Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The effect of geogrids under unbound sub base layers
It has been proven with the explained 1:1 scale tests that geogrids have a measurable positive effect on the bearing capacity and on the rutting of unbound layers in road constructions. That is even the case where only very small elongations of epsilon = 0.5% occur. Because of this the deformations are much smaller than the generally accepted 1.5% to 2% for the membrane effect of geogrids in unbound layers. How far the working mechanisms have changed from reinforcing to stabilizing effects, depending on the caused elongation, could not be evaluated. The limited number of double layer tests where very small elongations have been observed in the geogrid indicate such a change but do not allow any general statement. This needs some further investigations on thin multi-layer reinforced structures. The facts stated in this paper have been done based on the used aggregate and the provided geogrid. The evaluation is mainly based on the stress-strain behaviour of the used geogrid, which differ for other materials. Therefore the conclusions drawn in this paper have to be seen in conjunction with the used materials. Regarding the rutting a maximum reduction of the rut depth of 40% compared to the unreinforced situation has been observed while using a geogrid. Improvements of up to 30% have been noticed for the bearing capacity on top of a reinforced sub base layer. The validity of the determined design chart and the predicted effect of the geogrids under unbound sub grade layers have been proven on site and in the belonging recalculations.
The effect of geogrids under unbound sub base layers
It has been proven with the explained 1:1 scale tests that geogrids have a measurable positive effect on the bearing capacity and on the rutting of unbound layers in road constructions. That is even the case where only very small elongations of epsilon = 0.5% occur. Because of this the deformations are much smaller than the generally accepted 1.5% to 2% for the membrane effect of geogrids in unbound layers. How far the working mechanisms have changed from reinforcing to stabilizing effects, depending on the caused elongation, could not be evaluated. The limited number of double layer tests where very small elongations have been observed in the geogrid indicate such a change but do not allow any general statement. This needs some further investigations on thin multi-layer reinforced structures. The facts stated in this paper have been done based on the used aggregate and the provided geogrid. The evaluation is mainly based on the stress-strain behaviour of the used geogrid, which differ for other materials. Therefore the conclusions drawn in this paper have to be seen in conjunction with the used materials. Regarding the rutting a maximum reduction of the rut depth of 40% compared to the unreinforced situation has been observed while using a geogrid. Improvements of up to 30% have been noticed for the bearing capacity on top of a reinforced sub base layer. The validity of the determined design chart and the predicted effect of the geogrids under unbound sub grade layers have been proven on site and in the belonging recalculations.
The effect of geogrids under unbound sub base layers
Die Auswirkung von Geogittern unter ungebundenen Untergrundschichten
Retzlaff, J. (Autor:in) / Turczynski, U. (Autor:in) / Schwerdt, S. (Autor:in)
2006
6 Seiten, 9 Bilder, 3 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Geogitter , Verstärkung (Festigkeit) , Untergrund (Erde) , Straßenbau , Furchen , Fahrzeugrad , dynamische Belastung , Dehnungsmessung , Tragfähigkeit , Mehrschichtkonstruktion , Prüfmethode , Messen mechanischer Größen , Spannungsverteilung (mechanisch) , Bodenverfestigung , Spannungsdehnungsverhalten
The effect of geogrids under unbound sub base layers
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