A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of

The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5 m, specific gravity 2.67 and voids ratio 0.67 is equal to

A. 1.0m

B. 1.5m

C. 2.0m

D. 3m

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 $$\frac{{{\text{Cv}}}}{2}$$ to achieve the same degree of consolidation is

A. 3 months

B. 6 months

C. 12 months

D. 24 months

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

Select the correct range of density index, 1_D

A. 1_D > 0

B. 1_D ≥ 0

C. 0 < 1_D < 1

D. 0 ≤ 1_D ≤ 1