Question

Calculate the critical hydraulic gradient for a soil deposit with a void ratio of 0.7 and having a specific gravity of 2.7.

• A. 0.25
• B. 0.5
• C. 1
• D. 1.5

Hint:

For quick calculations of $i_c$, use $\frac{G_s - 1}{1 + e}$. Always ensure values for $G_s$ and $e$ are accurate for reliable results.

Answer 1

The Correct Option is C

The critical hydraulic gradient ($i_c$) is calculated using the formula: \[ i_c = \frac{G_s - 1}{1 + e} \] where: $G_s = 2.7$ (specific gravity of solids),  $e = 0.7$ (void ratio).
Substitute the values: \[ i_c = \frac{2.7 - 1}{1 + 0.7} = \frac{1.7}{1.7} = 1.0 \]