Analytical Chem Soil HW Solutions 9

Analytical Chem Soil HW Solutions 9 - ⇒ D 15f 6 mm (point...

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9 size ranges. To convert this to a percentage of the total sample, we must multiply by 121g and divide by 399g. Hence Size, μ m <2 2-10 10-60 % of pan sample 33 24 43 Size, m 2 10 60 % of pan sample smaller than this size 33 (33+24) = 57 (33+24+ 43)=100 % of total sample smaller than this size 10.0 17.3 33.0 The particle size distribution curve is plotted in Figure Q1.7 using the data shown in bold type. Reading from the PSD curve, the soil is approximately 10% clay, 20% silt, 60% sand and 10% fine gravel: this makes it a clayey, very silty SAND. Also reading from the curve, D 15s 0.007 mm, D 85s 1.2 mm Q1.7 SOLUTION The filter PSD curve is sketched on Figure Q1.7 according to the following rules. D 15f 5 × D 85s (main text Equation 1.18)
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Unformatted text preview: ⇒ D 15f 6 mm (point B on Figure Q1.7) • D 15f > 4 D 15s (main text Equation 1.19) D 15f > 0.028 mm (point A on Figure Q1.7) • D 5f ≥ 63 m (main text Equation 1.18; point C on Figure Q1.7) • D 10f ~ slot width = 3 mm (point D on Figure Q1.7) • D 60f ~3 D 10f (main text Equation 1.21) D 60f ~9 mm (point E on Figure Q1.7) Using a degree of judgement to account for the very wide range of particle size present in the natural soil, and recalling the advice given by Preene et al (2000) that in variable ground main text Equation 1.18 should be applied to the finest soil and main text Equation 1.19 to the coarsest, a suitable PSD curve for the filter is sketched in Figure Q1.7....
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This note was uploaded on 12/28/2011 for the course CHM 4302 taught by Professor Stuartchalk during the Fall '11 term at UNF.

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