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Choose the incorrect statement:
1) Greater the confining pressure, smaller the critical void ratio.
2) A saturated loose sand is likely to liquify when subjected to earthquake shocks.
3) Failure envelope of over consolidated clay is a curve and not straight line.
4) For normally consolidated clays, ϕ decrease with an increase in plasticity.
  • a)
    1 and 2
  • b)
    3 only
  • c)
    4 only
  • d)
    None of these
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Choose the incorrect statement:1) Greater the confining pressure, smal...

The relationship between critical void ratio and confining pressure is shown in figure. As confining pressure increases, the critical void ratio decreases. With this knowledge of relationship it is possible predict the behaviour of sand at any ratio and at any given confining pressure.
All other statements are also true.
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Most Upvoted Answer
Choose the incorrect statement:1) Greater the confining pressure, smal...
Incorrect Statement in Soil Mechanics

Statement 1: Greater the confining pressure, smaller the critical void ratio.
This statement is correct as the critical void ratio decreases with an increase in confining pressure. This is because an increase in confining pressure leads to a decrease in the volume of voids available for compression.

Statement 2: A saturated loose sand is likely to liquify when subjected to earthquake shocks.
This statement is also correct as loose sand has a high tendency to liquefy under cyclic loading, such as earthquake shocks. The liquefaction occurs when the effective stress in the soil decreases to zero, causing the soil particles to lose their interlocking structure and behave like a fluid.

Statement 3: Failure envelope of over consolidated clay is a curve and not a straight line.
This statement is incorrect as the failure envelope of over consolidated clay is typically a straight line, unlike the curve observed in normally consolidated clay. This is because over consolidated clay has a pre-existing stress field that needs to be overcome before it can fail.

Statement 4: For normally consolidated clays, the cohesion decreases with an increase in plasticity.
This statement is also incorrect as cohesion is not affected by plasticity in normally consolidated clays. Instead, the undrained shear strength of the soil increases with an increase in plasticity.

Therefore, the incorrect statement in this question is Statement 4.
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Choose the incorrect statement:1) Greater the confining pressure, smaller the critical void ratio.2) A saturated loose sand is likely to liquify when subjected to earthquake shocks.3) Failure envelope of over consolidated clay is a curve and not straight line.4) For normally consolidated clays, ϕ decrease with an increase in plasticity.a)1 and 2b)3 onlyc)4 onlyd)None of theseCorrect answer is option 'D'. Can you explain this answer?
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