Question

The critical hydraulic gradient ic is unity when the specific gravity G=2.67 and voids ratio e is ______

(a) 0.67

(b) 0.33

(c) 0.43

(d) 0.80

I have been asked this question in my homework.

I need to ask this question from Seepage Pressure and Upward Flow topic in portion Seepage Analysis of Geotechnical Engineering I

Answer 1

The correct option is (a) 0.67

For explanation I would say: Given,

specific gravity G=2.67

critical hydraulic gradient ic=1

The critical hydraulic gradient ic is given by,

\(i_c=\frac{G-1}{1+e}\)

\(1=\frac{2.67-1}{1+e}\)

∴ e=0.67.