GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (OLD) EXAMINATION - WINTER 2018
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Subject Code:160606 Date: 27/11/2018Subject Name: Geotechnical Engineering - 11
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain Plate load test. [07]
(b) Differentiate between General shear failure and Local shear failure with neat sketch. [07]
Q.2 (a) Write short note on Active and Passive earth pressure. [07]
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(b) A retaining wall 10 m high retains a cohesionless soil with an angle of internal friction 35°. The surface is level with the top of the wall. The unit weight of the top 3 m of the fill is 1.6 t/m³ and that of the rest is 2 t/m³. Find the magnitude and application of the resultant active thrust. [07]OR
(b) What are the graphical methods available for the determination of active earth pressure? Explain any one in detail [07]
Q.3 (a) Calculate the factor of safety with respect to cohesion, of a clay slope laid at 1 in 2 to a height of 10 m, if the angle of internal friction f = 10° ; c = 25 kN/m² and ? = 19 kN/m³. Take Sn = 0.064. What will be the critical height of the slope in the soil? [07]
(b) Discuss about stability analysis of Infinite slopes for c-f soils. [07]
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OR
Q.3 (a) What are the basic modes of failure of earth slopes? What are the remedial measures to prevent failure of earth slopes? [07]
(b) Discuss stability analysis of Finite slopes. [07]
Q.4 (a) Explain swedish circle method of stability analysis [07]
(b) Write a short note on Newmark’s influence chart. [07]
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OR
Q.4 (a) Enlist various geophysical methods and explain any one in detail. [07]
(b) Explain in detail about the factors affecting the selection of types of foundation [07]
Q.5 (a) In a 16 pile group, the pile diameter is 45 cm and center to center spacing of the square group is 1.5 m. If c = 50 kN/m², determine whether the failure would occur with the pile acting individually, or as a group? Neglect bearing at the tip of the pile. All piles are 10 m long. Take m = 0.7 for shear mobilization around each pile. [07]
(b) Explain various stages involved in the construction of under reamed pile foundation [07]
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OR
Q.5 (a) Explain different types of piles. [07]
(b) How do you estimate the group capacity of piles in sand and clay? [07]
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