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Q.2 (a) In order to determine whether or not the soil from a borrow area was suitable to be used as a Fill material for a retaining wall, particle size distribution (PSD) test was performed and the results were tabulated as below. Particle Size Mass Retained Particle Size (mm) Mass Retained (mm) 37.5 0 0.6 60.5 20 12.5 0.3 62.5 10 5 28.1 38.0 0.212 0.15 0.063 10.0 60.0 2 48.0 70.0 1.18 47.6 pan 1.0 (i) Calculate % of mass passing for each sieve and plot the PSD curve for the soil sample. (6 marks) (ii) Determine D10, D30 and 160, (3 marks) (iii)Determine Cu and Cc, (2 marks) (iv) Classify the soil according to the British Standard, and (2 marks) (v) Determine whether or not the soil can be used as a suitable fill material for the retaining wall if only well graded sand is required. Explain your answer. (1 mark)
63 pm 。 N BS sieve aperture size, mm 212 600 μη 150 300 4251 6.3 3.35 5 20 37.5 63 28 50 125 mm 1.18 mm 10 14 Percentage possing : ill I ol ! 0.002 0.006 0.02 0.06 0.2 2 6 20 60 200 0.6 Particle size mm