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Etats-Unis
Rocky Mountain National Park Grand Ditch Slope Repair 2016 - Geobrugg Rocky Mountain National Park Grand Ditch Slope Repair 2016 - Geobrugg
Rocky Mountain National Park Grand Ditch Slope Repair 2016 - Geobrugg Rocky Mountain National Park Grand Ditch Slope Repair 2016 - Geobrugg

Rocky Mountain National Park Grand Ditch Slope Repair

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Adresse
Grand Ditch - Little Yellowstone Trail
Ville
Rocky Mountain National Park
Pays / Région
Etats-Unis
Année d’installation
2016
Client
US National Park Service
Ingénierie
US National Park Service
Autres sociétés participantes
Midwest Rockfall
Objet protégé
Infrastructure touristique
Systèmes
TECCO® G65/3
Protection anticorrosion
GEOBRUGG ULTRACOATING®
Zone stabilisée
7900 m²
Hauteur de la pente
300 m
Inclinaison de la pente
45 °
Exposition
Sud
Géologie

Clayey sand with rock fragments (0- 10'), underlain with decomposed rhyolite (10' - 15') and rhyolite with interbedded clay and clayey sand lenses (15' - 50').

Situation de départ


On May 30, 2003, the Grand Ditch, a water-diversion canal in the northwest corner of Rocky Mountain National Park breached its bank due to a suspected rockslide into the ditch. At the time of the event, estimated flow from the ditch was 260 cubic feet per minute.

The breach saturated an adjacent slope which gave way, sending a massive (48,000 cubic yards) mud- and rock-slide down into Lulu Creek and the headwaters of the Colorado River. Approximately 22 acres and 1.5 miles of stream, riparian, upland, and wetland habitat were damaged.

Rocky Mountain National Park personnel and a team of cooperating researchers evaluated the extent of the damage and determined the desired future conditions for the impacted area.

Restoration needed to address many concerns in this rugged and remote area. These concerns included short-and-long-term potential impacts to wilderness character; geological resources; geological hazards; surface and groundwater hydrology; stream channel, floodplain and wetland morphology, and function; water quality; riparian and wetland communities; species of special concern (plants and animals); wildlife habitat and visitor experience.

An Environmental Impact Statement (EIS) was prepared. The results included recommendations for stabilizing the steep, unstable slopes with an engineered solution that would address both the geotechnical and ecological concerns.

Description

To comply with the EIS recommendations and to address the objectives of the project, approximately 85,000 square feet of Anchored TECCO G65/3mm was specified for the project.

As this is an exposed slope and is visible across a large valley, a colored powder coating was applied to the TECCO® System to match the color of the surrounding slope, rendering the TECCO® System virtually invisible.  

The Park Service intends on allowing the slope to revegetate naturally, which may take some time due to the elevation (10,000 ft), and the slow growth of the natural vegetation. However, seeds of the natural vegetation were gathered by the Park Service in the event reseeding may be required.

Due to the remote location and the short construction season, availability of materials, powder coating, and delivery were of major concern to the contractor and project owner. The TECCO® System and associated components were easily delivered in a timely manner to meet the construction schedule.  

Approximately 500 grouted anchors were drilled and the TECCO® System was placed to stabilize the slope and prevent further raveling of rock.

The project was conducted and completed in the spring / summer of 2016.

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Kevin H. Coyle
Kevin H. Coyle
Regional Manager Northeast
Natural Hazards
Geobrugg North America, LLC
3 Beaudet Terr
Columbia CT 06237 / Etats-Unis
Téléphone +1 860 377 3230

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Saleh Feidi
Saleh Feidi
Regional Manager California
Natural Hazards
Geobrugg North America, LLC
8921 Emperor Ave.
San Gabriel, California 91775 / Etats-Unis
Téléphone +1 909 706 8964

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John Kalejta
John Kalejta
Regional Manager Central US
Natural Hazards
Geobrugg North America, LLC
3215 67th Avenue Pl
Greeley CO 80634 / Etats-Unis
Téléphone +1 505 220 1404

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Bob Lyne
Bob Lyne
Regional Manager Southeast
Natural Hazards
Geobrugg North America, LLC
8004 Windspray Drive
Summerfield NC 27358 / Etats-Unis
Téléphone +1 336 337 0945

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Pierce Runnels, Civil Engineer
Pierce Runnels, Civil Engineer
General Manager Geobrugg North America
Natural Hazards
Geobrugg North America, LLC
22 Centro Algodones
Téléphone +1 505 771 4080
Mobile +1 505 400 0796

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Tim Shevlin
Tim Shevlin
Sales Director
Natural Hazards
Geobrugg North America, LLC
4676 Commercial St. SE, PMB 174
Salem OR 97302 / Etats-Unis
Téléphone +1 503 423 7258

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