A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
In 1996, consulting engineers discussed solutions for chronic problems caused by more than a dozen sliding failures per year on the outer slopes of a water treatment facility's lagoon. The facility consisted of a series of water retention lagoons enclosed within a perimeter levee. The lagoons were constructed with flexible membrane containment liners. The tops of the levees were capped with a paved access road. Several approaches were considered as possible solutions. The exterior slopes, with a gradient of 3H:1V, were composed of highly expansive clay soils. Because of the expansive nature of the levee embankment soils, the dope surfaces suffered from severe shrinkage cracking during the dry summer months. Water entered these cracks during the rainy season and found pathways into the deeper soil layers, creating instability in the slope structure. It was agreed that sliding failures triggered by saturation of the deeper soil layers had to be stopped. It was decided to further encase the levee by placing a liner system and surface erosion control on the outer slope. The liner system consisted of a 40 mil textured HDPE lining and a 28 oz. nonwoven geotextile. The installation would also use an erosion resistant slope cover to protect the liner. The Geoweb cellular confinement system was specified with crushed granite gravel infill for the final dope cover. This composite slope protection installation gave the owner a long-term, low maintenance solution for a difficult problem.
In 1996, consulting engineers discussed solutions for chronic problems caused by more than a dozen sliding failures per year on the outer slopes of a water treatment facility's lagoon. The facility consisted of a series of water retention lagoons enclosed within a perimeter levee. The lagoons were constructed with flexible membrane containment liners. The tops of the levees were capped with a paved access road. Several approaches were considered as possible solutions. The exterior slopes, with a gradient of 3H:1V, were composed of highly expansive clay soils. Because of the expansive nature of the levee embankment soils, the dope surfaces suffered from severe shrinkage cracking during the dry summer months. Water entered these cracks during the rainy season and found pathways into the deeper soil layers, creating instability in the slope structure. It was agreed that sliding failures triggered by saturation of the deeper soil layers had to be stopped. It was decided to further encase the levee by placing a liner system and surface erosion control on the outer slope. The liner system consisted of a 40 mil textured HDPE lining and a 28 oz. nonwoven geotextile. The installation would also use an erosion resistant slope cover to protect the liner. The Geoweb cellular confinement system was specified with crushed granite gravel infill for the final dope cover. This composite slope protection installation gave the owner a long-term, low maintenance solution for a difficult problem.
Composite protection for slopes
Geokunststoff zum Schutz von Böschungen
2003
2 Seiten, 3 Bilder
Article (Journal)
English
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