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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-V EXAMINATION WINTER 2018
Subject Code:X50603 Date: 20/11/2018
Subject Name: Foundation 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.
Q.1

What do you mean by bearing capacity? Enlist various types of bearing capacities and define them.
07

Explain in detail with neat sketch plate load test by truss reaction method
07
Q.2

Define SPT value. Explain the corrections applied to SPT value with engineering reasons .
07

Discuss the various types of foundation settlement under loads and also state various causes of settlement .
07
OR

What do you mean by under-ream pile and where it is used? Discuss its design guidelines with neat sketch.
07
Q.3

Explain objectives of sub surface exploration.
07

Determine net allowable load and gross allowable load for a square footing of 2m×2m size and 1.0m depth . Use Terzaghi's theory.ү factor of safety Nc =14.8,
07
OR
Q.3

Explain types and uses of Geosynthetics.
07

Write purposes of site investigation.
07
Q.4

What are the effects of swelling of soils on buildings
07

Enlist boring methods and explain any one in detail.
07
OR
Q.4

What is minimum depth of foundation required to trasmit a load of 60 kN/m2 in a cohesionless soil having γ =17 kN/m3 and What will be the bearing capacity if the of 1.2 m is adopted. Use Rankine analysis.
07

Explain in detail the types of failure of pile group.
07
Q.5

A pile is driven with a single acting steam hammer of weight 30kN with a free fall of 1.2 m. The average penetration of the last 20 blows is 25mm. Find the safe load using the ENR formula.
07

Describe behavior of collapsible soils.
07
OR
Q.5

Differentiate between general shear failure and local shear failure.
07

Discuss various dynamic formulae. What are their limitations?
07