Figure QA.2 shows a true cross-section through a sheet-piled
excavation in a laminated soil 63
ofpenneability k = 2.0 x 10- mis. The unit weight of
soil is 20 kN/m •
(a) Draw a flownet for seepage on Figure QA.2, which must
be handed in with your
Yellow answer book.
(b) Estimate the minimum capacity required o f the
dewatering system.
(c) Estimate the pore water pressure at the point A.
(4 marks) (4 marks) (4 marks)
(d) Estimate the upward hydraulic gradient. Comment briefly on
the stability of the
Figure Qa 2 Shows A True Cross Section Through A Sheet Piled Excavation In A Laminated Soil 63 Ofpenneability K 2 0 X 1 (314.18 KiB) Viewed 48 times
2.00 m ZVA 3.00 m + TAV 3.00 m A 3.50 m Figure QA.2
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