1 (a)
Discuss about the importance of sub-soil exploration program.

6 M

1 (b)
Explain the method of seismic refraction.

7 M

1 (c)
What are the methods available for dewatching? Explain any one method.

7 M

2 (a)
Derive the expressions for vertical stress and shear stress by using Boussineq's theory. Also compare this theory with Westergaard's theory.

8 M

2 (b)
Write a note on pressure distribution diagrams.

6 M

2 (c)
A load of 1000kN acts as a point load at the surface of a soil mass. Estimate the stress at a point 3m above and 4m away from the point of action of the load of Boussinesq's formula. Compare the value with the result from Westergaars's theory.

6 M

3 (a)
What are flows nets? Explain the characteristics of flownet with a neat sketch. What are their uses?

8 M

3 (b)
Explain Graphical method for drawing flow net.

6 M

3 (c)
For a homogeneous earth dam 32m high and 2m free board, a flow net was constructed with 4 flow channels. The number of potential drops was 20. The dam has a horizontal filter at the base near the toe. The coefficient of permeability of the soil was 9×10

^{-2}mm/s. Determine the anticipated seepage, if the length of the dam is 100m.
6 M

4 (a)
Define At rest, Active and Passive Earth pressures.

6 M

4 (b)
Explain Rankine's theory for calculating Active pressure in cohesion less soils for no surcharge.

6 M

4 (c)
A retaining wall with a smooth vertical back is 10m high and retains a 2-layers sand backfill with the following properties.

0 - 5m depth: C"=0, ϕ'=30°, r=18 kN/m

Below: C"=0, ϕ'=34°, r=20 kN/m

Show that active earth pressure distribution, assuming that the water table is well below the base of the wall.

0 - 5m depth: C"=0, ϕ'=30°, r=18 kN/m

^{3}Below: C"=0, ϕ'=34°, r=20 kN/m

^{3}Show that active earth pressure distribution, assuming that the water table is well below the base of the wall.

8 M

5 (a)
What are the causes for failure of slopes?

6 M

5 (b)
Discuss the Swedish method of slices for a cohesive frictional soil.

8 M

5 (c)
An embankment is inclines at an angles of 35° and its height is 15m. The angle of shearing resistance is 15° and the cohesion intercept is 200kN/m

^{2}. The unit weight of soil is 18.0 kN/m^{3}. If Taylor's stability number is 0.06, find the factor of safety with respect to cohesion.
6 M

6 (a)
Define safe bearing capacity, safe bearing pressure and allowable bearing pressure.

6 M

6 (b)
Write a note on standard penetration test and its corrections.

8 M

6 (c)
Calculate the ultimate bearing capacity of a 2m wide square footing resting on the ground surface of sand deposited with the following properties:

i) Unit weight 18.6 kN/m

i) Unit weight 18.6 kN/m

^{3}ii) Angle of internal friction 35°. Also calculate URG of same footing when it is placed at depth of 1m below the ground surface. Take N_{q}=41.4, N_{r}=42.2.
6 M

7 (a)
Write a note on settlement of footings.

10 M

7 (b)
A saturated clay 8m thick underlies a purposed new building. The existing overburden pressure at the centre of clay layer is 300 Kpa and load due to a new building increase the pressure by 200Kpa. The liquid limit of the soil is 75%. Water content of soil is 50%. GS= 2.7. Estimate consolidation settlement.

10 M

8 (a)
Explain the factors affecting the choice of foundation.

6 M

8 (b)
Discuss the proportion of isolated footing.

6 M

8 (c)
Write a note on classification of pile foundations.

8 M

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