(c) In a constant head permeability test conducted on amedium silt, the following data was obtainedHead maintained 60 cmDiameter of the permeameter = 10 cmThickness of the soil specimen 10cmDischarge collected in 2-50 min 10c.cIf a falling head test is conducted on the same samplewhat time would be required for the head to fall from60 cm to 30cm in the stand pipe which has across-section area of 1-25 cm2?8

given:Head maintained= 60 cmDiameter of the permeameter=10 cm'Thickness of the soil specimen,or the…

Answered: (c) In a constant head permeability…

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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For a falling a head permeability test, the following data were recorded. Length of soil specimen = 500 mm. Area of soil specimen = 16 cm2 Area of stand pipe = 0.97 cm2 Head difference at time t =0 is 760 mm. Head difference at time t = 6min. is 410mm. The test was conducted at a temp. of 20 ֯C. with a unit wt. of water equal to 9.789 kN/m3 and the viscosity of water at 20 ֯C is 1.005 x 10-3 N.8/m2 . Compute the hydraulic conductivity of the soil. Compute the absolute permeability of the soil. What is the head difference at time t = 4 min?
The data from a falling head test is shown Diameter of the standpipe = 3cm Initial head = 91.77 cm duration of the test = 18 mins length of the soil sample = 32.98 cm diameter of the permeameter = 44 cm If the soil permeability id 0.005cm/min, determine the final head (in cm) of the permeability test.
A pumping test was carried out to determine the average permeability of a sand deposit 20 m thick overlying impermeable clay. The discharge from the pumping well was 12 x 10-3m3/s. Drawdowns in the observation wells located 15 m and 30 m from the centerline of the pumping well were 2.1 m and 1.6 m, respectively. Groundwater table was reached at 3.2 m below the ground surface. Determine the permeability of the sand. Estimate the effective grain size using Hazen’s equation.
A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. Provide step by step solution. a) Compute the permeability based on these test conditions and results. b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values, provide step by step solution solving h1 and h2 values.
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?
FUNDAMENTALS OF GEOTECHNICAL ANALYSIS A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. Provide step by step solution. a) Compute the permeability based on these test conditions and results. b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values?
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 5x106 cm/s. The diameter of the stand pipe was 1 cm. Determine how much head was lost during the first 33 mins.
A sand cone test was conducted in the field. The mass of wet soil excavated from the hole is 3668.3g with a moisture content of 17.2%. Before and after the test, the sand cone apparatus weighed 10154.0g and 5749.4g. The cone can contain 1680g of Ottawa Sand (ρ=1.353g/cc). If the maximum dry density of the soil is 1.702g/cc, calculate the relative compaction.
FUNDAMENTALS OF GEOTECHNICAL ANALYSIS A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. a) Compute the permeability based on these test conditions and results. b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values?
Results of a standard proctor ompaction test on a silty sand are shown. PLEASE COMPLETE SOLUTION. 1) Find the maximum dry unit weight and optimum moisture content. ANS: ydmax = 19 kn/m3 omc = 10% or 0.1 2) What is the moist unit weight at optimum moisture content? ANS: 20.9 kn/m3 3) What is the degree of saturation at optimum moisture content? Given: Gs = 2.69 ANS: 69.17% PLEASE ANSWER THE REMAINING QUESTIONS 4) If the required field dry unit weight is 18.5 kn/m3, what is the relative compaction? 5) What should be the range of compaction moisture contents in the field to achieve the above relative compaction? 6) If the minimum and maximum void ratios are 0.31 and 0.82,respectively, what is the relative density of compaction in the field?
A sand cone test was conducted in the field. The mass of wet soil excavated from the hole is 3668.3g with a moisture content of 17.2%. Before and after the test, the sand cone apparatus weighed 10154.0g and 5749.4g. The cone can contain 1680g of Ottawa Sand (ρ=1.353g/cc). Solve the dry density of the soil sample.
Coefficient Permeability of Soil A falling head permeability test is conducted on silty soil. The sample diameter is 10.0 cmand its length or thickness is 7.8 cm. The diameter of the standpipe is 6.0 mm. The head at thestart of the test is 47.8 cm. The test lasts 8.5 min and the head falls to 22.6 cm. Find thecoefficient of permeability of this soil in cm/s? Provide step by step solution.

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