Seepage Pressure and Force

Q. Seepage force per unit volume can be expressed as

1. $i{\gamma }_{w}L$
2. iL
3. ${\gamma }_{w}h$
4. i${\gamma }_w$

Q. A soil has a discharge velocity of $6\times {10}^{-7}m/s$ and a void ratio of 0.5. Its seepage velocity is

1. $18\times {10}^{-7}m/s$
2. $12\times {10}^{-7}m/s$
3. $6\times {10}^{-7}m/s$
4. $3\times {10}^{-7}m/s$

Q.

What are the factors affecting the coefficient of permeability?

Q. Water is flowing through the permeability apparatus as shown in the figure. The coefficient of permeability of the soil is k m/s and the porosity of the soil sample is 0.50.

What are the discharge velocity and seepage velocity, respectively through the soil sample?

1. k, 2k
2. $\frac{2}{3}k,\frac{4}{3}k$
3. 2k, k
4. $\frac{4}{3}k,\frac{2}{3}k$

Q. A soil has discharge velocity of $5\times {10}^{-7}$ m/s and a void ratio of 0.50. Its seepage velocity will be

1. $15\times {10}^{-7}m/s$
2. $10\times {10}^{-7}m/s$
3. $20\times {10}^{-7}m/s$
4. $30\times {10}^{-7}m/s$

Q. At a point through cross section in a mass of saturated and homogenous soil, seeping water follows a path inclined at ${10}^{\circ }$ below to the horizontal. The hydraulic gradient is 0.5, void ratio and specific gravity of grains are 0.9 and 2.75 respectively. The resultant body force per unit volume of cylinder soil element is $({\gamma }_w=10kN/m^3)$

1. $10.5kN/m^3$
2. $13kN/m^3$
3. $11.213kN/m^3$
4. $9.21kN/m^3$

Q. Match List-I (Protective measure) with List-II (Purpose) and select the correct answer using the codes given below the lists:
List-I
A. Inverted filter
B. Riprap
C. Clay core
D. Sand columns
List-II
1. To protect river banks from erosion by river flow
2. To prevent escape of fine soils by seepage water
3. To reduce damage due to liquefaction of saturated granular soils during earthquakes
4. To reduce seepage of water through the body of the earth dams
Codes:
A B C D

1. 4 3 2 1
2. 2 3 4 1
3. 4 1 2 3
4. 2 1 4 3