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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER IV • EXAMINATION SUMMER- 2017
Subject Code: 340603 Date: 03- 05 -2017
Subject Name: Soil Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Each question carry equal marks (14 marks)
Q.1

Define
Water Content Bulk Density Dry Density Specific Gravity
Void Ratio Porosity Degree of saturation
07





State methods to determine field density of soil and explain any one.
07



Q.2

Derive the relation: γd γb
07

γd γb


State the basis of classification of soil and explain I.S. classification of soil
07

I.S

OR

Explain consistency limits of soil with figure.
07



Q.3

Define permeability of soil and Explain factors affecting permeability of soil in detail.
07




Explain constant head permeability test.
07



OR
Q.3

State various methods of improving bearing capacity of soil and explain any one in detail.
07




Find coefficient of permeability of soil sample for following details.
07
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1.Diameter of soil sample: 10 cm 2.Diameter of stand pipe:1.2 cm
3.Length of soil sample: 12.6 cm 4. Initial head: 85 cm
5.Final head: 45 cm 6. Time for water head to fall: 80 minutes

10 cm 2. 1.2 cm
12.6 cm 4. 85 cm
5. 45 cm 6. 80 minutes

Q.4

Explain factors affecting compaction of soil in detail.
07




Differentiate between compaction and consolidation of soil Light and Heavy compaction test of soil
07



OR
Q. 4

During proctor test on soil, following observations were recorded.
Sr.no.
Water content
Bulk density KN/m3
1
6
16.0
2
8
17.3
3
10
20.0
4
14
18.8
Determine O.M.C. and M.D.D. of soil.
07




KN/m3
1
6
16.0
2
8
17.3
3
10
20.0
4
14
18.8


Explain box shear test of soil.
07



Q.5

Define cohesion, angle of internal friction, shear strength and angle of repose. Draw coulomb's shear strength envelopes of different soils.
07




Explain various types of foundations with neat sketch.
07



OR
Q.5

Explain types of earth pressure on retaining wall.
07




State various methods of field identification of fine grained soil and explain any one.
07