Tensile properties of geosynthetics after installation damage
Tensile properties of geosynthetics after installation damage
In this paper, data from field installation trials of geosynthetics and laboratory tests are presented and analysed. The influence of several factors was assessed, namely nominal strength and type of geosynthetic, soil, compaction energy and method used to induce installation damage. Visual observations using a scanning electron microscope were performed. From the data collected, reduction factors for installation damage were derived using tensile strength values (traditional approach) and stiffness modulus (for 2% strain). Relative to the stiffness approach, the results obtained indicate that the traditional approach can be conservative. The reduction factors, determined using the traditional approach, were also compared with interval estimates from the literature. To contribute to supporting a shift from a factor of safety approach to a limit state design, bias statistics to correct the deterministic predictions were determined from the results. Different correlations were also established to enable using these results to interpolate reduction factors for similar installation conditions and/or geosynthetics from the same family of products. Installation damage reduction factors should be used in limit state design (ultimate and serviceability). Nevertheless, the stiffness approach can only be used for limit states where tensile failure of the geosynthetics will not occur.
geotextiles, membranes and geogrids, strength and testing of materials, geotechnical engineering
161-178
Pinho-Lopes, M.
b7e5f7d6-90d8-48cc-b991-0495445fcea4
Lopes, M.L.
dca0c06e-aaa8-47df-923f-5fa9973552ba
August 2014
Pinho-Lopes, M.
b7e5f7d6-90d8-48cc-b991-0495445fcea4
Lopes, M.L.
dca0c06e-aaa8-47df-923f-5fa9973552ba
Pinho-Lopes, M. and Lopes, M.L.
(2014)
Tensile properties of geosynthetics after installation damage.
Environmental Geotechnics, 1 (3), .
(doi:10.1680/envgeo.13.00032).
Abstract
In this paper, data from field installation trials of geosynthetics and laboratory tests are presented and analysed. The influence of several factors was assessed, namely nominal strength and type of geosynthetic, soil, compaction energy and method used to induce installation damage. Visual observations using a scanning electron microscope were performed. From the data collected, reduction factors for installation damage were derived using tensile strength values (traditional approach) and stiffness modulus (for 2% strain). Relative to the stiffness approach, the results obtained indicate that the traditional approach can be conservative. The reduction factors, determined using the traditional approach, were also compared with interval estimates from the literature. To contribute to supporting a shift from a factor of safety approach to a limit state design, bias statistics to correct the deterministic predictions were determined from the results. Different correlations were also established to enable using these results to interpolate reduction factors for similar installation conditions and/or geosynthetics from the same family of products. Installation damage reduction factors should be used in limit state design (ultimate and serviceability). Nevertheless, the stiffness approach can only be used for limit states where tensile failure of the geosynthetics will not occur.
Text
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- Accepted Manuscript
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Accepted/In Press date: 24 July 2013
e-pub ahead of print date: August 2014
Published date: August 2014
Keywords:
geotextiles, membranes and geogrids, strength and testing of materials, geotechnical engineering
Organisations:
Infrastructure Group
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Local EPrints ID: 374947
URI: http://eprints.soton.ac.uk/id/eprint/374947
PURE UUID: be20da2c-d81c-4dec-ad73-f8e8eeee1415
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Date deposited: 09 Mar 2015 10:57
Last modified: 15 Mar 2024 03:46
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Author:
M.L. Lopes
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