Analytical Chem Soil HW Solutions 29

Analytical Chem Soil HW Solutions 29 - QUESTIONS AND...

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29 QUESTIONS AND SOLUTIONS: CHAPTER 3 Laboratory measurement of permeability; fluidization; layered soils Q3.1 Describe by means of an annotated diagram the principal features of a constant head permeameter. Give three reasons why this laboratory test might not lead to an accurate determination of the effective permeability of a large volume of soil in the ground. Suggest how each of these problems might be overcome. [University of London 2nd year BEng (Civil Engineering) examination, Queen Mary and Westfield College (part question)] Q3.1 Solution Diagram of constant head permeameter: see main text Figure 3.8 Inaccurate determination of the in situ permeability might result from a) sample disturbance – unrepresentative void ratio of a uniform soil b) sample disturbance – destruction of soil fabric e.g. in a soil with a layered structure c) large scale inhomogeneities e.g. fissures and high permeability lenses, which cannot be represented in the small scale laboratory sample d) low permeability of a soil with fine particles leads to inaccurate determination of
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This note was uploaded on 12/28/2011 for the course CHM 4302 taught by Professor Stuartchalk during the Fall '11 term at UNF.

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