Download GTU BE/B.Tech 2019 Winter 6th Sem Old 160606 Geotechnical Engineering Ii Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem Old 160606 Geotechnical Engineering Ii Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VI (Old) EXAMINATION ? WINTER 2019
Subject Code: 160606 Date: 09/12/2019

Subject Name: Geotechnical Engineering - II

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Analyse finite slope of purely cohesive soil (?u = 0) by Swedish circle method. 07
(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
3
. 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/m
3
.
07
OR
(b) Explain Culmann?s graphical method for theory of earth pressure. 07

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
2
. 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 ? = 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

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

Q.5 (a) Write the short note on:
(A) Group efficiency of pile
(B) Negative skin friction
07
(b) Explain Terzaghi?s bearing capacity theory with assumptions. 07
OR

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/m
3
, c = 20 kN/m
2
, and ? = 20?. Assume factor of safety of 2.5. Terzaghi?s
bearing capacity factors for ? = 20? are Nc = 17.7, Nq = 7.4 and N? = 5. What
is the permissible load per meter run of the footing?
07
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