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  1. cds922

    Stone columns....

    dgillette, You are correct, blowout would be a concern; but, with a maintained upward pressure gradient our client is concerned that continued piping of material into the stone column voids could eventually lead to a blowout. My feelings are the same as yours, ending the column in a lower...
  2. cds922

    Stone columns....

    Stone columns are being used for the stabilization of a natural slope for the construction of a bridge embankment. The stone column has 2 primary functions 1) increase shear strength along the slip surface and 2) provide pressure relief due to the location of an artesian aquifer below the...
  3. cds922

    Quebec, Canada: Landslide

    More good pictures available at the Montreal Gazette including photos of past landslides of this type. http://www.montrealgazette.com/Gallery+Sinkhole+Jude/3013247/story.html http://www.montrealgazette.com/Gallery+History+Landslides/3014003/story.html
  4. cds922

    Quebec, Canada: Landslide

    http://www.cbc.ca/canada/montreal/story/2010/05/11/quebec-landslide.html
  5. cds922

    Stability of a bridge abutment?

    The particular bank is on the outside bend of a river meander, so it is actively being eroded. Down cutting during the last deglaciation oversteepened the slopes and caused the slope to fail and/or created shear zones, or failed along glacially disturbed shear zones. Failures of this nature a...
  6. cds922

    Stability of a bridge abutment?

    Thanks for the response. The FS of the upper surface is greater than 1.5 and has no further issue once the upper stabilization is implemented (shear key). The lower slip surface is too deep for a shear key and is under artesian conditions so a large excavation is not recommended. The FOS of...
  7. cds922

    Stability of a bridge abutment?

    I have been working on a project that involves stabilizing a natural slope on a riverbank in order to construct a bridge abutment. There are two slip surfaces, the upper is an active (according to SI data); however, there is a potentially deeper slip surface that may become active if the upper...

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