Compressibility Parameters
Trending Questions
Q. In a consolidation test void ratio decreased from 0.80 to 0.70 when the load was changed from 40 kN/m2 to 80kN/m2. What is the compression index?
- 0.14
- 0.16
- 0.33
- 0.66
Q. The identical clay samples of the same size, designated as A and B are subjected to consolidation test under identical loading conditions. Drainage takes place through one face in sample A and through both the faces in sample B. 50% consolidation of sample A occurs in 10 minutes. The time required for 50% consolidation to occur in sample B will be
- 40 minutes
- 10 minutes
- 5 minutes
- 2.5 minutes
Q. If, instead of single drainage, the number of drainage faces is increased to two in responding soils, the rate of compression will be
- 4 times slower
- 2 times slower
- 4 times faster
- 2 times faster
Q. The void ratio-pressure diagram is shown below. What is the coefficient of compressibility.
- 0.5 m2/t
- 0.73 m2/t
- 0.20 m2/t
- 0.25 m2/t
Q. The virgin compression curve for a soil is shown in figure below. What is the compression index of the soil?
- 0.3
- 0.5
- 1.5
- 15
Q. The slope of the e-log σ curve for a soil mass gives
- coefficient of permeability, k
- coefficient of consolidation Cv
- compression index, Cc
- coefficient of volume compressibility, mv
Q. The e-p curve for a soil is shown in the figure below. The coefficient of compressibility in m2/kN of the soils is
- 4000
- 2000
- 2.5×104
- 1.25×10−4
Q. Consolidation test was conducted on two soils A and B respectively. The soil A is 1.5 times more compressible than soil B. The thickness of A was 2 times that of B. If the time required for 50% consolidation was three times longer for soil A than for soil B, the ratio of coefficient of permeability of A to that of B is ?
- 0.5
- 1
- 2
- 4
Q. The compression curve (void ratio, e vs, effective stress, σ′v) for a certain clayey soil is a straight line in a semi-logarithmic plot and it passes through the points (e = 1.2; σ′v=50kPa) and (e = 0.6; σ′v=800kPa). The compression index (up to two decimal places) of the soil is
- 0.5
Q. When a structural load is applied on a soil stratum, which of the following soil types will have the minimum settlement?
- Over-consolidated clay stratum
- Clayey silt stratum
- Normally consolidated clay stratum
- Sandy clay stratum
Q. Compression index developed by Casagrande is
- CV=0.009(LL+10%)
- CV=0.009(LL−10%)
- CV=0.009(LL+10%)
- CV=0.0009(LL+10%)
Q. 
The virgin compression curve with axes adopted as per convention in this regard for a clay soil is shown in the figure. The compression index of the soil is
The virgin compression curve with axes adopted as per convention in this regard for a clay soil is shown in the figure. The compression index of the soil is
- 0.25
- 0.50
- 1.00
- 1.25
Q. Consider the following statements:
- Immediate settlement takes place as soon as the load is placed.
- Secondary settlement is significant in the case of organic soil.
- Secondary settlement is estimated based on the 'void ratio versus time curve' for a particular load under consolidation test.
- 1 and 2
- 1, 2 and 3
- 2 and 3
- 1 and 3
Q. The virgin compression curve for a particular soil is shown in the below figure on the standard graphical format. The compression index of the soil is
- 0.3
- 0.4
- 0.5
- 0.6
Q. Match List-I (Term) with List-II (Definition) and select the correct answer using the codes given below the lists (where 'e' is void ratio, 'p' is effective vertical stress 'k' is permeability and γw is unit weight of water):
List-I
A. Compression index, Cc
B. Coefficient of volume change, mv
C. Coefficient of compressibility, av
D. Coefficient of consolidation, Cv
List-II
A B C D
List-I
A. Compression index, Cc
B. Coefficient of volume change, mv
C. Coefficient of compressibility, av
D. Coefficient of consolidation, Cv
List-II
- Slope of the e-p curve defined as Δe/Δp(1+e0)
- Slope of e-long p curve given by [−Δe/Δlog p]
- Term defined as k/(mvγw)
- Slope of the e-p curve defined as −Δe/Δp
A B C D
- 2 1 4 3
- 4 3 2 1
- 2 3 4 1
- 4 1 2 3
