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Engineering · Civil Engineering
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Question 2 a) The following consolidation data was obtained from an undisturbed clay. This clay demonstrated a LL-85, a PL-38, p 2.7 Mg/m , and w-05.7%. Initially the specimen height was 2.54 cm and its volume was 77.14 cm. Plot the data as void ratio versus log pressure Evaluate the preconsolidation pressure and the Ce, Cr and Cs of the soil. How does Cr and C compare to one another? Stress Dial Reading Void Ratio 2.765 2.712 (kPa) 12.700 12.352 20 40 80 160 320 640 160 403.533 10 10 12.294 2.703 2.679 2.541 2.211 1.849 1.486 1.224 1.285 1.374 1.499 12.131 11.224 9.053 6.665 4.272 2.548 2.951 4.350 b) The deposit that the sample tested above was measured to be 7.8 m thick. It is to be loaded with a granular fill that is 3.2 m thick and demonstrates a total density of the fill is 1.8 Mg/m3. What consolidation settlement will take place due to the placement of the fill? c) If the coefficient of consolidation, cv is 1.7x104 cm2/s, how long would it take for consolidation to be completed assuming I way drainage? How long would it take for the base of the layer to achieve 60% consolidation? d)
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