Surchange required for low embankment ?
Surchange required for low embankment ?
(OP)
Hi guys, have a problem recently in relation to a low embankment (~2m in height) road construction on highly plastic soft peaty clay (3m thickness).
As the 2m fill will only induce less than 40Kpa on the existing road, and the allowable settlement is 20mm, is there a need to surcharge the peaty clay?
If settlement will be a problem, can we apply some treatment to the clay (say mixing with sand)?? Are there any other ways we can tackle this problem instead of surcharge the area? Or would it not be a problem at all without surcharge/treatment?
thanks guys...
As the 2m fill will only induce less than 40Kpa on the existing road, and the allowable settlement is 20mm, is there a need to surcharge the peaty clay?
If settlement will be a problem, can we apply some treatment to the clay (say mixing with sand)?? Are there any other ways we can tackle this problem instead of surcharge the area? Or would it not be a problem at all without surcharge/treatment?
thanks guys...





RE: Surchange required for low embankment ?
It would help this discussion to provide data on the soil layer (i.e., thickness, Atterberg limits, and consolidation terms) as well as the position of the water table. Then again, maybe all you have is SPT N-values and some moisture contents. . . .
f-d
¡papá gordo ain't no madre flaca!
RE: Surchange required for low embankment ?
We have two choices-You could remove all 3 m and replace with suitable soil as fill and compact it in place in thin lifts. Or you could remove all 3 m of peat and place an EPS product. EPS is made of similar materals as your coffee cup but is very light weight. See link below:
http://www.geofoam.com/applications.asp
You will need help from a geotechnical firm to limit differential settlement.
RE: Surchange required for low embankment ?
Again, you can design a surcharge to deal with this potential, which would be perfectly appropriate for road construction. I would not pre-determine the need to hog out all the peat just to construct the road.
Then again, you could. . .
f-d
¡papá gordo ain't no madre flaca!
RE: Surchange required for low embankment ?