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SPPU Civil Engineering (Semester 3)
Geotechnical Engineering
May 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any one question from Q1 and Q2
1 (a) Starting from first principles derive the following equations with usual nomenclature: $\gamma = \dfrac {G+eS_r)\gamma_\omega } { (1+e)$
6 M
1 (b) Explain with diagram a method for determining coefficient of permeability 'K' for clayey soils in the laboratory.
6 M

2 (a) On a single graph paper, draw neat labelled graphs for:
iv) Show on the same graph zones of clay size slit size, sand and gravel clearly.
6 M
2 (b) State the applications of flownet and explain how seepage through a dam can be determined using flow net. (State the equation and terms involved in it).
6 M

Answer any one question from Q3 and Q4
3 (a) Write a note on Vane Shear Test with neat sketch and the formulae involved.
6 M
3 (b) A load 1000 kN acts as a point load at the surface of a soil mass. Estimate the stress at a point 3m below and 4m away from the point of action of the load by Boussineq's formula. Compare the value with the result from Westergaard's theory.
6 M

4 (a) Draw a curve showing the relationship between dry density and moisture content for Standard Protector test and indicate the salient features of the curve.
6 M
4 (b) Define total and effective stress.
Determine the shear strength in terms of effective stress on a plane within a saturated soil mass at a poit where the total withn a saturated soil mass at a point where the total normal stress is 200 kN/m2 and the pore water pressure is 80 kN/m2. The effective stress shear strength parameters for the soil are c'=16 kN/m2 and ϕ'=39°.
6 M

Answer any one question from Q5 and Q6
5 (a) Describe Rehbann's construction for determination of earth pressure with neat sketch.
7 M
5 (b) Derive the expression for the active state of pressure at any point for a submerged cohesionless backfill along with pressure diagrams.
6 M

6 (a) Explain how surcharge will affect earth pressure for cohesionless and cohesive soils in active state with pressure diagrams.
7 M
6 (b) A smooth vertical wall retains a level surface with y=18 kN/m3, ϕ=30°, to a depth of 8m. Draw the lateral pressure diagram and compute the total active pressure in dry condition and when water table rises to the GL. Assume γsat=22 kN/m3.
6 M

7 (a) Write short notes on causes and remedial measures of Landslides.
7 M
7 (b) Explain controlling techniques for subsurface contamination.
6 M

8 (a) What is slope stability and how are the different types of factor of safety determined?
7 M
8 (b) Discuss sources and types of ground contamination.
6 M

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