Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is_________________?

Related Mcqs:

1. A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/ m2. If the effective stress is further increased from 200 kN/ m2 to 400 kN/ m2, then the settlement of the same clay is__________________?

   A. 10 mm
   B. 20 mm
   C. 40 mm
   D. none of the above

2. Degree of consolidation is________________?

   A. directly proportional to time and inversely proportional to drainage path
   B. directly proportional to time and inversely proportional to square of drainage path
   C. directly proportional to drainage path and inversely proportional to time
   D. directly proportional to square of drainage path and inversely proportional to time

3. Coefficient of consolidation for clays normally_______________?

   A. decreases with increase in liquid limit
   B. increases with increase in liquid limit
   C. first increases and then decreases with increase in liquid limit
   D. remains constant at all liquid limits

4. Coefficient of consolidation of a soil is affected by_______________?

   A. compressibility
   B. permeability
   C. both compressibility and permeability
   D. none of the above

5. Time factor for a clay layer is_______________?

   A. a dimensional parameter
   B. directly proportional to permeability of soil
   C. inversely proportional to drainage path
   D. independent of thickness of clay layer

6. Within the consolidation process of a saturated clay__________________?

   A. a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant
   B. a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
   C. both neutral pressure and effective pressure decrease
   D. both neutral pressure and effective pressure increase

7. The ultimate consolidation settlement of a soil is________________?

   A. directly proportional to the voids ratio
   B. directly proportional to the compression index
   C. inversely proportional to the compression index
   D. none of the above

8. The ultimate consolidation settlement of a structure resting on a soil_______________?

   A. decreases with the increase in the initial voids ratio
   B. decreases with the decrease in the plastic limit
   C. increases with the increase in the initial voids ratio
   D. increases with the decrease in the porosity of the soil

9. The most suitable method for drainage of fine grained cohesive soils is________________?

   A. well ppint system
   B. vacuum method
   C. deep well system
   D. electroosmosis method

10. In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as__________________?

    A. consolidated drained test
    B. consolidated undrained test
    C. unconsolidated drained test
    D. unconsolidated undrained test