Analytical Chem Soil HW Solutions 43

Analytical Chem Soil HW Solutions 43 - By scaling from the...

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43 Figure Q3.10 The flowrate q is calculated from q (m 3 /s per metre length) = k t .H.N F /N H where k t , the equivalent permeability of the transformed section, = (k v .k h ) (see main text Section 3.14); k t = 5 × 10 -5 m/s; H, the overall head drop = 9 m; N F , the number of flowtubes =3 × 2 for symmetry = 6; and N H , the number of equipotential drops, = 9 Hence metre s m m s m q / / 10 3 9 6 ) ( 9 ) / ( 10 5 3 4 5 × = × × × = or q = 0.3 litre/sec per metre length
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Unformatted text preview: By scaling from the diagram, the vertical hydraulic gradient between the sheet piles is ~ 1, so there is a danger of base instability (quicksand or boiling). The stability of the base could be ensured by increasing the depth of the sheet piles and/or by lowering the groundwater level inside the cofferdam to well below formation level....
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