(b) An oil tank (20 m diameter, 10 m height) is to be built over the top surface of the site. From Geotechnical Investig

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B An Oil Tank 20 M Diameter 10 M Height Is To Be Built Over The Top Surface Of The Site From Geotechnical Investig 1 (67.74 KiB) Viewed 31 times

(b) An oil tank (20 m diameter, 10 m height) is to be built over the top surface of the site. From Geotechnical Investigation profile and laboratory tests, the following information are available: at 7 m from Ground Surface: Hard rock > at 4 m from the ground: 3 m thickness of clay stratum [G, = 2.7,w = 20%, 0,= 120 kPa, Cc = 0.2, C, = 0.04 ] > up to the ground: 4 m thickness of sand stratum [Ydry = 18 kN/m³, Ysat = 20 kN/m³ ]. at 1 m from the ground: a constant level of water table A specimen of clay from this site [20 mm thickness] double drained was to be tested in oedometer and time required to reach 60% degree of consolidation is 15 minutes. (i) Sketch the soil profile and includes all details (3.0 Marks} (ii) Calculate the average stress increase at depth of 0, 1, 4, 5.5 and 7 m under the centre and edge of the tank. Comment on the results. (8.0 Marks) after 1 year of (iii) Estimate the differential settlement (middle of clay layer) at the centre of the tank construction (6.5 Marks}