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Elm Street Rockslide Repairs
Montpelier City Council MeetingFebruary 22, 2006
Rockslides Happen
THE PROBLEM:
Toppling of steeply dipping rock strata Sliding of toppled strata on lower slope
Historic Slide Area
Slide scarp (light gray) at right crest, debris at toe of slope.
Lower chevron toppled debris set in motion
Historic Slide Area
Slide Mechanisms
Flexural Toppling at Crest
Lower chevron toppled debris set in motion
Slide Mechanisms
Flexural Toppling at Crest
Lower chevron toppled debris set in motion
Proposed Repairs
Stabilize Flexural Toppling at Crest with Un-tensioned Rock Bolts called Rock Dowels; Scale slide debris and chevron toppled debris on the lower slope that could provide a source of future slide
debris; Stabilize and repair Cliff Street slide scarp with a rock nail retaining wall; Stabilize adjacent steep soil slopes with a Tecco® soil retention system; and Reduce the potential for further toppling with spot rock dowels, scaling, tree removal, dental shotcrete.
Project Progress
Temporary Rockfall Protection Measures
Project Progress
Stabilization of Cliff Street Slide Scarp Drainage Installation and Shotcrete Facing
Project Progress
Utilities Relocation Shotcrete Application Monitoring of Loose Rocks
Project Progress
Layout, Anchor installation and Setup of Rockfall Catch Fence
Project Progress
Rock Nail Installation
Project Progress
Water Main Relocated
Project Progress
A Large Boulder…..
Project Progress
Highwall Scaling and preparation of foundation area for
new retaining wall.
Project Progress
Cliff Street Reopened February 14th.
Project Progress
First layer of shotcrete and rock nails installed, Scaling progressing downslope
What’s Next?
Completion of the retaining wall Rock Bolting of the Highwall
Drain hole drilling
What’s Next?
Stabilization of soil slope transitions - Tecco Final Scaling
Installation of Concrete Barrier and paving on Cliff Street.
Acknowledgements
Tom McArdle – DPW Police Chief Doug Hoyt, Department and Fire
Department Mayor Mary Hooper & City Manager William Fraser VTrans – Tom Eliassen, Chris Benda, Bill McManus Vermont Geological Survey – Larry Becker and Jon
Kim Vermont Survey and Engineering
Dubois Construction
Special Thanks to Montpelier and State Folks
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