Download JNTUA M.Tech 2nd Sem 2016 February 9D12101 Advanced Soil Mechanics Question Paper

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Code: 9D12101
M.Tech I Semester Regular & Supplementary Examinations February 2016
ADVANCED SOIL MECHANICS
(Geotechnical Engineering)
(For students admitted in 2011, 2012, 2013, 2014 and 2015 only)

Time: 3 hours Max Marks: 60

Answer any FIVE questions
All questions carry equal marks
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1 Explain the following:
(a) Diffused double layer.
(b) Isomorphous substitution.
(c) Specific surface.
(d) Soil fabric.

2 (a) Explain engineering properties of clay minerals in detail.
(b) What are the factors affecting permeability?

3 (a) What are the characteristics of flow net? Explain uses of flow net.
(b) What is the criterion for filter design?

4 Consolidated undrained test were conducted of a saturated clay soil given the following results:
Cell pressure (kN/m
2
) Deviator stress (kN/m
2
) Pore water pressure U(kN/m
2
)
150 102 80
300 200 164
450 304 264
600 405 325
Determine the effective stress strength parameters and by Mohr circle method and modified
strength envelop method.

5 (a) Write short notes on thixotropy.
(b) What are the different types of liquefaction? Explain mitigation methods to minimize the liquefaction.

6 Explain the shear strength of granular soils under plain strain condition. Give a simple correlation to
obtain friction angle.

7 (a) Explain consolidation by sand drains.
(b) What is the effect of secondary consolidation on preconsolidation pressure?

8 (a) What is shear strength? Draw the typical Mohr failure envelopes including Mohr circles from CD, CU
and UU tests conducted on both normally consolidated (loose) and over consolidated (dense) clays
in terms of total stresses and effective stresses.
(b) What is critical void ratio? Describe its significance.
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