Green River Bridge Pier 1 Landslide, King County, Washington
This paper will discuss how early November 2008 storms caused the retrogression of a small landslide located below the south abutment of a 75 year old, multi-pier highway bridge that spans the Green River gorge, located on State Route 169 about 30 miles southeast of Seattle, Washington. The landslide retrogression resulted in more than a half inch of movement of the abutment and a 220 day closure to construct remedial foundation support and drainage improvements. Interim stabilization efforts enacted before and after the movement of the abutment included soil nailing the undermined approach fill, installing horizontal drains, and, following the highway closure, unloading the upper slide mass by removing the 30-ft high approach fill. Permanent measures involved a secant wall of 4-ft diameter drilled shafts, tied back with 300 kip ground anchors, and the installation of a 300-ft long deep cut-off trench to intercept groundwater above the active slide limits.
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Corporate Authors:
New York State Thruway Authority
200 Southern Boulevard, P.O. Box 189
Albany, NY United States 12201-0189 -
Authors:
- Badger, Thomas C
- Smith, E L
- Lowell, S M
- Fryer, M
- Cuthbertson, J
- Allen, Tony M
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Conference:
- 60th Highway Geology Symposium
- Location: Buffalo NY, United States
- Date: 2009-9-29 to 2009-10-1
- Publication Date: 2009
Language
- English
Media Info
- Media Type: CD-ROM
- Features: Figures; Maps; Photos;
- Pagination: pp 158-168
- Monograph Title: Proceedings of the 60th Highway Geology Symposium
Subject/Index Terms
- TRT Terms: Bridge abutments; Bridge piers; Fillers (Materials); Geotechnical engineering; Groundwater; Landslides; Slope failure; Soil nailing
- Geographic Terms: King County (Washington)
- Subject Areas: Bridges and other structures; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 01142319
- Record Type: Publication
- Files: TRIS
- Created Date: Oct 21 2009 8:29AM