Adding 15ft of soil above swamp?
Adding 15ft of soil above swamp?
(OP)
A 10 acre project needs the ground lifted 15ft. The existing site is swampy and directly adjacent to a lagoon. How do I know if (and how deep) the existing swampy soil needs to be cut and filled in order to have a stable surface to add the 15ft? The 10 acre site will hold a small power plant. This is for a very preliminary estimate. From my name you can tell I'm structural and this is way outside my wheelhouse.





RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
That is a lot of dirt.
RE: Adding 15ft of soil above swamp?
If you have information from another project that is located in the same area, that information would be very helpful.
For a power plant, you may be looking at a pile foundation.
RE: Adding 15ft of soil above swamp?
We recently constructed an interchange on "soft" soils. The geotechnical report estimated consolidation of 12-inches (90-days) which did occur.
RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
Mike McCann, PE, SE (WA)
RE: Adding 15ft of soil above swamp?
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
The geotechnical, environmental, permitting, and flooding issues from this project description are so tremendous it makes me think the OP isn't in the United States. But then he goes and measures his area in acres.
I will be interested to see how this thread develops.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
If - It's in the description - "swampy soil" is by definition swampy and therefore not able to support even your foot pressure without sinking so it will need something doing to it
How deep - ~Get a survey. Could be anything from 3 ft to 15 ft. Anything more and you would probably pile it or raft it as the cost is too high. The Victorians knew how to do it - http://www.engineering-timelines.com/scripts/engin...
As said the real issue is not the technical one - its environmental and planning (it was a bit easier in 1820's...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Adding 15ft of soil above swamp?
why isn't there a qualified civil or geotechnical engineer in charge of the site grading and foundation design?
RE: Adding 15ft of soil above swamp?
Mike McCann, PE, SE (WA)
RE: Adding 15ft of soil above swamp?
That's almost 250,000 cubic yards of fill material, placed as engineered fill...that will take months. Assuming you can compact 1000 sf of soil per hour per lift, you have about 7,000 hours of compaction. That would be almost 4 compactors working full time for a year. Must be a government project.
RE: Adding 15ft of soil above swamp?
wetlands i've mucked out have all been the 3 to 4 feet variety. if i had to pick something on a very prelim level, i would go with 4'. for that size an area, you should discuss with the future Geotech about surcharging and settlement monitoring because there will likely be time and materials to do it.
RE: Adding 15ft of soil above swamp?
Mike McCann, PE, SE (WA)
RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
RE: Adding 15ft of soil above swamp?
Mike McCann, PE, SE (WA)
RE: Adding 15ft of soil above swamp?
Yah..., get back to work. The next thing we know, you’ll be changing your name to Peat Boggs, so that this looks like legit work when the boss walks up behind you.
RE: Adding 15ft of soil above swamp?
Mike McCann, PE, SE (WA)