What are the factors that affect the selection of a particular foundation type? Discuss any of the factors in detail.
[3 marks]Differentiate between shallow and deep foundations.
[4 marks]Asquare footing is subjected to a 5000 kN. The density of soil is 2000 kg/m3. The depth of the foundation is 1 m. The factor of safety is assumed to be 1.5. Determine the size of the footing. c= 20 kPa and φ =350. Nc=7, Nq= 38, Nγ= 42.
[7 marks]Write down the objectives of soil exploration.
[3 marks]What are the factors that affect the selection of a particular foundation type? Discuss any one of the factors in detail.
[4 marks]Discuss in brief the corrections required for overburden and dilatancy of a Standard Penetration Test (SPT) as per IS 2131-1981.
[7 marks]Elaborate on various modes of shear failures of soil associated with shallow foundations.
[7 marks]As per the IS 1892-1972, what are the prescribed depth of foundation for: (a)Isolated footings, (b)Raft foundation, and (c)Road cuts.
[3 marks]Discuss the utility of an under-reamed pile with a neat diagram.
[4 marks]Discuss the steps involved in apportioning of a shallow foundation considering only shear failure criterion.
[7 marks]What are the different types of soil samples?
[3 marks]Based on their design and use, classify soil samplers (give the names only without describing them).
[4 marks]With a neat diagram, define the following terms of a typical soil sampler:
[7 marks]Inside Clearance, (b)Outside Clearance, and (c) Area Ratio
[ marks]Write down three main advantages of geophysical exploration.
[3 marks]Discuss the advantages and disadvantages of seismic refraction method.
[4 marks]Write down the major types of machines and their suitable foundations.
[7 marks]What are the major disadvantages of geophysical exploration?
[3 marks]Discuss the advantages and disadvantages of electric resistivity method.
[4 marks]Draw the pressure diagram below the rigid and flexible footings resting on cohesive and cohesionless soils.1
[7 marks]Write down at least three factors affecting the bearing capacity of a shallow foundation.
[3 marks]Define ultimate bearing capacity, net ultimate bearing capacity, net safe bearing capacity, and safe bearing capacity
[4 marks]With a neat diagram, discuss the Terzaghi’s theory on bearing capacity.
[7 marks]Discuss very briefly the design principles of a foundation of a reciprocating machine.
[3 marks]Determine the spacing of 4 × 3 piles group to carry 1000 kN load and installed in cohesionless soils with φ =350. The diameter and length of piles are 0.75 m and 12 m. Assume Nγ=35.
[4 marks]Discuss the classification of piles based on (a) load carrying capacity,
[7 marks]method of installation, and (c) materials of construction.
[ marks]