Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3150615 Soil Mechanics Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3150615 Date:03/02/2021
Subject Name:Soil Mechanics
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) Discuss various types of slope failures
03
(b) Differentiate the Infinite and finite slope.
04
(c) Explain Swedish circle method of stability. analysis
07
Q.2 (a) Write and explain Boussinesque's equation.
03
(b) Explain contact pressure.
04
(c) Write short note on "New-mark's Influence Chart".
07
Q.3 (a) Enlist factor affecting the bearing capacity and explain any one in detail.
03
(b) Define:
04
1. Gross pressure intensity
2. Ultimate bearing capacity
3. Safe bearing Capacity
4. Allowable bearing Capacity
(c) Describe plate load test with neat sketch.
07
Q.4 (a) Explain a types of pavements.
03
(b) Differentiate between General shear failure and Local shear failure with
04
neat sketch.
(c) A square footing 2.5 m by 2.5 m is built in a homogeneous bed of sand of
07
unit weight 20kN/m3 and having an angle of shearing resistance of 36?.
The depth of the base of footing is 1.5 m below the ground surface.
Calculate the safe load that can be carried by a footing with a factor of
safety of 3 against complete shear failure. Use Terzaghi's analysis. Take
Nc = 65.4, Nq = 49.4 and N = 54.
Q.5 (a) Write the basic principles involved in the geophysical methods of
03
subsurface soil exploration
(b) Explain Bore log in detail.
04
(c) What are the methods available for sub surface exploration? Explain
07
any one in detail.
Q.6 (a) Name and explain the shear tests which may be performed based on the
03
different drainage conditions.
(b) Explain importance of `Unconfined Compression Test'& `Laboratory
04
Vane Shear Test'.
(c) A standard specimen of cohesionless sand was tested in triaxial
07
compression and the sample failed at a deviator stress of 482 kN/m2, when
the cell pressure was 100 kN/m2, under drained condition. Find the
effective angle of shearing resistance of sand. What would be the deviator
stress and the minor principal stress at failure for another identical
specimen of sand if it s tested under a cell pressure of 200 kN/m2?
Q.7 (a) Enlist a different types of Geosynthetics
03
(b) Explain functions of Geosynthetics.
04
(c) In a 16 pile group, the pile diameter is 45 cm and center to center spacing
07
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.
Q.8 (a) Explain in detail "Under Reamed Pile Foundation".
03
(b) How do you estimate the group capacity of piles in sand?
04
(c) What is negative skin friction? What is its effect on the pile?
07
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This post was last modified on 04 March 2021