Enquirer

From: Vanessa Edafos
Date: 15th November 1999
Subject: Settlement in sites with high organic content (10-30%)

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Hello Micky

I need to find out how settlement can be estimated for sites with high organic content (10-30%) i.e. sites that have been used for garbage disposal for a certain time period.

Do you have any idea how I could go about finding a solution to this problem?

Kind Regards

Vanessa

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1st response

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Hello there Vanessa

I have forwarded your request on to a couple of mailing lists hosted at www.mailbase.ac.uk

1. Environmental Geology (geo-env)
2. Forum on Contamination in Land: (focil)
3. Geotechnical Engineering (engineering-geotech)
4. Unsaturated Soil (unsaturated-soil)

Their respective Websites (with archives of the past 12 months' messages) are at :-

1. www.mailbase.ac.uk/lists/geo-env/
2. www.mailbase.ac.uk/lists/focil/
3. www.mailbase.ac.uk/lists/engineering-geotech/
4. www.mailbase.ac.uk/lists/unsaturated-soil/

cheers

Micky

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2nd response

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Vanessa

I completed my Ph.D. thesis last December on landfill setlement and have done two papers so far. I performed lab tests with and without enhanced degradation to model the mechanical and degradation settlement.

If you want the papers, let me know and, if you want a copy of the thesis, try the University of Michigan microfilm service or request a copy from my advisor ()

cheers

Rensselaer Polytechnic Institute

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3rd response

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Vanessa

I've no doubt there is a lot of later work done, but some early references can be found in my paper Building on Landfill: A World Perspective (which is in PDF format)

This paper did not attempt to separate out

1. initial compression
2. consolidation (settlement occurring at a rate determined by the permeability of the soil skeleton as the water is squeezed out)
3. degradation of organic matter- which is normally the primary cause of long term settlement in domestic waste but not necessarily in landfills containing low organic matter

The organic matter value may give some guidance on the amount of degradation settlement, but the method of construction of the landfill (end tipped, placed in layers, compacted with trash compactor etc) will have a marked effect on the initial compression.

Studies of the use of dynamic compaction should provide further information on this area, but I am sorry I have no references to hand.

Then there are the time effects: degradation rates will vary significantly from many factors (this has been studied extensively from the viewpoint of assessing rate of methane generation).

Hope this helps.

EValue Engineering Sdn Bhd