Figure QA.2 shows a true cross-section through a sheet-piled excavation in a laminated soil of permeability k = 2.0 x 10

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Figure Qa 2 Shows A True Cross Section Through A Sheet Piled Excavation In A Laminated Soil Of Permeability K 2 0 X 10 1 (54.36 KiB) Viewed 15 times

Figure QA.2 shows a true cross-section through a sheet-piled excavation in a laminated soil of permeability k = 2.0 x 10-6 m/s. 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. (4 marks) (b) Estimate the minimum capacity required of the dewatering system. (4 marks) (c) Estimate the pore water pressure at the point A. (4 marks) (d) Estimate the upward hydraulic gradient. Comment briefly on the stability of the base of the excavation. (4 marks) (e) Suggest 2 methods to prevent piping to occur. (4 marks)
2.00 m A 3.00 m TAV 3.00 m + о А 3.50 m