Pore Pressure Parameters

Q. A and B are Skempton's pore pressure coefficients. For saturated normally consolidated soils,

1. $A>1$ and $B>1$
2. $A>1$ and $B<1$
3. $A<1$ and $B>1$
4. $A<1$ and $B=1$

Q. In a triaxial test, a soil sample was consolidation under a cell pressure of $700kN/m^2$ and a back pressure of $350kN/m^2$. There after with drainage not allowed, the cell pressure was raised to $800kN/m^2$ resulting in the increased pore water pressure reading of $445kN/m^2$. The axial load was then increased to give a deviator stress of $575kN/m^2$(while the cell pressure remained at $800kN/m^2$) and a pore pressure reading of $640kN/m^2$. The pore pressure coefficients A and B are respectively?

1. 0.95, 0.36
2. 0.45, 0.75
3. 0.75, 0.45
4. 0.36, 0.95

Q. In an unconsolidated undrained triaxial test, it is observed that an increase is cell pressure from 150 kPa to 250 kPa leads to a pore pressure increase of 80 kPa. It is further observed that, an increase of 50 kPa in deviatoric stress results in an increase of 25 kPa in the pore pressure. The value of Skempton's pore pressure parameter B is:

1. 0.5
2. 0.625
3. 0.8
4. 1.0

Q. Skempton's pore pressure coefficient 'B' is the function of :

1. Degree of saturation
2. Over consolidation ratio
3. Change in deviation stress
4. None of above

Q. Consider the following statements:
1. For a saturated soil, Skempton's B-parameter is nearly equal to unity.
2. For an undisturbed sensitive clay, the stress strain curve shows a peak.
3. Interlocking contributes significantly to the shearing strength in case of dense sand.
Which of these statements are correct?

1. $1,2$ and $3$
2. $1$ and $2$ only
3. $2$ and $3$ only
4. $1$ and $3$ only

Q. Match List-I (Investigator) with List-II (Equation) and select the correct answer using the codes given below the lists:

List - I	List - II
A. Skempton	1. $v=ki$
B. Coulomb	2. ${\sigma }_1=\sigma -u$
C. Stokes	3. $v=\frac{D^2({\gamma }_s-{\gamma }_w)}{18\eta }$
D. Terzaghi	4. $s=c+\sigma tan\Phi$
	5. $u=B[{\sigma }_3+A({\sigma }_1-{\sigma }_3\left)\right]$

Codes
$ABCD$

1. $4532$
2. $5432$
3. $4513$
4. $5423$

Q. Statement-I A curved, or. straight, line connecting the relevant stress points is called the stress path.
Statement-II : All the total stress paths and the effective stress paths for the drained tests are straight lines at a slope of $45°$.

1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) is false
4. Statement (I) is false but Statement (II) is true

Q. Consider the following statements:
Liquefaction is a phenomenon
1. observed in fine sands
2. associated with development of positive pore pressure
Which of these statements is/are correct?

1. $1$ Only
2. $2$ Only
3. Both $1$ and $2$
4. Neither $1$ nor $2$

Q. Liquefaction of foundation soil during an earthquake shall not be the reason for cracking of

1. only floors in the building
2. walls and roof in the building
3. beams and columns in the building
4. only balcony in the building

Q. Match List-I (Investigator) with List-II (Equation) and select the correct answer using the codes given below the lists:

List - I	List - II
A. Skempton	1. $v=ki$
B. Coulomb	2. ${\sigma }_1=\sigma -u$
C. Stokes	3. $v=\frac{D^2({\gamma }_s-{\gamma }_w)}{18\eta }$
D. Terzaghi	4. $s=c+\sigma tan\Phi$
	5. $u=B[{\sigma }_3+A({\sigma }_1-{\sigma }_3\left)\right]$

Codes
$ABCD$

1. $4532$
2. $5432$
3. $4513$
4. $5423$