00936035

Component

https://doi.org/10.3141/1808-09

http://scholar.google.com...iams&publication_year=2002

A 1995 landslide diverted the North Fork of the Virgin River in Zion National Park, Utah, causing complete erosion of 180 m (590 ft) of the Valley Floor Highway, the park's main access road. Buried utilities were damaged and 450 people were left stranded. Road reconstruction and maintenance have been ongoing in many phases since 1995 and have proved to be difficult because of environmental and physical constraints imposed by the river and by steep slopes of recent and historic landslide debris on both sides of the valley. In an effort to limit disturbance to the landslide slope while maintaining a two-lane access road adjacent to the river, a compound retaining wall was designed and constructed through the narrow reach of the valley. The lower part of the wall consists of cantilevered secant piles, providing 3.6 m (12 ft) of scour protection, and the upper part of the wall is a mechanically stabilized earth wall. Intermittently spaced foundation piles reduce the lateral loads on the secant piles, making cantilever support practical.

This paper appears in Transportation Research Record No. 1808, Soil Mechanics 2002.

English

p. 76-83

2002

Transportation Research Record

0309077346

Figures (3) ; Photos (3) ; References (4) ; Tables (1)

Access roads; Canyons; Mechanically stabilized earth; Pile foundations; Protection; Retaining walls; Scour

Cantilevered secant piles; Lateral loads

Zion Canyon; Zion National Park

Geotechnology; Highways; Security and Emergencies; I42: Soil Mechanics

TRIS, TRB, ATRI

Jan 2 2003 12:00AM

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