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03000CE305092001

PART 13
Answer any two full questions, each carries 15 marks.

A square footing 2 m wide is founded at a depth of 1.4 m in sand. Soil properties
are c=0, d= 35°, Year 19 kN/m? and unit weight above water table = 17.5
kN/m*. Bearing capacity factors are Nq= 41.4 and Ny = 42.4 . Determine
Ultimate bearing capacity if water table is at i) 3.5 m below ground level 1) 1.4
m below ground level
What are the assumptions of Terzaghi’s bearing capacity theory?
Explain any four methods adopted to rectify tilts and shifts in well foundation
Design a combined trapezoidal footing for two columns of sizes 0.5 m x 0.5 m
and 0.3 m x 0.3 m carrying loads 3000 KN and 2000 KN respectively. Centre to
centre distance of columns = 5 m. Footings shall not project beyond the outer
surface of columns. Allowable soil pressure is 250 10007.
Explain the types of failure mechanisms in shallow foundations
Explain the Preloading method of soil improvement
Explain the components of a well foundation with a neat sketch
Determine the net allowable load for a circular footing of 2.5 m diameter
founded at a depth of 1.2m. Soil properties are c = 80 kN/m’, Take factor of
safety as 3.
What is a floating raft foundation?
PART C

Answer any two full questions, each carries 20 marks.
Explain Standard Penetration test and its correlations with shear strength
parameters. What are the corrections to be applied for SPT value?
A RCC pile weighs 50 KN. It is driven by a single acting steam hammer
weighing 40 KN, height of fall is 1 m. Average set/blow is 1.0 cm. Take elastic
compression as 1.8 cm. Assuming coefficient of restitution as 0.5. Find safe load
on pile. Assume factor of safety of 2.5.

What are the objectives of a Subsoil exploration programme?

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