Question

The flow net around a sheet pile wall is shown in the sketch. The properties of the soil are : permeability coefficient = 0.09 m/day (isotropic), specific gravity = 2.70 and void ratio = 0.85. The sheet pile wall and the bottom of the soil are impermeable.

The seepage loss (in $m^3$ per day per unit length of the wall) of water is

• A. 0.33
• B. 0.38
• C. 0.43
• D. 0.54

Answer 1

The correct option is B 0.38

Permeability coefficient,

k = 0.09 m/day

Specific gravity, $G_s=2.7$

Void Ratio, e = 0.85

From figure, Number of flow channel,

$N_f=4$

Number of potential drops,

$N_d=8$

Head loss, H = 10 - 1.5

= 8.5 m

$Seepageloss=kH\frac{N_f}{N_d}$

$=0.09\times 8.5\times \frac{4}{8}$

= 0.38 $m^3/day$ per meter length