elm street rockslide repairs montpelier city council meeting february 22, 2006
TRANSCRIPT
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Elm Street Rockslide Repairs
Montpelier City Council MeetingFebruary 22, 2006
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Rockslides Happen
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THE PROBLEM:
Toppling of steeply dipping rock strata Sliding of toppled strata on lower slope
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Historic Slide Area
Slide scarp (light gray) at right crest, debris at toe of slope.
Lower chevron toppled debris set in motion
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Historic Slide Area
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Slide Mechanisms
Flexural Toppling at Crest
Lower chevron toppled debris set in motion
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Slide Mechanisms
Flexural Toppling at Crest
Lower chevron toppled debris set in motion
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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.
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Project Progress
Temporary Rockfall Protection Measures
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Project Progress
Stabilization of Cliff Street Slide Scarp Drainage Installation and Shotcrete Facing
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Project Progress
Utilities Relocation Shotcrete Application Monitoring of Loose Rocks
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Project Progress
Layout, Anchor installation and Setup of Rockfall Catch Fence
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Project Progress
Rock Nail Installation
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Project Progress
Water Main Relocated
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Project Progress
A Large Boulder…..
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Project Progress
Highwall Scaling and preparation of foundation area for
new retaining wall.
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Project Progress
Cliff Street Reopened February 14th.
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Project Progress
First layer of shotcrete and rock nails installed, Scaling progressing downslope
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What’s Next?
Completion of the retaining wall Rock Bolting of the Highwall
Drain hole drilling
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What’s Next?
Stabilization of soil slope transitions - Tecco Final Scaling
Installation of Concrete Barrier and paving on Cliff Street.
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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