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Vibro-replacement/stone column

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Hello,
 
I am reading a geotech report for a high school gym.  Masonry
bearing walls, and steel joists.  The report estimates
a liquefaction settlement of appox. 10 to 15 in.  The geotech
recommends using a deep pile/pier system, or a
ground improvement technique called vibro-replacement, or
stone columns.  The stone column idea appears to be a much
simpler approach as far as the building is concerned.
 
Has anybody had experience with this?  Pros? Cons?
Was it very expensive?
 
TIA.
Dan Goodrich, P.E.
Karren & Associates
3707 North Canyon Rd. Suite 8H
Provo, Utah 84604