A deposit of soil is 16m deep and overlies an impermeable stratum: the coefficie

Question

A deposit of soil is 16m deep and overlies an impermeable stratum: the coefficient of permeability is 106 m/s. A sheet pile wall is driven to a depth of 12.00m in the deposit. The difference in water level between the two sides of the piling is 4.00 m. Draw the flow net and determine the quantity of seepage under the piling A deposit of soil is 16m deep and overlies an impermeable stratum: the coefficient of permeability is 106 m/s. A sheet pile wall is driven to a depth of 12.00m in the deposit. The difference in water level between the two sides of the piling is 4.00 m. Draw the flow net and determine the quantity of seepage under the piling A deposit of soil is 16m deep and overlies an impermeable stratum: the coefficient of permeability is 106 m/s. A sheet pile wall is driven to a depth of 12.00m in the deposit. The difference in water level between the two sides of the piling is 4.00 m. Draw the flow net and determine the quantity of seepage under the piling

Explanation / Answer

The coefficient of permeabilityis determined from the equation

k ¼ 2:3

al

At1

log

h0

h1

where

a ¼

4 0:0052 m2; l ¼ 0:2m

A ¼

4 0:12 m2; t1 ¼ 3 602 s

log

h0

h1 ¼ log

1:00

0:35 ¼ 0:456

; k ¼

2:3 0:0052 0:2 0:456

0:12 3 602 ¼ 4:9 108 m=s

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