title: A correlation between friction angle and particle shape metrics in Quaternary coarse alluvia
Affiliation: Tarbiat Modares University, Engineering Geology Department, Tehran, Iran
Pages: 145-155
Published: 20090501
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 64
Accession Number: 2009-066388
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Tehran University, IRN, IranUniversity of Newcastle upon Tyne, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200936
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