Quiz-04-Solution-Summer10

# Quiz-04-Solution-Summer10 - 2.65 0.121 2.65 9.81 1 2.65 61...

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FLORIDA INTERNATIONAL UNIVERSITY Department of Civil and Environmental Engineering CEG-4011 Geotechnical Engineering – I Summer Term “C” - 2010 QUIZ No. 4 Name _________ SOLUTION _________ ________________________29 June 2010 (2 points) What are the four forms of water associated with clays? a) “Free” or random water; b) Hydrogen bonding within the diffuse double layer; c) Dipole sharing within the diffuse double layer; d) Binding with a cation within the diffuse double layer. (4 points) Find the degree of saturation of a road base if the laboratory testing of the fill material yielded the following results of moisture and unit weight in kN/m 3 . w 7.1% 9.0% 10.9% 12.1% 13.3% γ 15.5 17.3 18.1 19.1 19.2 γ d 14.5 15.9 16.3 17.0 17.0 ( 29 ( 29 ( 29 ( 29 ( 29 1 1 1 1 Assume a value for
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Unformatted text preview: 2.65 0.121 2.65 9.81 1 2.65 61% 17.0 s w s s w d s d s G wG G w w wG S S G S S γ = + = + ∴ + = + = + = ∴ = (4 points) The five soil parameters shown below belong to a soil sample. Determine which of these five soil parameters is incorrect. a) γ s = 124.8 pcf, (b) γ = 115 pcf, (c) w = 32%, (d) S = 80%, (e) e = 0.80 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 3 Try 1) 0.80 0.80 0.64 124.8 2) 0.32 0.64 62.4 Therefore, these four parameters are correct. Let us now try , 1 1 1.32 124.8 91.5 / 115 1 1 1.80 Theref s S S w S Se wG Se wG w G w kN m e e = = = = = + + = = = = ≠ + + ore, the unit weight is in error....
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