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06000CE305122003

height of 7m ,calculate the total active thrust developed per metre length of the
wall

PART B

Answer any two full questions, each carries 15 marks.

What is a Floating raft foundation ?
What are the remedial measures to be adopted to reduce differential settlement?
i) What are the situations under which a combined footing is preferred?
ii) Explain the procedure to proportion a trapezoidal combined footing .
Explain the sand drain method of soil improvement .
What is the effect of water table on bearing capacity ?
A square footing is located at a depth of 1.2 m below GL and carries a safe load
of 1700 KN . Find the size of footing if ७5357", y= 17 സിന്‌ , c= 10 kN/m’.
Bearing capacity factors are 14, = 57.8 , Ng= 41.4 , N ‏در‎ 42.4.Factor of safety =3
A raft 20 m x 10 m rests on cohesive soil with c= 40 kN/m? and y= 17 kN/m? .
The foundation carries a load of 25MN and is to be used as a basement . Find
factor of safety if depth of foundation is 2.8 m
A strip footing 2 m wide is located at a depth of 0.8 m below GL. Determine the
net safe bearing capacity if p=20°, y= 19 100/17 , c= 20 KN/m’. Bearing capacity
factors are पि = 11.8 , N’g=3.9 , N’ ‏حر‎ 1.7 and factor of safety =3
Explain the functions of components of well foundation with a neat sketch
PART C

Answer any two full questions, each carries 20 marks.
What is Negative skin friction ? How is it caused ?
Explain the methods of vibration isolation
i)Explain Standard Penetration Test
ii) Field N value in a deposit of fully saturated fine silt was 45 at a depth of 7m.
Saturated unit weight of soil is 19 kN/m*. Calculate the corrected SPT value as
per IS code
Determine the coefficient of uniform elastic compression , if resonance occurred
at a frequency of 20cycles/second in a test block 1.5 x0.74 x0.7 m size . Weight
of oscillator is 3 KN. Unit weight of concrete = 24kN/m*
What are the IS guidelines for choosing depth and spacing of boreholes ?

Explain Pile load test . How allowable load is calculated from pile load test?

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