Question

A strata of 3 m thick fine sand has a void ratio of 0.5 and specific gravity of 2.5. For a quick sand condition to develop in this strata, the flowing in upward direction would require a head of:

• A. 7 m
• B. 3 m
• C. 3.5 m
• D. 4.5 m

Hint:

For many typical soils where $(G-1) \approx (1+e)$, the critical hydraulic gradient $i_c$ is approximately 1.0. This means quick sand condition often occurs when the head is equal to the thickness of the soil layer.

Answer 1

The Correct Option is B