Geomembrane–sand interface frictional properties as determined by inclined board and shear box tests

Geomembrane–sand interface shear strength parameters were measured using inclined board and standard size direct shear box tests. Ottawa sand with well-rounded particles and a crushed stone with very angular particles but of very similar size range and gradation along with smooth and rough HDPE geom...

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Bibliographic Details
Published in:Geotextiles and geomembranes 1998-08, Vol.16 (4), p.207-219
Main Authors: Izgin, Mizyal, Wasti, Yildiz
Format: Article
Language:English
Subjects:
Geomembrane
Interface shear
Sand
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Summary:Geomembrane–sand interface shear strength parameters were measured using inclined board and standard size direct shear box tests. Ottawa sand with well-rounded particles and a crushed stone with very angular particles but of very similar size range and gradation along with smooth and rough HDPE geomembranes were used in the experiments. Inclined board tests were conducted under a normal stress range of about 5–50 kPa on variable size interface areas. In direct shear tests the applied normal stresses were 14–200 kPa. It has been found that inclined board test results produce plots of interface shear strength versus normal stress that can be approximated by straight lines through the origin. Direct shear tests on the other hand gave envelopes with adhesion intercept and larger interface friction angles. Interface friction angles for sand with rounded particles were more sensitive to surface roughness of geomembrane and were different for smooth geomembranes of different brands.
ISSN:0266-1144
1879-3584
DOI:10.1016/S0266-1144(98)00010-7