Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 6, Problem 6.6P
To determine
Find the hydraulic conductivity for specimen A and specimen B.
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In a constant-head permeability test, a sample of soil 12 cm long and 6 cm in diameter discharged 1.5 x 10^(-3) m^3 of water in 10 minutes. The head difference in two piezometers A and B located at 1 cm and 11 cm, respectively, from the bottom of the sample is 2 cm.
Determine the hydraulic conductivity of the soil. What is the soil type tested?
In a constant-head permeability test, a 60 cm3 of water was collected in 25 seconds with a head difference of “H” cm in a soil sample that has a diameter of 8 cm and length of 12 cm. Calculate the hydraulic conductivity. If the sample has a porosity of 60%, determine the average velocity and seepage velocity. Estimate the coefficient of permeability of a soil similar to the sample with a porosity of 45% from the results of this test.
In a constant-head permeability test, a 60 cm3 of water was collected in 25 seconds with ahead difference of 24.3 cm in a soil sample that has a diameter of 8 cm and length of 12 cm.Calculate the hydraulic conductivity. If the sample has a porosity of 60%, determine the averagevelocity and seepage velocity. Estimate the coefficient of permeability (cm/s) of a soil similar tothe sample with a porosity of 45% from the results of this test. Show your complete solution.
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Fundamentals of Geotechnical Engineering (MindTap Course List)
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- A falling head hydraulic conductivity test is performed on a sample of soil. The standpipe having a diameter 0.2cm is observed and it takes 60 seconds for the water to drop to 50 cm from an initial hydraulic head of 90cm. The sample has a height of 20cm and a diameter of 4cm. Find the coefficient of permeability of soil.arrow_forwardA constant-head test was conducted on a sample of soil 15 cm long and 60 cm^2 in cross-sectional area. The quantity of water collected was 50 cm^3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity in cm/s. a.1.0 x 10^-1 b.4.3 x 10^-3 c.2.6 x 10^-6 d.3.47 x 10^-2arrow_forwardFor a variable head permeability test, these values are given:• Length of the soil specimen 200 mm• Area of the soil specimen 1000 mm2• Area of the standpipe 40 mm2• Head difference at time t 0 is 500 mm• Head difference at time t 3 min is 300 mma. Determine the hydraulic conductivity of the soil in cm/sec.b. What was the head difference at time t 100 sec?arrow_forward
- In a constant head permeability test, a sample of soil 12cm long and 6cm in diameter discharged 1.8 x10^-3m^3 of water in 15 minutes. The head difference in two piezometers A and B located at 1cm and 11cm, respectively, from the bottom of the sample is 2cm A.Determune the hydraulic conductivity of the soil in cm/s Choices: 0.32,0.40,0.35,0.34 B.Calculate the discharge velocity in mm/s Choices: 0.79,0.68,0.71,0.64 C. How long will it take in minutes for the test to collect 3L of water Choices: 22.29,25,26.15,27.69arrow_forwardFor a falling head laboratory test, the following are the given values:• Length of soil specimen = 480.0 mm• Initial head = 700.00 mm• Final head = 395.00 mm• Duration of test = 5.5 mins• Area of standpipe = 0.97 sq.cm• Area of specimen = 18.0 sq.cmA. Compute for the hydraulic conductivity of the soil in cm/sec.B. Determine the head difference at t = 3.50 mins.arrow_forwardFor a falling-head permeability test, the following values are given: · Length of specimen = 250 mm. · Area of soil specimen = 1200 mm2. · Area of standpipe = 50 mm2. · Head difference at time t = 0 = 600 mm. · Head difference at time t = 200 sec = 300 mm. Determine the hydraulic conductivity of the soil in cm/sec.arrow_forward
- Calculate the equivalent hydraulic conductivity in horizontal and vertical direction for the soil profile shown in Figure Q3. [Hint: Assume head loss of each layer is equal to its thickness (zi=hi)].arrow_forwardA falling-head permeability test was carried out on a clay soil of diameter 10 cm and length 15 cm. In 1 hour the head in the standpipe of diameter 5 mm dropped from 68 cm to 50.2 cm. Calculate the hydraulic conductivity of this clay.arrow_forward8. The figure shows the layers of soil in a tube that is 100 mm x 100 mm in cross section. When supplied to maintain a constant head difference of 300 mm across the sample. The hydraulic conductivity of the soils in the direction to flow to them are as follows: Soil A = 2 x 10 ^ -2 cm/sec Soil B = 3 x 10 ^ -3 cm/sec Soil C = 4 x 10 ^ -4 cm/sec (See picture below) Find the equivalent hydraulic conductivity Find the hydraulic gradient Find the rate of water supply in cm3/hr.arrow_forward
- The figure below shows three layers of soil in a tube that is 150 mm × 200 mm in cross section. Water is supplied to maintain a constant-head difference of 400 mm across the sample. The hydraulic conductivity of the soils in the direction of flow through them are ka = 1.50 × 10−2 cm/s, kb = 3.50 × 10−3 cm/s, and kc = 6.50 × 10−4 cm/s Find the rate of water supply in cm3/hr. Determine the magnitudes of hA and hBarrow_forwardFor a falling-head permeability test, the following values are given:• Length of specimen 8 in.• Area of soil specimen 1.6 in.2• Area of standpipe 0.06 in.2• Head difference at time t 0 20 in.• Head difference at time t 180 sec 12 in.Determine the hydraulic conductivity of the soil in in./secarrow_forwardThe data from a falling-head test on a silty clay are: Cross sectional area of soil = 1000 mm^2 Length of soil sample = 200 mm Area of stand pipe = 40 mm^2 Head difference at time t = 0 is 500 mm Head difference at time t = 3 min is 300 mm a) Determine the hydraulic conductivity of the soil in cm/sec. b) What is the head difference at time t = 100 sec in mmarrow_forward
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