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Pull-out of backfill geogrid reinforcement for retaining walls

Reddy, D.V. / Gao, S. / Navarrete, F. / Lai, P.

This study addresses the long term pullout resistance carried out for two types of geogrids: HDPE and PET. Sand and limerock are used for the backfill material, with simulation of unsaturated and saturated conditions. Eight pullout test boxes were designed and constructed each with a specially designed stainless steel clamps. The measured strain-time relations for unsaturated and saturated soils for various levels of the pullout force until the peak value (up to 10000 hours of exposure), and varying distances from the loading end were plotted. The analytical simulation was by finite elements. The soil was modeled using conventional solid elements that are eight-noded isoparametric elements, and reinforcement with flexible beam elements. The experimental values were compared with some of the analytical ones. The normal and principal stresses in the soil, and the strains along the geogrid were determined from the finite element analysis for the unsaturated soil condition for various pullout force levels. There were significant reductions in the pullout resistance in saturated soil for the HDPE and PET geogrids. The results were analyzed, and a generalized method proposed for practical design using sliding resistance factors.

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Pull-out of backfill geogrid reinforcement for retaining walls

Reddy, D.V. / Gao, S. / Navarrete, F. / Lai, P.

This study addresses the long term pullout resistance carried out for two types of geogrids: HDPE and PET. Sand and limerock are used for the backfill material, with simulation of unsaturated and saturated conditions. Eight pullout test boxes were designed and constructed each with a specially designed stainless steel clamps. The measured strain-time relations for unsaturated and saturated soils for various levels of the pullout force until the peak value (up to 10000 hours of exposure), and varying distances from the loading end were plotted. The analytical simulation was by finite elements. The soil was modeled using conventional solid elements that are eight-noded isoparametric elements, and reinforcement with flexible beam elements. The experimental values were compared with some of the analytical ones. The normal and principal stresses in the soil, and the strains along the geogrid were determined from the finite element analysis for the unsaturated soil condition for various pullout force levels. There were significant reductions in the pullout resistance in saturated soil for the HDPE and PET geogrids. The results were analyzed, and a generalized method proposed for practical design using sliding resistance factors.

Pull-out of backfill geogrid reinforcement for retaining walls

Reddy, D.V. / Gao, S. / Navarrete, F. / Lai, P.

This study addresses the long term pullout resistance carried out for two types of geogrids: HDPE and PET. Sand and limerock are used for the backfill material, with simulation of unsaturated and saturated conditions. Eight pullout test boxes were designed and constructed each with a specially designed stainless steel clamps. The measured strain-time relations for unsaturated and saturated soils for various levels of the pullout force until the peak value (up to 10000 hours of exposure), and varying distances from the loading end were plotted. The analytical simulation was by finite elements. The soil was modeled using conventional solid elements that are eight-noded isoparametric elements, and reinforcement with flexible beam elements. The experimental values were compared with some of the analytical ones. The normal and principal stresses in the soil, and the strains along the geogrid were determined from the finite element analysis for the unsaturated soil condition for various pullout force levels. There were significant reductions in the pullout resistance in saturated soil for the HDPE and PET geogrids. The results were analyzed, and a generalized method proposed for practical design using sliding resistance factors.

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Title:

Pull-out of backfill geogrid reinforcement for retaining walls

Additional title:

Pull-out-Prüfung von Geogittern zur Verstärkung der Hinterfüllung von Stützmauern

Contributors:

Reddy, D.V. (author) / Gao, S. (author) / Navarrete, F. (author) / Lai, P. (author)

Published in:

EuroGeo, European Geosynthetics Conference, 2 ; 951-955

Publication date:

2000

Size:

5 Seiten, 12 Bilder, 5 Quellen

ISBN:

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

Geotextil , Gitterstoff , Polyethylen hoher Dichte , Polyethylenterephthalat , Verstärkung (Festigkeit) , Ausziehwiderstand , Hinterfüllung , Stützmauer , Natursand , Sättigungsgrad , Wassergehalt , Dehnung unter Belastung , Gleitwiderstand , Geogitter

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