1 (a)
With a neat sketch of a sample, define

i) Area ratio

ii) Inside clearance

iii) Outside clearance

Also indicate recommended values.

i) Area ratio

ii) Inside clearance

iii) Outside clearance

Also indicate recommended values.

6 M

1 (b)
List and explain different types of samplers used in soil sampling.

8 M

1 (c)
List the methods used for controlling ground water during excavation. Explain any one of these dewatering methods.

6 M

2 (a)
List the assumptions made in Boussineq's and westergaards theories.

6 M

2 (b)
Explain the: i) Pressure bulb;

ii) Pressure distribution on horizontal plane: iii) Pressure distribution on vertical plane.

ii) Pressure distribution on horizontal plane: iii) Pressure distribution on vertical plane.

8 M

2 (c)
A point load of 1000kN acts at the ground surface. Compute the vertical stresses at 8m depth.

i) On the axis of the load;

ii) 2m away from the axis.

Use Boussineq's equations.

i) On the axis of the load;

ii) 2m away from the axis.

Use Boussineq's equations.

6 M

3 (a)
What is flow net? What are its characteristics and uses?

8 M

3 (b)
Explain with a neat sketch the method of locating phreatic line for a homogeneous earth dam without filter.

8 M

3 (c)
Explain the terms:

i) Exit gradient

ii) Piping failure

i) Exit gradient

ii) Piping failure

4 M

4 (a)
List the assumptions and limitations of Rankine's Earth Pressure Theory.

4 M

4 (b)
Explain the Culman's graphical construction for determination of active earth thrust.

8 M

4 (c)
A retaining wall, 7.5m high retains cohesionless, horizontal back fill. The top 3m of fill has a unit weight of 18 kN/m

^{3}and ϕ30° and the rest has a unit weight of 24kN/m^{2}and ϕ=20°. Determine using Rankine's theory, the distribution of active earth pressure and total active earth thrust.
8 M

5 (a)
What are different types of slopes? Explain types of slope failures. What are the causes of slope failure?

6 M

5 (b)
Explain the methods of slices for stability analysis of sloper.

8 M

5 (c)
An embankment is to be constructed with C=30 kN/m

^{2}, ϕ=207deg;, r=18kN/m^{3}, FS=2 and height 10m. Estimate the required side slope using Taylor's stability number.
6 M

6 (a)
Explain the different modes of shear failure with the help of neat sketch.

6 M

6 (b)
What are the assumptions made in Terzaghi's theory? Write the expressions for ultimate bearings capacity of strip footing, square and circular footing.

6 M

6 (c)
A strip footing 1.2m wide is supported on a soil with its base at a depth of 1m below ground surface. The soil properties are C=15 kN/m

i) at great depth

ii) at the level of footing

iii) at ground surface, Take, N

^{2}; ϕ=28°, γ'=10 kN/m^{3}. Determine the ultimate bearing capacity if water table is:i) at great depth

ii) at the level of footing

iii) at ground surface, Take, N

_{c}=32.36, N_{t}=18.58 and N_{r}=15.7. Use Terzaghi's theory.
8 M

7 (a)
Explain i) Immediate settlements ii) Primary consolidation settlements and iii) Secondary consolidation settlements.

6 M

7 (b)
Estimate the immediate settlement of a footing of size 2m×3m resting at a depth of 1.5m in a sandy soil whose compression modulus is 10N/mm

^{2}. Footing transmits a pressure of 200kN/m^{2}. Take μ=0.3 and influence factor as 1.06.
6 M

7 (c)
The following results were obtained from a plate load test conducted on dry sand stratum using a square plate of size 0.3m

Determine the settlement of square footing or width 1.5m, under a load intensity of 120 kN/m

Determine the settlement of square footing or width 1.5m, under a load intensity of 120 kN/m

^{2}.
8 M

8 (a)
Explain the factors influencing the selection of depth of a foundation.

6 M

8 (b)
Write a note on selection of foundation based on soil stratification and load carried.

8 M

8 (c)
Explain the classification of pile foundation.

6 M

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