Which of the following statements is incorrect?

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OSSC JE Civil Mains (Re-Exam) Official Paper: (Held On: 3rd Sept 2023)
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  1. Under quicksand conditions, total stress can be zero
  2. Soil particles can move under quicksand condition
  3. Quicksand is related to upward seepage
  4. Quicksand condition is remote in cohesive soils

Answer (Detailed Solution Below)

Option 1 : Under quicksand conditions, total stress can be zero
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Detailed Solution

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Quicksand Condition:

  • Quicksand condition occurs when water flows upward through sandy soil with sufficient force, reducing the effective stress to near zero, which allows soil particles to move.
  • It is related to upward seepage of water and is typically seen in loose, granular soils.
  • Soil particles can move freely when effective stress is lost, giving the appearance of the soil behaving like a liquid.
  • Quicksand conditions are remote in cohesive soils because they have stronger bonds between particles and resist such conditions.
  • However, under quicksand conditions, the total stress is never zero. It's the effective stress that becomes zero, while the total stress still includes the weight of the soil and water.

The incorrect statement is:

Option 1) Under quicksand conditions, total stress can be zero ```
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