Gujarat Technological UniversitySummer 2025 examination

GTU 3130606 Geotechnical Engineering Summer 2025 Question Paper & PDF

B.E. · Civil Engineering · Semester 3 · Subject code 3130606
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Differentiate between Shallow foundation and Deep foundation.
(b)
4 marks
Discuss the factors affecting the permeability of soil.
(c)
7 marks
Derive the relation between following:
1Water content, Void ratio, Specific Gravity and Degree of saturation.
2Void ratio and Porosity

Q.2

14 Marks
(a)
3 marks
What are the three phase of soil?
(b)
4 marks

Define the terms: Void ratio, Degree of saturation, Bulk mass density, Water content.

(c)
7 marks
Describe the method of liquid limit of soil by Casagrande method.
(c)
7 marks
Describe plate load test with neat sketches.

Q.3

14 Marks
(a)
3 marks
What are the different methods of compaction adopted in the field?
(b)
4 marks
Explain Terzaghi’s “Spring analogy” for consolidation of soil.
(c)
7 marks

A soil sample has a liquid limit of 45 %, plastic Limit 22% and flow index of 10 %. Natural water content of soil is 13% so determine

i)Plasticity index.
ii)Liquidity index
iii)Consistency Index.
iv)Toughness index.
(a)
3 marks
Differentiate between compaction and consolidation
(b)
4 marks
Define:
i)Permeability
ii)Seepage
iii)Hydraulic Gradient
iv)Critical Hydraulic Gradient
(c)
7 marks

A laboratory compaction test on soil having G = 2.70 gave MDD of 1.90 g/cc and a water content of 13%. Determine the degree of saturation, air content and percentage air voids at the maximum dry density. What would be theoretical maximum dry density corresponding to zero air voids at the optimum moisture content.

Q.4

14 Marks
(a)
3 marks
Explain pressure bulb.
(b)
4 marks
Explain briefly New-mark’s influence chart.
(c)
7 marks

Describe direct shear test. What are the advantages of this test? What are its limitations?

(a)
3 marks
Explain modified Mohr-coulomb theory.
(b)
4 marks
Explain factors affecting selection of type of foundation.
(c)
7 marks

Enlist the assumptions of Rankine’s theory. Derive the expression for active pressure and passive pressure.

Q.5

14 Marks
(a)
3 marks
Enlist different types of slope failures.
(b)
4 marks

Mention the conditions where pile foundation is more suitable than shallow foundation.

(c)
7 marks

A strip footing 2m wide at a depth of 1.2 m in sand. The saturated unit weight of sand is 19.5 kN/m³ and unit weight above water table is 16.8 kN/m³, and having angle of shearing resistance is 35˚.Determine the Ultimate bearing capacity for the following cases of location of water table:

iWater table is 1.2 m below G.L
iiWater table is at G.L itself. Use Terzaghi’s theory.( Nq=41.4, Nγ=42.4 Nc=41.4,)
(a)
3 marks
Define the following terms:
IFoundation
IIBearing Capacity
IIIUltimate bearing capacity
(b)
4 marks
Define stability number. Discuss its utility in the analysis of stability of slopes.
(c)
7 marks

A 30 cm diameter concrete pile is driven into homogeneous consolidated clay deposit (c= 40 kN/m², α=0.7). If the embedded length is 10m , estimate the safe load( F.S.= 2.5).

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About this paper

Official Gujarat Technological University (GTU) examination paper for Geotechnical Engineering (Summer 2025, B.E. · Civil Engineering, Sem 3). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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