Elm Street Rockslide Repairs Montpelier City Council Meeting February 22, 2006.

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Presentation transcript:

Elm Street Rockslide Repairs Montpelier City Council Meeting February 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