This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)
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Code: 9D12101
M.Tech I Semester Regular & Supplementary Examinations January/February 2017
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ADVANCED SOIL MECHANICS
(Geotechnical Engineering)
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Time: 3 hours
Max. Marks: 60
Answer any FIVE questions
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All questions carry equal marks
1 Inorganic clay has a liquid limit of 350 percent.
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(a) What is the most probable predominant clay mineral in this soil?
(b) Explain high liquid limit in terms of crystal structure of this mineral.
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(c) Would you recommend founding light structures on shallow footings above this soil? Why?
2 Derive governing equation for saturated flow.
3 Explain in detail various clay-water interaction mechanisms in soils.
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4 (a) Define pre-consolidation pressure. Describe a suitable procedure for determining the pre- consolidation pressure.
(b) A 3 m thick clay layer beneath a building is overlain by a permeable stratum and is underlain by an impervious rock. The coefficient of consolidation of the clay was found to be 0.025 cm²/min. The final expected settlement for the layer is 8 cm. Determine: (i) How much time will it take for 80 percent of the total settlement. (ii) The required time for a settlement of 2.5 cm to occur. (iii) The settlement that would occur in one year.
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5 (a) Derive the expression for Skempton pore pressure parameters (A and B).
(b) How these parameters can be determined in the laboratory?
(c) The following data relate to a triaxial compression tests performed on a soil sample:
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Test Chamber Max. deviator Pore water
No. Pressure (kN/m²) Stress (kN/m²) Pressure (kN/m²)
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1 80 175 45
2 150 240 50
3 210 300 60
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Determine the total and effective stress parameters of the soil.
6 (a) Explain with neat sketches, several possible types of variation for u₁ (pore water pressure) with depth of clay layer undergo consolidation and also write down the relationship for u₁ and boundary conditions.
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(b) Write short notes on normally consolidated clay and over consolidated clay.
7 The equation of the effective stress failure envelope for a loose, sandy soil was obtained from a direct shear test at τf = σ tan 30°. A drained triaxial test was conducted with the same soil at a chamber confining pressure of 70 kN/m². Calculate the deviator stress at failure.
8 Comment on the mechanisms of primary consolidation and secondary compression in terms of the rate-controlling factors, influences of and effects on soil structure, whether they occur sequentially or concurrently, and the suitability of our usual procedures for quantifying them for geo-engineering analysis.
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This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)