Questions and Answers of Consolidation Problems in Soil Mechanics for Civil Engineering.

**What would be the time to consolidate 50% with single drainage, if the clay sample in the laboratory test has 24mm thickness and it is tested with the single drainage and consolidated 50%. The clay layer from which the sample was obtained is 4m thick?**

(A). 386 days

(B). 390 days

(C). 404 days

(D). 175 days

(E). None of these

Multiple Choice Question Answer: a

**What would be the height of solids Hs, for the dry soil mass of 180.4 g, specific gravity 2.68, and cross-sectional area of the specimen as 50 cm2?**

(A). 13.45 mm

(B). 14 mm

(C). 17 mm

(D). 19.5 mm

(E). None of these

Multiple Choice Question Answer: a

**What would be the compression index, if the initial voids ratio is 1.08?**

(A). 0.524

(B). 0.243

(C). 0.728

(D). 0.871

(E). None of these

Multiple Choice Question Answer: b

**What would be the hydraulic head, if the excess hydraulic pressure is 19.62 KN/m2?**

(A). 2m

(B). 4m

(C). 8m

(D). 16m

(E). None of these

Multiple Choice Question Answer: a

**What would be the hydrostatic pressure of water at depth of 10m?**

(A). 98.1KN/m2

(B). 54. 1KN/m2

(C). 32. 1KN/m2

(D). 43. 1KN/m2

(E). None of these

Multiple Choice Question Answer: a

**What would be the time to consolidate 50% with double drainage, if the clay sample in the laboratory test has 24mm thickness and It is tested with double drainage and consolidated 50%. The clay layer from which the sample was obtained is 4m thick?**

(A). 365 days

(B). 386 days

(C). 750 days

(D). 150 days

(E). None of these

Multiple Choice Question Answer: b

**What would be the time to consolidate 50% with single drainage, if the clay sample in the laboratory test has 24mm thickness and it is tested with the double drainage and consolidated 50%. The clay layer from which the sample was obtained is 4m thick? **

(A). 1544 days

(B). 1455 days

(C). 1322 days

(D). 1799 days

(E). None of these

Multiple Choice Question Answer: a

**What would be the final void ratio, if the final water content is 30% and specific gravity is 2.65 for a soil sample?**

(A). 0.900

(B). 0.795

(C). 0.667

(D). 0.549

(E). None of these

Multiple Choice Question Answer: b

**What would be the water content, if the final voids ratio is 0.864 for a soil sample of specific gravity 2.7?**

(A). 32%

(B). 48%

(C). 56%

(D). 62%

(E). None of these

Multiple Choice Question Answer: a

**What would be the coefficient of volume change, if a change in voids ratio is 0.18 and the initial void ratio is 0.68 with the increase of pressure as 200KN/m2?**

(A). 0.536 m2/MN

(B). 0.111 m2/MN

(C). 0.832 m2/MN

(D). 0.356 m2/MN

(E). None of these

Multiple Choice Question Answer: a

**What would be the coefficient of Compressibility, if the change in voids ratio is 0.18 and the initial void ratio is 0.68 with the increase of pressure as 200KN/m2?**

(A). 0.9 m2/MN

(B). 0.7 m2/MN

(C). 0.4 m2/MN

(D). 0.5 m2/MN

(E). None of these

Multiple Choice Question Answer: a

**What would be the change in effective pressure, if the coefficient of volume change is 0.291 m2/MN, ∆e=0.1 and the initial voids ratio is 0.72?**

(A). 200 KN/m2

(B). 50 KN/m2

(C). 300 KN/m2

(D). 00 KN/m2

(E). None of these

Multiple Choice Question Answer: a

**What would be the final Cross-sectional area of the specimen, if the height of solids Hs is 6.725mm, mass is 180.4g with specific gravity G=2.68?**

(A). 220 cm2

(B). 342 cm2

(C). 100 cm2

(D). 659 cm2

(E). None of these

Multiple Choice Question Answer: c

**What would be the change of voids ratio ∆e with respect to ∆H, if the final height of specimen Hf is 13.45mm and final voids is 0.864?**

(A). ∆e=0.139∆H

(B). ∆e=0.123∆H

(C). ∆e=0.178∆H

(D). ∆e=0.148∆H

(E). None of these

Multiple Choice Question Answer: a

**What would be the mv for soil B, if soil A has a coefficient of volume change as 0.536m2/MN and the ratio of the coefficient of volume change of A and B soils is 1.845? **

(A). 0.255 m2/MN

(B). 0.291 m2/MN

(C). 0.234 m2/MN

(D). 0.345 m2/MN

(E). None of these

Multiple Choice Question Answer: b

**What would be the change in effective pressure, If the soil sample is having a voids ratio 0.72 under a pressure of 200KN/m2. If the void ratio is reduced to 0.5 under 450kn/m2 load?**

(A). 4000 kN/m2

(B). 250 kN/m2

(C). 350 kN/m2

(D). 2000 kN/m2

(E). None of these

Multiple Choice Question Answer: b

**Because of an increment of a load of 100KN/ m2, If the height of the soil specimen is reduced from 0.28 cm to 1.926cm. What will be the coefficient of volume change?**

(A). 0.74m2/MN

(B). 0.98m2/MN

(C). 0.84m2/MN

(D). 0.67m2/MN

(E). None of these

Multiple Choice Question Answer: a

**What would be the settlement, for n soil of height 2.08cm, coefficient of volume change mv=0.74 m2/MN?**

(A). 0.154cm

(B). 0.342cm

(C). 0.432cm

(D). 0.455cm

(E). None of these

Multiple Choice Question Answer: a

**What would be the depth of the clay layer in the field, if the clay sample 24mm thick takes 20 minutes to consolidate 50% with single drainage? The field clay layer from which the sample was obtained takes 386 days to consolidate 50% with double drainage?**

(A). 800cm

(B). 500cm

(C). 600cm

(D). 480cm

(E). None of these

Multiple Choice Question Answer: a

**What would be the initial void ratio, if mv for pressure range 100 to 200 KN/m2 is 0.74 m2 /MN. The change in void ratio is 0.157?**

(A). 2.456

(B). 5.645

(C). 1.121

(D). 8.553

(E). None of these

Multiple Choice Question Answer: c

**What would be the elapsed time in which 10% of the ultimate settlement will occur for a foundation if the coefficient of consolidation is 4*10-4cm2/s. The average drainage path is 50cm.**

(A). 19.9 hours

(B). 15.5 hours

(C). 13.9 hours

(D). 17.5 hours

(E). None of these

Multiple Choice Question Answer: c

**What would be the degree of consolidation, if a clay layer is expected to settle 12cm under loading settles 3cm at the end of one month?**

(A). 25%

(B). 50%

(C). 60%

(D). 56%

(E). None of these

Multiple Choice Question Answer: a

**What would be the settlement, if the initial voids ratio is 0.964 for a layer of height 100cm. It is located with 200KN/m2 and the void ratio becomes 0.822?**

(A). 8.54 cm

(B). 7.43 cm

(C). 7.22 cm

(D). 8.44 cm

(E). None of these

Multiple Choice Question Answer: c

**What would be the time factor for the consolidation of 50%?**

(A). 0.197

(B). 0.564

(C). 0.253

(D). 0.826

(E). None of these

Multiple Choice Question Answer: a

**What would be the time factor for the consolidation of 90%?**

(A). 0.898

(B). 0.848

(C). 0.976

(D). 0.934

(E). None of these

Multiple Choice Question Answer: b

**What would be the degree of consolidation for a time factor Tv of 0.159?**

(A). 45%

(B). 98%

(C). 34%

(D). 18%

(E). None of these

Multiple Choice Question Answer: a

**What would be the degree of consolidation for a time factor Tv of 0.567?**

(A). 37%

(B). 60%

(C). 80%

(D). 95%

(E). None of these

Multiple Choice Question Answer: c

**What would be the specific gravity of soil for the dry mass of soil of 180.4g and height of solids as 13.45mm with the cross-sectional area as 50cm2?**

(A). 2.68

(B). 8.33

(C). 1.64

(D). 5.32

(E). None of these

Multiple Choice Question Answer: a

**What would be the specific gravity for the final void ratio of 0.886 and water content of 30%? **

(A). 4.68

(B). 2.68

(C). 1.45

(D). 2.45

(E). None of these

Multiple Choice Question Answer: b

**What would be the saturated unit weight for the mass of 3.192g of the soil with a voids ratio of 0.532?**

(A). 20.44 KN/m3

(B). 76.22

(C). 23.55

(D). 50.43

(E). None of these

Multiple Choice Question Answer: a

**What would be the compression index for the remolded sample of the clay with a liquid limit of 45%?**

(A). 0.753

(B). 0.561

(C). 0.493

(D). 0.245

(E). None of these

Multiple Choice Question Answer: d

**What would be the value of compression index, if the liquid limit is 50% for an ordinary clay of the medium sensitivity?**

(A). 0.36

(B). 0.45

(C). 0.12

(D). 0.64

(E). None of these

Multiple Choice Question Answer: a

**What would be the ratio of coefficients of consolidation, if two clay layer of A and B of thickness 2cm and 3 cm is load with the pressure of 200KN/m2 and the time taken by soil A to reach 50% consolidation is 1/4th of that required by soil B to reach 50% consolidation?**

(A). 2.4432

(B). 1.7778

(C). 4.3312

(D). 5.3489

(E). None of these

Multiple Choice Question Answer: b

**What would be the ratio of coefficients of Permeability, if two clay layer of A and B of thickness 2cm and 3 cm is load with the pressure of 200KN/m2 and time taken by soil A to reach 50% consolidation is 1/4th of that required by soil B to reach 50% consolidation. Given that ratio of coefficient of volume change is 1.751.**

(A). 5.234

(B). 2.456

(C). 3.114

(D). 4.233

(E). None of these

Multiple Choice Question Answer: c

**What would be the depth of the clay layer in the field, if the clay sample 24mm thick takes 20 minutes to consolidate 50% with double drainage? The field clay layer from which the sample was obtained takes 386 days to consolidate 50% with double drainage?**

(A). 4m

(B). 7m

(C). 3m

(D). 2m

(E). None of these

Multiple Choice Question Answer: a

**What would be the depth of the clay layer in the field, if the clay sample 24mm thick takes 20 minutes to consolidate 50% with double drainage? The field clay layer from which the sample was obtained takes 386 days to consolidate 50% with single drainage?**

(A). 5m

(B). 2m

(C). 22m

(D). 16m

(E). None of these

Multiple Choice Question Answer: b

**What would be the depth of the clay layer in the field, if the clay sample 24mm thick takes 20 minutes to consolidate 50% with single drainage? The field clay layer from which the sample was obtained takes 386 days to consolidate 50% with single drainage?**

(A). 200cm

(B). 367cm

(C). 400cm

(D). 569cm

(E). None of these

Multiple Choice Question Answer: c

**What would be the elapsed time in which 90% of the ultimate settlement will occur? for the foundation, if the coefficient of consolidation is 4*10-4cm2/s. The average drainage path is 50cm.**

(A). 56.38 days

(B). 43.78 days

(C). 61.34 days

(D). 78.23 days

(E). None of these

Multiple Choice Question Answer: c

**What would be the void ratio of specimen height H is 24mm and height of solids Hs is 13.45mm? **

(A). 0.786

(B). 0.432

(C). 2

(D). 34

(E). None of these

Multiple Choice Question Answer: a

**What would be the time to consolidate 50% with single drainage, if clay sample in laboratory test has 24mm thickness and It is tested with the single drainage and consolidated 50%. Clay layer from which sample was obtained is 4m thick?**

(A). 44 days

(B). 55 days

(C). 97 days

(D). 107 days

(E). None of these

Multiple Choice Question Answer: c

**What would be the coefficient of compressibility, if the change in the void ratio is 0.18 and the change in effective pressure is 100KN/m2?**

(A). 2.5×10-3 m2/kN

(B). 2×10-3 m2/kN

(C). 9×10-3 m2/kN

(D). 9.5×10-3 m2/kN

(E). None of these

Multiple Choice Question Answer: b