Answered: what should be the area of the stand…

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Civil Engineering

what should be the area of the stand pipe for the head to drop from 700cm to 360cm in 7 mins

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.7P

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Concept explainers

Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.

Question

For a falling head permeability test, the following are given: length of specimen is 360 mm, area of specimen is 70 cm2 , and hydraulic conductivity of soil specimen is 0.165 cm/min.

what should be the area of the stand pipe for the head to drop from 700cm to 360cm in 7 mins?
compute the seepage velocity under the test condition if the soil specimen has a void ratio of 0.55 in cm/sec
compute the head difference at time equal to 5 minutes?

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