Road construction on old landfill
Road construction on old landfill
(OP)
I'm in the process of designing a road part of which will be constructed over an old landfill. The landfill hasn't been used for 20+ years, there is about 16" of soil over the "fill" and the fill is about 10 feet deep.
This is not a road which will get constant traffic, it will serve as access to a boat launch area so loadings will be fairly "light" only the occasional service trucks.
Any suggestions, anyone done this before? If so, generally how was settlement accounted for? Utility trenching? This may seem like a geotechnical question, but I'm guess I'm looking for case study type responses.
This is not a road which will get constant traffic, it will serve as access to a boat launch area so loadings will be fairly "light" only the occasional service trucks.
Any suggestions, anyone done this before? If so, generally how was settlement accounted for? Utility trenching? This may seem like a geotechnical question, but I'm guess I'm looking for case study type responses.





RE: Road construction on old landfill
We found a similar site at a road-widening project for I-85. The engineers decided on "dynamic compaction". A crane comes and drops a big weight and stomps the ground down.
On your site, the easiest alternative is to treat it as a maintenance issue and repair the road as it settles. A gravel surface would probably be easiest to maintain. 20 years ago brings it into the time of plastic trash bags, acting like hermetically sealed baloons, so you cannot assume that settlement has already occurred. With an increased load, it will probably start to move.
Good luck,
pigdog
RE: Road construction on old landfill
RE: Road construction on old landfill
1. Use of geogrid under a rock sub-base.
2. Compaction grouting combined with deep dynamic compaction.
3. Use of "grout piles", sometimes called Vibro piles.
Of the three above, the geogrid is likely to be the most economical.
RE: Road construction on old landfill
RE: Road construction on old landfill
RE: Road construction on old landfill