Subgrade Stabilization
Subgrade Stabilization
(OP)
I am looking to find a way to stabilize a soft subgrade for a large retail store parking lot. The site soil consists of saturated silty clay. Proof rolling indicates rut depths of about 4" in most places. What would be an appropriate fix for this? I was thinking several options.
1. Undercut 1 foot, backfill with 12" of sand. I figure I might need to go to something more like 16" of undercut and sand backfill with underdrains.
2. Stabilize the upper 12" with lime.
Any input would be much appreciated. Thank you.
1. Undercut 1 foot, backfill with 12" of sand. I figure I might need to go to something more like 16" of undercut and sand backfill with underdrains.
2. Stabilize the upper 12" with lime.
Any input would be much appreciated. Thank you.





RE: Subgrade Stabilization
RE: Subgrade Stabilization
RE: Subgrade Stabilization
RE: Subgrade Stabilization
Is this a case of saturated clay by virtue of the water table or is this a perched water condition?
f-d
¡papá gordo ain’t no madre flaca!
RE: Subgrade Stabilization
RE: Subgrade Stabilization
f-d
¡papá gordo ain’t no madre flaca!
RE: Subgrade Stabilization
If groundwater is over 4 to 5 feet below the finished grade, it is likely capillary rise causing the high moisture condition and you would need to break the capillary rise. Lime and/or overexcavation and backfilling with a compacted graded stone layer will work for this.
RE: Subgrade Stabilization
RE: Subgrade Stabilization