1 (a)
With the help of three phase diagram, define the terms Bulk density, Dry density, void ratio and Water content.

8 M

1 (b)
With usual notations prove that Se=WG.

6 M

1 (c)
A soil sample weighing 19 kN/m

^{3}has a water content of 30%. The specific gravity of soil particles is 2.68. Determine void ratio, porosity and degree of saturation.
6 M

2 (a)
What is consistency of soil? List and define consistency limits.

6 M

2 (b)
Briefly explain the correction to be applied to a hydrometer reading.

6 M

2 (c)
Following results were obtained from liquid limit test on a clay sample, whose plastic limit is 20%.

Plot the curve and obtain; i) Liquid limit ii) Plasticity index iii) Flow index

Plot the curve and obtain; i) Liquid limit ii) Plasticity index iii) Flow index

Number of blows |
12 | 18 | 22 | 34 |

Water content in % |
56 | 52 | 50 | 45 |

8 M

3 (a)
Explain soil classification according to IS classification system.

8 M

3 (b)
Explain any two field tests to identify silts from clays.

4 M

3 (c)
With neat figures, explain the structures of three clay minerals.

8 M

4 (a)
List of various factors affecting permeability of soils.

6 M

4 (b)
Explain quick sand and capillary phenomena.

6 M

4 (c)
In a falling head permeability test on a silty clay sample, the following results were obtained Length of sample =12cm; Diameter of sample=8cm; Diameter of stand pipe=0.4cm, Initial head of water in stand pipe=120cm; Final head of water in stand pipe=40cm, Time of fall in head =6 minutes. Find the coefficient of permeability of the soil.

8 M

5 (a)
Explain Mohr-Coulomb theory.

6 M

5 (b)
Explain Sensitivity and Thixotropy of clay.

6 M

5 (c)
The result of shear box test are as follows:

Determine shear parameters, Would the failures occur on the plane within the soil mass when the shear stress in 122 kN/m

Determine shear parameters, Would the failures occur on the plane within the soil mass when the shear stress in 122 kN/m

^{2}and normal stress is 246 kN/m^{2}?
Normal Stress (kN/m^{2}) |
50 | 100 | 200 | 300 |

Shear stress (kN/m^{2}) |
36 | 80 | 154 | 235 |

8 M

6 (a)
Write the differences between standard and modified proctor compaction test.

6 M

6 (b)
Briefly explain factors affecting compaction.

6 M

6 (c)
The following data were obtained from standard proctor compaction test:-

i) Plot the compaction and determine MDD and OMC.

ii) Draw zero-Gr. void line.

iii) Also determine saturation at MDD. Take G=2.6.

i) Plot the compaction and determine MDD and OMC.

ii) Draw zero-Gr. void line.

iii) Also determine saturation at MDD. Take G=2.6.

Water content (%) |
9 | 11 | 13 | 15 | 16 | 17 | 18 |

Bulk unit weight (kN/m^{3}) |
18 | 19 | 19.9 | 20.8 | 21 | 20.5 | 20.1 |

8 M

7 (a)
Explain Mass-spring analogy.

6 M

7 (b)
With neat sketch, explain how pre-consolidation pressure is determined by Casagrande's method.

6 M

7 (c)
A soil sample 20mm thick takes 20minutes to reach 20% consolidation. Find the time taken for a clay 6m thick to reach 40% consolidation. Assume double drainage in both cases.

8 M

8 (a)
What are the advantages and limitations of vane shear test? How do you conduct the test in laboratory?

8 M

8 (b)
Explain square root of time fitting method for determination of coefficient of consolidation.

6 M

8 (c)
With neat sketch, explain vane shear test.

6 M

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