1. A compacted embankment is constructed to preload the foundation of an oil tank. The results...

 

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1. A compacted embankment is constructed to preload the foundation of an oil tank. The results of a consolidation test on a sample taken from the center of the clay layer (see figure below) are Cc = 0.35, Cr = 0.07, Cv 0.025 m/d, and o'zc=270 kPa. Assuming that the center point is representative of the whole clay layer: (a) Calculate the primary consolidation settlement of the clay layer under the centerline of the embankment. (b) How long (tr in month) would it take for the average excess porewater pressure to drop to 10% of its initial value (at this time, the embankment will be removed)? (c) Calculate the height of water in a wick drain installed at point A right after the construction of the embankment and at time tr. (d) Estimate the maximum heave of the clay layer after the removal of the embankment. (e) Determine the hydraulic conductivity of the clay layer for the loading range (before and after the placement of the surface load). 4m 5m Sand 10m Clay Sand 60 m [45 points] 1.5 10m 7 m emb = 1.5 = 20 kN/m Ya=16.5 kN/m =19.2 kN/m Y sar G = 2.65, e=1.05 1. A compacted embankment is constructed to preload the foundation of an oil tank. The results of a consolidation test on a sample taken from the center of the clay layer (see figure below) are Cc = 0.35, Cr = 0.07, Cv 0.025 m/d, and o'zc=270 kPa. Assuming that the center point is representative of the whole clay layer: (a) Calculate the primary consolidation settlement of the clay layer under the centerline of the embankment. (b) How long (tr in month) would it take for the average excess porewater pressure to drop to 10% of its initial value (at this time, the embankment will be removed)? (c) Calculate the height of water in a wick drain installed at point A right after the construction of the embankment and at time tr. (d) Estimate the maximum heave of the clay layer after the removal of the embankment. (e) Determine the hydraulic conductivity of the clay layer for the loading range (before and after the placement of the surface load). 4m 5m Sand 10m Clay Sand 60 m [45 points] 1.5 10m 7 m emb = 1.5 = 20 kN/m Ya=16.5 kN/m =19.2 kN/m Y sar G = 2.65, e=1.05