Question A2 15 Marks A Figure Qa 2 Shows A True Cross Section Through A Sheet Piled Excavation In A Soil Of Permeabil 1 (74.69 KiB) Viewed 29 times
Question A2 15 Marks A Figure Qa 2 Shows A True Cross Section Through A Sheet Piled Excavation In A Soil Of Permeabil 2 (65.31 KiB) Viewed 29 times
QUESTION A2 (15 marks) a) Figure QA.2 shows a true cross-section through a sheet-piled excavation in a soil of permeability k = 4 x 106 m/s. The soil is overlain by 4 m of highly permeable gravels, and the natural groundwater level is 2 m below the gravel surface. (i) Draw a flownet for seepage on Figure QA.2, which must be handed in with your answer book. (4 marks) By means of a flownet sketched on a suitably-modified cross-section estimate: (4 marks) (ii) the minimum capacity required of the dewatering system, and (iii) the pore water pressure at the point A. (4 marks) (iv) Comment briefly on the stability of the base of the excavation. (3 marks)
Figure QA.2 4m GWL 30 m 12m 12m 10m Bedrock, k = 10-10 m/s 0 10m Scale A 30 m 12m 12m 15m Flood plain gravels, k= 10-² m/s 2m E GWL P Soil, k = 4 x 10 m/s 12
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