STUPIDSID
1 (a)
Draw three phase diagram of soil and derive the relation
\[\gamma _{b}=\dfrac{\left ( G+e.Sr \right )\gamma _{w}}{1+e}\] The letters have usual meaning.
\[\gamma _{b}=\dfrac{\left ( G+e.Sr \right )\gamma _{w}}{1+e}\] The letters have usual meaning.
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1 (b)
Void ratio of a soil sample is 30 % . If max. and min. dry density of soil sample
are 2.0 gm/cc and 1.6 gm/cc respectively, calculate density index of soil. Specific gravity of soil is 2.5.
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2 (a)
Explain use of particle size distribution curve with meaning of D10 , D30 , D60
coefficient of uniformity - Cu and coefficient of curvature ? Cc .
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2 (b)
Explain consistency limits with graph.
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2 (c)
A test was carried out to determine liquid limit of a soil sample. Following
observations were recorded. Plot the flow curve and determine the liquid limit
and flow index of the soil
| Water Content % | 18 | 24 | 30 | 35 |
| No of blows -N | 55 | 35 | 20 | 12 |
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3 (a)
What are the purposes of soil classification? Explain IS method of soil
Classification.
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3 (b)
A sand layer of 6m thickness is lying over a clay stratum. The water table is 2m
below ground level. If bulk density of saturated sand is 18 kN/m3 , calculate
effective and pore pressure on the top of clay layer. Sp. Gravity G=2.60
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3 (c)
State Darcy's law of permeability and explain factors affecting permeability.
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3 (d)
A horizontal stratified deposit of three layers of soil having thickness of 4m, 3m
and 5m respectively. The coefficient of permeability of corresponding layer id
3.5 × 10-3 cm/s, 6.5 × 10-3 cm/s and 8 × 10-5 cm/s. Calculate the effective
equivalent coefficient of permeability of soil deposit in horizontal direction and
vertical direction.
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4 (a)
Explain standard proctor test to determine OMC and MDD of a soil in the
Laboratory.
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4 (b)
The max. dry density and optimum moisture content of a soil from standard
proctor test are 1.90 gm/cm 3 and 15% respectively. Calculate the water content
necessary to completely saturate the sample at its max. dry density, assuming
no change in volume. Sp. Gravity G = 2.68
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4 (c)
What is "shear strength" of soil ? Explain unconfined compression test in
Detail.
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4 (d)
In a drained consolidated triaxial test, a specimen of clay fails at a cell pressure of 60 kN/m2 . The effective shear parameters are C = 16 kN/m2 and ? = 22° Calculate the deviator stress.
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5 (a)
What is consolidation of soil mass ? Explain procedure for determining pre-
consolidation pressure with graph.
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5 (b)
A clay soil layer 7m thick is subjected to a pressure of 80 kN/m2 . If the layer
has double drainage and it undergoes 50 % consolidation in one year, calculate
the coefficient of consolidation. If coefficient of permeability is 0.08 m/year,
determine the settlement in one year. Take γw = 9.81 kN/m3
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Write a short note on
5 (c) 1)
Sensitivity of soil
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5 (c) 2)
Textural classification of soil
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Write a short note on
5 (d) 1)
Characteristics of flow net.
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5 (d) 2)
Quick sand condition
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