1.a. Explain the role of Geotechnical engineer in civil engineeing practices.

1.b. Differentiate netween compaction and consolidation.

1.c. State the merits and demerits of Direct shear test.

1.d. Write short note on Quick Sand Condition.

2.a. Derive the relationship between unit weight, dry unit weight, Moisture Content

2.b. A soil sample is found to have the following Properties. Classify the soil according to I.S. Classification System. a) Passing 75 micron sieve = 10 % b) Passing 4.75 mm sieve = 70 % c) Uniformity Coefficient = 8 d) Coefficient of curvatures = 2.8 e) Plasticity index = 4

2.c. The plastic limit of a soil is 25% and its Plasticity index is 8%. When the soil is dried from its state at plastic limit, The volume change is 25% and its volume at Plastic limit. Similarly the corresponding volume change from the liquid limit to dry state is 34% of its Volume at Liquid Limit , Determine the shrinkage limit and shrinkage ratio.

3.a. In an Earthen embankment under Construction to bulk unit weight is 16.5 $\mathrm{kN} / \mathrm{m}^{3}$ at water content of 11%. If the water content is to be raised to 15%, compute the quantity of water required to be added per cubic meter of soil? Assume no change in the Void Ratio.

3.b. Define following a) Porosity b) Seepage Pressure c) Pore Pressure d) Liquidity Index e) Relative Density

3.c. Calculate the Horizontal and Vertical Permeabilities $10^{.5}, 10^{-7}$ and $10^{-9} \mathrm{m} / \mathrm{sec}$ respectively.

4.a. Explain the Factors affecting Compaction.

4.b. In site reclamation project, 2.5m of Graded fill $\left(\gamma=22 \mathrm{kN} / \mathrm{m}^{3}\right)$ were laid in compacted layers over an existing layer of silty clay $\left(\gamma=18 \mathrm{k} \mathrm{N} / \mathrm{m}^{3}\right)$ which was 3m thick. This was underlain by a 2m thick layer of gravel $\left(\gamma=20 \mathrm{kN} / \mathrm{m}^{3}\right)$ Assuming that the water table remains at the surface of the silty clay. Draw the effective stress profiles for case i) before the fill is placed and case ii) after the fll has been placed.

4.c. Discuss properties and application of Flow net.

5.a. An undrainedtriaxial Compression strength test was conducted on clayey slt soils, and the following test results are obtained.

Specimen No.	1	2	3
$\sigma_{3}\left(\mathrm{kN} / \mathrm{m}^{2}\right)$ Minor Principle Stress	17	44	56
$\sigma_{1}\left(\mathrm{k} \mathrm{N} / \mathrm{m}^{2}\right)$ Major Principle Stress	157	204	225
$\mathrm{u}\left(\mathrm{kN} / \mathrm{m}^{2}\right) \quad$ Pore Pressure	12	20	22

Determine the shear parameters considering effective stresses.

5.b. Explain Mohr-Coulomb Failure theory.

5.c. List out assumption made in Terzaghi's one dimensonal consolidation theory.

6.a. Discuss with sketch any one boring method used in soil exploration Programme.

6.b. Find the time reuired for 50% consolidation in a soil of 8m thick, if coefficient of consolidation is $1 \times 10^{-4} \mathrm{cm}^{2} / \mathrm{min}$

6.c. Write a note on Geosynthetics.