Analytical Chem Soil HW Solutions 59

Analytical Chem Soil HW Solutions 59 - = z =10m 10 z dz z...

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59 + = = = m z z dz z z 10 0 4000 5000 10 ρ Let u = 5000 + 4000z then z = (u – 5000)/4000 and dz = du/4000, and ( ) 4000 . 400 / 5000 45000 5000 du u u = ρ = du u 45000 5000 16000 50 1600000 1 = 16000 ) ln( . 50 1600000 45000 5000 u u (settlement in metres) Thus ρ = (0.028 – 0.033) – (0.003 – 0.027) m = 0.019 m or ρ = 19 mm Q4.7 Figure 4.42 shows the ground conditions at the site of the Jubilee Line Extension station at Canary Wharf, in East London. During construction of the station, it was necessary to lower the groundwater level at the top of the Thanet Sands to 84m above site datum. (a) Assuming that the groundwater level in the Thames Gravels is unaffected, and that the groundwater level at the top of the Chalk is reduced by only 35kPa, construct a table for the
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