Landfill
Landfill
(OP)
Hi, I am involved in a landfill closure project and just wondering what type of major geotechnical information/analysis may be required for this project.
The landfill is 5 m height with 1:2 slopes. So far, I am considering the following:
1. I expect that some kind of slope stability analysis will be required.
2. Also, I think that groundwater level information is important as well.
3. Check properties of soils underneath the landfill to address stability and settlement issues.
Any other items that I may need to consider?
The landfill is 5 m height with 1:2 slopes. So far, I am considering the following:
1. I expect that some kind of slope stability analysis will be required.
2. Also, I think that groundwater level information is important as well.
3. Check properties of soils underneath the landfill to address stability and settlement issues.
Any other items that I may need to consider?





RE: Landfill
That so called covering job was totally worthless. The moral to this story is that the cover must be capable of going through wet and dry seasons without cracking and allowing infiltration of rain water, etc. You may have to put up with a little leakage of the cover, but certainly you don't want it full of deep cracks.
RE: Landfill
settlement
drainage
leachate collection system
drainage
landfill gas collection system
oh, and drainage
RE: Landfill
OG, how can we avoid cracking of covering materials? I think that you have to keep the moisture there (not let the cover to dry) otherwise cracks will appear. But not sure how can you keep the moisture...
cvg, yes, the designers are taking considerations about drainage, but not sure how much geotechnical input is needed for drainage design, as I think that drainage will be composed of man-made surface structures to divert the flow and no let it go thru the landfill soils...
RE: Landfill
This cover is not unlike the roofing material, in that it must survive weather and sun without leaking, and there really isn't much that works 100% forever. Ballistic vests and radial tires are typically multilayered constructs. So, maybe sort of layered structure with membrane roofing as one of the layers and some sort of aramid to minimize punctures?
TTFN (ta ta for now)
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RE: Landfill
For example, for a clay liner system, you'll have testing for the borrow source (i.e., the source of the clay) for x samples per day and per volume of material. At the site, you'll be limited to the size of the lifts (e.g., 9 inches placed with a maximum compaction size of 4 inches), the hydraulic conductivity (or permeability), dry density, etc. You'll have so many samples per lift.
RE: Landfill
RE: Landfill
Not sure what you mean by man made materials.
most of the landfill / cover failures I have seen were related to the following:
clay cover increases the runoff to almost 100%
landfill settles to the point that drainage channels no longer have adequate slope. they have low spots (belly's) that collect water and do not drain. these spots get saturated, the water does not drain adequately and goes over the side and then runs down the face of the landfill. this causes erosion which pipes and headcuts to the top of the landfill, exposing waste. landfill cover material is brought in and packed in the erosion gulley. the next big rain it happens again.
So I don't know if this is related to geotechnical input or if this is strictly the civil engineer's problem, but settlement of the cover material and impact on drainage is a huge issue.
RE: Landfill
RE: Landfill
One thing I thought was odd was the slope of your cap of 1:2. Typically, the side slopes are 3 horizontal to 1 vertical. I've seen some a little steeper, but never 1 horizontal to 2 vertical. If that is your actual slope, you may have problems establishing vegetation on the cap as well as performing maintenance.
RE: Landfill