Centrifuge Modelling of Two Civil-Environmental Problems
Research Problem 1: Frost heave and thaw induced settlement in silt and silty clay developing over a year have been modelled correctly using a geotechnical centrifuge with tests requiring less than a day. In these tests, freezing model tests in clay have been conducted. Experimental results indicate...
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| Format: | Text |
| Language: | English |
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2001
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| Online Access: | http://www.dtic.mil/docs/citations/ADA393596 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA393596 |
| Summary: | Research Problem 1: Frost heave and thaw induced settlement in silt and silty clay developing over a year have been modelled correctly using a geotechnical centrifuge with tests requiring less than a day. In these tests, freezing model tests in clay have been conducted. Experimental results indicate the following: freezing regime influences depth of freezing, magnitude of heave, and characteristics of the ice; specimen preparation affects heave only through its effect on water content; position of the phreatic surface has little effect on heave in saturated day; there appear to be scale effects, in terms of the nature of the ice formed in 35g (1:35 scale) models vs 55g (1 :55g) models. These characteristics differ from those for freezing in silt where smaller water content and greater permeability lead to greater depth of freezing and greater heave. Research Problem 2: Capping contaminated sediments with clean sediments has been used by the US Army to reduce the environmental impact of the contaminated sediments. Preliminary tests to assess the possibility of contaminant breakthrough occurring through the clean sediment cap are complete. The use of rapid centrifuge model tests to model long term effects in the field was considered. |
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