Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

The natural river processes along a 30 m high riverbank of one of the largest tributaries to Lake Superior cause periodic landslides. After arresting toe erosion, local authorities needed to protect the infrastructure at the crest from further damage as the slope continued to flatten towards its long-term angle of repose. A long-term hazard management strategy was applied using the cautionary zone approach (CZA). Design criteria included a target safety factor, no construction impacts, no maintenance and a 75-year design life. The solution drew from 3 technologies: soil nails, laterally loaded piles and biotechnical stabilization. Steel nails, 35 mm diameter, were designed in bending perpendicular to slip surfaces and installed on a 1 to 1.5 m grid. Lightweight equipment working on the slope installed the 4 to 12 m long nails very rapidly without drilling or grouting. For shallow flow slides around a rigid nail, plate heads were added. A facing of roots controlled soil movements between nails and provided a natural look with the system completely out of sight. Three years of performance monitoring data are presented, and confirm a successful case history. This paper describes an innovative approach used to stabilize a landslide prone area in an urban environment.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Stabilization of a 30 m High Riverbank in Canada with Nails, Plates and Roots

Arlington, Virginia

The natural river processes along a 30 m high riverbank of one of the largest tributaries to Lake Superior cause periodic landslides. After arresting toe erosion, local authorities needed to protect the infrastructure at the crest from further damage as the slope continued to flatten towards its long-term angle of repose. A long-term hazard management strategy was applied using the cautionary zone approach (CZA). Design criteria included a target safety factor, no construction impacts, no maintenance and a 75-year design life. The solution drew from 3 technologies: soil nails, laterally loaded piles and biotechnical stabilization. Steel nails, 35 mm diameter, were designed in bending perpendicular to slip surfaces and installed on a 1 to 1.5 m grid. Lightweight equipment working on the slope installed the 4 to 12 m long nails very rapidly without drilling or grouting. For shallow flow slides around a rigid nail, plate heads were added. A facing of roots controlled soil movements between nails and provided a natural look with the system completely out of sight. Three years of performance monitoring data are presented, and confirm a successful case history. This paper describes an innovative approach used to stabilize a landslide prone area in an urban environment.