roadway over Landfill
roadway over Landfill
(OP)
Does anyone have any experience on designing/constructing roadway on top of landfill area. We are considering an asphalt pavement (8" thick 'no basis') knowing issue of maintenance.
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RE: roadway over Landfill
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
I'm pretty sure my DOT wouldn't accept this road into our system though. . .
f-d
¡papá gordo ain't no madre flaca!
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
You can also consider starting with a gravel driving surface for a few years and then adding asphalt when settlement and maintenance have (hopefully) started to decrease.
But I agree with the previous posts, your maintenance costs for this type of road will be relatively significant.
RE: roadway over Landfill
RE: roadway over Landfill
If you want a highly creative solution, retrofit the landfill for aerobic bacteriological processes - basically pump air through it and also recirculate lechant to keep the temperature low enough to prevent it from catching on fire. That should kickstart whatever remaining activity it's got left, and the whole thing could be inert in a few months. Then build over the inert landfill.
I was at Arcadis in the late 1990s when they did a pilot project that involved aerobic landfilling. I don't know if it ever caught on, but they were able to take a regular household trash landfill and turn the whole thing to dirt in a few months instead of what would normally have taken years.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
Anders Bjarngard published his thesis and it had to do with the settlement of municipal waste landfills. Just like soil, there is initial "modulus-based" settlement (after all the trash does have some modulus value and there will be some immediate compression). There is also settlement as related to change in void ratio in the absence of change in effective stress - i.e., secondary compression. You see usually we are not dealing with consolidation as the landfill materials are usually not saturated and if so the permeability of the trash is pretty high.
Anders Bjarngard looked at historical data from landfills all over the place and determined that secondary compression (C-alpha) is similar to that for soil - problem is that the value of C-alpha INCREASES over time to some value, "C-alpha-max." He provides graphed data and values for C-alpha and C-alpha-max. I used to (likely still do) have a copy of his thesis. If you google Anders Bjarngard you will find ASCE publications that you can purchase and I think these publications must cite his original work. They have interesting titles and may be great publications, but I'm not spending the money to further engage in this discussion. I am interested in what you find.
I'm not taking anything away from what's already been posted. The variation in C-alpha is related to decomposition rate and all those anaerobic processes. I'm not sure that unleashing aerobic processes in a landfill is the right or wrong thing to do. If the debris has been in place for 30 years and you consider the extent of compression that's likely occurred, the forecasted settlement (compression) using secondary compression values may be manageable in conjunction with a soil raft.
Face it, you are not doing "generally accepted" engineering practice and your client should recognize this risk before you sell yourself as some engineering expert.
f-d
¡papá gordo ain't no madre flaca!
RE: roadway over Landfill
RE: roadway over Landfill
RE: roadway over Landfill
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Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: roadway over Landfill
RE: roadway over Landfill
Working at a public landfill department Asphalt Concrete does alright unless major settlement occurs. Especially since Asphalt Concrete is flexible to a degree anyways.
At the department I work at we typically only use asphalt concrete for customer roads steeper than 9%. Anything less we typically use will a purely aggregate base road leading up to our wet weather pad. If the weather is nice and the soil is not muddy we send our traffic to our active dumping pad which only has dirt roads. If you do this make sure you have a rumble rack at the exit to the landfill so as to clean the customer tires before they exit the landfill less you want public roads getting track out on them.
RE: roadway over Landfill