3. A falling-head permeability test was run on a soil sample 9.6 cm in diameter and 10 cm long. The head at the start of the test was 90 cm. The coefficient of permeability of the soil was found to be 5 x 10-6 cm/s. The diameter of the stand pipe was 1 cm. a) Determine the flow at the start of the test (cm³/hr) b) Determine how much head was lost during the first 30 minutes c) Determine the flow after 30 minutes (cm³/hr) 1 cm Ø Standpipe h 9.6 cm Ø Soil L = 10 cm

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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3. A falling-head permeability test was run on a soil sample 9.6 cm in diameter and 10 cm long. The head
at the start of the test was 90 cm. The coefficient of permeability of the soil was found to be
5 x 10-6 cm/s. The diameter of the stand pipe was 1 cm.
a) Determine the flow at the start of the test (cm³/hr)
b) Determine how much head was lost during the first 30 minutes
c) Determine the flow after 30 minutes (cm³/hr)
1 cm Ø
Standpipe
9.6 cm Ø
Soil
L = 10 cm
Useful Formulas:
hi As dh.
t =
h,
In ()
aL
k =
A(t2 – t,) h,
Transcribed Image Text:3. A falling-head permeability test was run on a soil sample 9.6 cm in diameter and 10 cm long. The head at the start of the test was 90 cm. The coefficient of permeability of the soil was found to be 5 x 10-6 cm/s. The diameter of the stand pipe was 1 cm. a) Determine the flow at the start of the test (cm³/hr) b) Determine how much head was lost during the first 30 minutes c) Determine the flow after 30 minutes (cm³/hr) 1 cm Ø Standpipe 9.6 cm Ø Soil L = 10 cm Useful Formulas: hi As dh. t = h, In () aL k = A(t2 – t,) h,
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