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Posted By: kondapalli Member Level: Gold Posted Date: 01 May 2008
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2007 Jawaharlal Nehru Technological University B.E Civil SOIL DYNAMICS AND MACHINE FOUNDATION-set4 Question paper
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1. (a) What are the safe bearing pressures and how are they arrived at? [8]
(b) Describe the various types of machine foundations. [8]
2. Starting from fundamentals, obtain the equations of motion for over damped, crit-
ically damped and under damped systems. [16]
3. (a) Out line Barken?s method for finding natural frequency. [6]
(b) A machine weighing 100kg is supported directly on springs having a stiffness of
200kg/m. The unbalanced rotating mass results in a disturbing force of 20kg
at a speed of 3000r.p.m. The damping factor is 0.1. Determine the amplitude
of vibration and the force transmitted to the foundation. [10]
4. (a) Why is vibration isolation required [8]
(b) What do you understand by active isolation and passive isolation. [8]
5. What are the laboratory methods used to determine the dynamic properties of
soils? Explain them in brief. [16]
6. (a) Explain the step by step. procedure of pauw?s analogy. [8]
(b) In Pauw?s analysis, the base of the machine is 2 × 3.5 m, penetrating 1
m below ground level. If the amplitude of vibration is 0.002 cm, apply the
reduction factor for embedment and determine the likely amplitude. [8]
7. (a) How do you analyse a block foundation based on elastic half-space theory? [8]
(b) Explain Quinlan and Sung’s modifications. [8]
8. Explain in detail the I.S.code method of design of hammer foundation. [16]
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