Which of the following statements regarding the Quick sand condition is INCORRECT? 

Explanation:

Quick Sand Condition

Quick sand condition is a state where saturated soil loses its strength and behaves like a liquid due to the upward flow of water. This phenomenon occurs in certain types of soil under specific conditions.

Analyzing the Given Options

1. "Quick sand condition is most likely to occur in silt and fine sand." (Correct)

   • Quick sand condition primarily occurs in fine-grained soils such as silt and fine sand.

   • These soils are susceptible to liquefaction under certain conditions.

2. "Quick sand is not a special type of soil." (Correct)

   • Quick sand condition refers to a state of soil rather than a specific type of soil.

   • It occurs when the soil becomes saturated with water and loses its strength.

3. "Cohesive soil will become quick as it still possesses some strength equal to cohesion intercept." (Incorrect)

   • Cohesive soils have significant cohesion, which prevents them from becoming quick sand.

   • Quick sand condition typically occurs in cohesionless soils that lack significant cohesion.

   • The given statement contradicts this fact, making it the correct answer.

4. "This condition occurs in cohesionless soils only." (Correct)

   • Quick sand condition is common in cohesionless soils like sand and silt.

   • These soils lose their strength when saturated with water and subjected to upward hydraulic pressure.