Slope Stabilization on cemented sediments

[foreng]

Has anyone had experience with stabilizing cemented sediments with natural slope angles above the estimated angle on internal friction? The soils are silty glaciolacustrine deposits bonded with calcium carbonate. The soils naturally occur at natural slopes up to 420 but when they are opened up become very unstable. The failure mechanism appears to be shallow translational type failures in the top 0.3-1.0 m due to a breakdown of the particle bond from freeze/ thaw and leaching on the calcium carbonate. Due to the steepness of these slopes, failure can progress 20-30 m up the slope. Walls at the base of the slope have been proposed but I’m looking for some less costly alternatives (i.e. bioengineering, drainage blankets, etc.). Any thoughts?

 

[foreng]

sahould of read: The soils naturally occur at natural slopes up to 42 degrees

 

[ishvaaag]

see p. 227 at following link

http://books.google.es/books?id=UyU...esult&ct=result&resnum=4#v=onepage&q=&f=false

http://books.google.es/books?id=wn0...sult&ct=result&resnum=10#v=onepage&q=&f=false

http://gsa.confex.com/gsa/2002NC/finalprogram/abstract_32705.htm

http://books.google.es/books?id=2vW...esult&ct=result&resnum=7#v=onepage&q=&f=false