In a falling-head permeability test the initial head of 1.00m dropped to 0.35m i

Question

In a falling-head permeability test the initial head of 1.00m dropped to 0.35m in 3 h, the diameter of the standpipe being 5 mm. The soil specimen was 200mm long by 100mm in diameter. Calculate the coefficient of permeability of the soil. In a falling-head permeability test the initial head of 1.00m dropped to 0.35m in 3 h, the diameter of the standpipe being 5 mm. The soil specimen was 200mm long by 100mm in diameter. Calculate the coefficient of permeability of the soil. In a falling-head permeability test the initial head of 1.00m dropped to 0.35m in 3 h, the diameter of the standpipe being 5 mm. The soil specimen was 200mm long by 100mm in diameter. Calculate the coefficient of permeability of the soil.

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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