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Simple constitutive models to study the influence of installation damage on the load-strain response of two geogrids

Simple constitutive models to study the influence of installation damage on the load-strain response of two geogrids
Simple constitutive models to study the influence of installation damage on the load-strain response of two geogrids
A key factor affecting the tensile response of geosynthetics is installation damage, represented by a reduction factor capturing changes in tensile strength. Although often geosynthetics are represented in numerical models by simple linear-elastic constitutive models and a stiffness, the response of geosynthetics to loading can be represented more realistically by non-linear constitutive models. Herein, simple constitutive models were used to represent the short-term tensile response of two geogrids (woven geogrid and uniaxial extruded geogrid). The tensile response of samples exhumed after field installation under real conditions was compared to that of the corresponding undamaged samples (as-received). The changes in response, particularly the change in tensile strength and stiffness, were presented and discussed. The polynomial models (order 6) approximated the experimental data better than the hyperbolic models. Contrary to what has been reported in the literature, for the materials and test conditions presented herein and for the hyperbolic models, the parameter b cannot be estimated as the inverse of the materials tensile strength and the parameter α is not a material constant. Both polynomial and hyperbolic models approximated well the tangent stiffness for 2% strain obtained experimentally. The model parameters were normalised to the reduction factor for installation damage; for the hyperbolic models, the parameter b was practically unchanged after exhumation of the samples, while parameters a and α showed no clear trend; the values of the stiffness normalised to the reduction factor for installation damage were not constant.
constitutive models, geogrids, installation damage, tensile response, stiffness, reduction factor
Paula, Antonio Miguel
0dbe22f4-a8ce-4e0e-b677-52d9abe59348
Pinho-Lopes, Margarida
b7e5f7d6-90d8-48cc-b991-0495445fcea4
Paula, Antonio Miguel
0dbe22f4-a8ce-4e0e-b677-52d9abe59348
Pinho-Lopes, Margarida
b7e5f7d6-90d8-48cc-b991-0495445fcea4

Paula, Antonio Miguel and Pinho-Lopes, Margarida (2018) Simple constitutive models to study the influence of installation damage on the load-strain response of two geogrids. 11th International Conference on Geosynthetics, , Seoul, Korea, Republic of. 16 - 21 Sep 2018. 8 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

A key factor affecting the tensile response of geosynthetics is installation damage, represented by a reduction factor capturing changes in tensile strength. Although often geosynthetics are represented in numerical models by simple linear-elastic constitutive models and a stiffness, the response of geosynthetics to loading can be represented more realistically by non-linear constitutive models. Herein, simple constitutive models were used to represent the short-term tensile response of two geogrids (woven geogrid and uniaxial extruded geogrid). The tensile response of samples exhumed after field installation under real conditions was compared to that of the corresponding undamaged samples (as-received). The changes in response, particularly the change in tensile strength and stiffness, were presented and discussed. The polynomial models (order 6) approximated the experimental data better than the hyperbolic models. Contrary to what has been reported in the literature, for the materials and test conditions presented herein and for the hyperbolic models, the parameter b cannot be estimated as the inverse of the materials tensile strength and the parameter α is not a material constant. Both polynomial and hyperbolic models approximated well the tangent stiffness for 2% strain obtained experimentally. The model parameters were normalised to the reduction factor for installation damage; for the hyperbolic models, the parameter b was practically unchanged after exhumation of the samples, while parameters a and α showed no clear trend; the values of the stiffness normalised to the reduction factor for installation damage were not constant.

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Accepted/In Press date: 29 December 2017
Published date: 16 September 2018
Venue - Dates: 11th International Conference on Geosynthetics, , Seoul, Korea, Republic of, 2018-09-16 - 2018-09-21
Keywords: constitutive models, geogrids, installation damage, tensile response, stiffness, reduction factor

Identifiers

Local EPrints ID: 425797
URI: http://eprints.soton.ac.uk/id/eprint/425797
PURE UUID: cf65e0d1-738c-4e98-9a24-5f8416ec60e2
ORCID for Margarida Pinho-Lopes: ORCID iD orcid.org/0000-0003-0808-6307

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Date deposited: 02 Nov 2018 17:30
Last modified: 05 Nov 2020 17:32

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