Questions: 1. The coefficient of uniformity Cu of a soil is 10 and its coefficient of curvature Cc is 0.90. You would classify the soil as: a. Even-graded b. Medium-graded

c. Gap-graded 6. An oedometer sample had a final water content of 12.5 % and a specific gravity of 2.7. What was its final voids ratio? a. 0.338 b. 0.238 C. 1.338 100 9. In a falling head permeameter test the length of the sample is 120mm and its area is 4417.86 mm². The area of the standpipe is 132.73 mm². At the start of a test the water level in the standpipe was 410mm and fell to 185mm after 490s have elapsed. What is the permeability of the soil? a. 6.16*10-3 m/s b. 1.25*10-3 mm/s c. 5.85*10-3 mm/s ooo 16m 11. An embankment is to be constructed over a 2m thick sand layer, underlain by a 16m thick saturated soft clay layer, which is underlain by a sand layer. The embankment will trigger consolidation of the clay layer. For the clay cv-3.1 m²/year. How long will it take for 90% of the consolidation process to be completed? 0.848 d²=st== a. 19.8 years b. 70 years c. 17.5 years 3.1m 8 m 12.A uniformly distributed Toad of 100 kN/m² is applied on a clay layer. After one ū ₁s=100& year the average excess pore pressure is 40 kN/m². The average degree of consolidation of the clay at this time is: 22 a. 40% b. 60 % c. It cannot be determined based on the information given ū=, oni₂ BEng Civil Engineering -Soi Mechanics -May 2022 1:1. U= U = Uei- let. 100- /c 2 7. An oedometer sample had the following voids ratios: e=0.364 under an effective stress of 0 kPa, e=0.351 under an effective stress of 100 kPa and e=0.338 under an effective stress of 200 kPa. What is the coefficient of volume compressibility my of the soil in the range 100 - 200 kPa? a. 1.9 x 10-4 m²/kN b. 9.53 x 10-5 m²/kN c. 9.62 x 10-5 m²/kN 00