1.For a constant head laboratory permeability test on afine sand, the following values are given: L = 300 mm;D₁ = 200 mm; h = 400 mm; Vol = 420 m³; t = 4 min; e =0.55.a. Compute the coefficient ofpermeability in cm/sec.b. Compute the dischargevelocity in cm/sec.c. Compute thevelocity.seepage2.For a falling head permeability test, the following aregiven. Length of specimen is 380 mm, are of specimen -6.5 cm², hydraulic conductivity of soil specimen is 0.175cm/min.a. What should be the area ofthe stand pipe for the headto drop from 650 cm to 300cm in 8 min?

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1. For a constant head laboratory permeability test on a fine sand, the following values are given: L = 300 mm; D₁ = 200 mm; h = 400 mm; Vol = 420 m³; t = 4 min; e = 0.55. a. Compute the coefficient of permeability in cm/sec. b. Compute the discharge velocity in cm/sec. c. Compute the seepage velocity.

1. For a constant head laboratory permeability test on a fine sand, the following values are given: L = 300 mm; D₁ = 200 mm; h = 400 mm; Vol = 420 m³; t = 4 min; e = 0.55. a. Compute the coefficient of permeability in cm/sec. b. Compute the discharge velocity in cm/sec. c. Compute the seepage velocity.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.14P

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Concept explainers

Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.

Question

1.
For a constant head laboratory permeability test on a
fine sand, the following values are given: L = 300 mm;
D₁ = 200 mm; h = 400 mm; Vol = 420 m³; t = 4 min; e =
0.55.
a. Compute the coefficient of
permeability in cm/sec.
b. Compute the discharge
velocity in cm/sec.
c. Compute the
velocity.
seepage
2.
For a falling head permeability test, the following are
given. Length of specimen is 380 mm, are of specimen -
6.5 cm², hydraulic conductivity of soil specimen is 0.175
cm/min.
a. What should be the area of
the stand pipe for the head
to drop from 650 cm to 300
cm in 8 min?

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For a constant head laboratory permeability test on a fine sand, the following are given:Length of specimen = 250 mmDia. of specimen = 62.5 mmHead difference = 450 mmWater collected in 2 min. = 484 cu.mmDetermine the discharge velocity in mm/sec.
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ASAP PLS complete solution
1. A sand sample of 35 cm² cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 mL in 6 min. The dry weight of sand used for the test was 1120 g, and G₁ = 2.68. Determine (a) the hydraulic conductivity in cm/sec, (b) the discharge velocity, and (c) the seepage velocity.
← Darcy' Law A sand sample of 35 m² cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 km, the discharge was 120 ml in 6 min. The dry unit weight of sand used for the test was 1120 g. and GS = 2.68 Take Sw = 1 g/ cm³ The hydraulic conductivity (in cm/sec) is × 10-³ X
D. Law,
Don't mind the circle Ps. Not graded