9. An experimental setup in the laboratory is shown. Two 50 mm diameter soil samples A and B are placed under constant head. (All dimensions are in mm.) The permeability of sample A is twice that of sample B. Assuming the tail water level as the datum, what is the total head at the interface between the soil samples? If 200 ml of water flows through the sample in 5 minutes, determine the permeabilities of the two soil samples. Water 412 140 Answer: 62.5 mm, 0.076 cm/s, 0.038 cm/s 4 B Datum 287

9. An experimental setup in the laboratory is shown. Two 50 mm diameter soil samples A and B are placed under constant head. (All dimensions are in mm.) The permeability of sample A is twice that of sample B. Assuming the tail water level as the datum, what is the total head at the interface between the soil samples? If 200 ml of water flows through the sample in 5 minutes, determine the permeabilities of the two soil samples. Water 412 140 Answer: 62.5 mm, 0.076 cm/s, 0.038 cm/s 4 B Datum 287

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

9. An experimental setup in the laboratory is shown. Two 50 mm diameter soil samples A
and B are placed under constant head. (All dimensions are in mm.) The permeability of
sample A is twice that of sample B. Assuming the tail water level as the datum, what is the
total head at the interface between the soil samples? If 200 ml of water flows through the
sample in 5 minutes, determine the permeabilities of the two soil samples.
Water
412
140
Answer: 62.5 mm, 0.076 cm/s, 0.038 cm/s
4
B
Datum
287

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