In a falling permeameter, the sample used is 20 cm long having a cross sectional area of 24 cm2. The sample of soil is made of three layers. The thickness of the first layer from the top is 8 cm and has a value of k1 = 2 x 10-4 cm/s, the second layer of thickness 6 cm has k2 = 5 x 10-4 cm/s and the bottom layer of thickness 4 cm has k3 = 7 x 10-4 cm/s. Assume the flow is taking perpendicular to the layers. Calculate the time required for the drop of head from 25 to 12 cm if the cross sectional area of the stand pipe is 2 cm2.a.71.5 minb.62.9 minc.87.8 mind.66.7 mine.58.81 min

To Determine the time required for the drop of head from 25 to 12 cm

Answered: In a falling permeameter, the sample…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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In a falling permeameter, the sample used is 20 cm long having a cross sectional area of 24 cm². The sample of soil is made of three layers. The thickness of the first layer from the top is 8 cm and has a value of k₁ = 2 x 10^-4 cm/s, the second layer of thickness 6 cm has k₂ = 5 x 10^-4 cm/s and the bottom layer of thickness 4 cm has k₃ = 7 x 10^-4 cm/s. Assume the flow is taking perpendicular to the layers. Calculate the time required for the drop of head from 25 to 12 cm if the cross sectional area of the stand pipe is 2 cm².

a.71.5 min

b.62.9 min

c.87.8 min

d.66.7 min

e.58.81 min

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