Enrolment No.
Subject Code: 160606
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (Old) EXAMINATION - WINTER 2019
Subject Name: Geotechnical Engineering - 11
Time: 02:30 PM TO 05:00 PM
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Analyse finite slope of purely cohesive soil (Qu = 0) by Swedish circle method. [07]
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(b) Explain how to determine factor of safety for the stability analysis of infinite slope. [07]Q.2 (a) Explain active earth pressure, passive earth pressure and earth pressure at rest. [07]
(b) Compute the intensities of active and passive earth pressure at depth of 8m in dry cohesionless sand with an angle of internal friction of 30° and unit weight of 18 kN/m?. What will be the intensities of active and passive earth pressure if the water level rises to the ground level? Take saturated unit weight of sand as 22 kN/m3. [07]
OR
(b) Explain Culmann’s graphical method for theory of earth pressure. [07]
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Q.3 (a) Derive Boussinesq’s equation to calculate intensities of vertical pressure directly below the point load on axis of loading. [07]
(b) A water tank is supported by a ring foundation having outer diameter of 10 m and inner diameter of 7.5 m. The ring foundation transmits uniform load intensity of 160 kN/m?. Compute the vertical stress induced at a depth of 4 m, below the centre of ring foundation, using)(a) Boussinesq’s analysis and (b) Westergaard’s analysis taking p = 0. [07]
OR
Q.3 (a) Explain different types of soil Samplers to collect soil samples from the ground. [07]
(b) Describe standard penetration test. How the observed N — value is corrected? [07]
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Q.4 (a) What are the factors affects the selection of type of foundations? Explain in detail. [07]
(b) Write short note on Electrical resistivity method. [07]
OR
Q.4 (a) Describe classification of piles in detail. [07]
(b) A pile is driven with a single acting hammer of weight 15 kN with a free fall of 900 mm. The first set, the average of the last three blows, is 27.5 mm. Find the safe load using the Engineering News formula. [07]
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Q.5 (a) Write the short note on: [07]
(A) Group efficiency of pile
(B) Negative skin friction
(b) Explain Terzaghi’s bearing capacity theory with assumptions. [07]
OR
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Q.5 (a) Explain the plate load test in detail. [07]
(b) Compute the safe bearing capacity of a continuous footing 1.8 m wide, and located at a depth of 1.2 m below ground level in a soil with unit weight 20 kN/m3, ¢ = 20 kN/m?, and @ = 20°. Assume factor of safety of 2.5. Terzaghi’s bearing capacity factors for @ = 20° are Nc = 17.7, Nq = 7.4 and Ny = 5. What is the permissible load per meter run of the footing? [07]
Date: 09/12/2019
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