Measuring hydraulic properties of geotextiles after installation damage

Since geotextiles have been progressively incorporated into coastal protection structures, the influence of installation damage on them has been the primary concern. During installation/construction, geotextiles are repeatedly subjected to high mechanical stresses which often exceed service stress....

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Bibliographic Details
Published in:Geotextiles and geomembranes 2017-10, Vol.45 (5), p.462-470
Main Authors: Cheah, C., Gallage, C., Dawes, L., Kendall, P.
Format: Article
Language:English
Subjects:
Apparent opening size
Armor
Coastal engineering
Coastal structures
Coasts
Construction
Damage assessment
Design engineering
Design optimization
Drop Rock Test
Geosynthetics
Geotechnical fabrics
Hydraulic efficiency
Hydraulics
Mechanical properties
Permittivity
Piercing
Structural damage
Studies
Unsaturated subgrade
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Summary:Since geotextiles have been progressively incorporated into coastal protection structures, the influence of installation damage on them has been the primary concern. During installation/construction, geotextiles are repeatedly subjected to high mechanical stresses which often exceed service stress. It is therefore vital to evaluate the mechanical and hydraulic damage and determine the consequences of these damages to better develop criteria for selection of suitable products. As these damages could reduce the material's mechanical strength and hydraulic efficiency, or in the severest form of damage, puncturing, would end the separation function. The properties investigated in this paper include the permittivity and apparent opening size (AOS) of geotextiles. Generally, the greater the drop energy of armour units applied to geotextiles, the greater the potential for damage. Findings show that the residual permittivity could increase significantly, 45% during installation. The preliminary design of coastal structures will be optimised as engineers and designers can better estimate the amount of damage on geotextiles upon installation.
ISSN:0266-1144
1879-3584
DOI:10.1016/j.geotexmem.2017.07.002