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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A 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. Estimate the hydraulic conductivity in cm/s with a porosity of 35% from the result of test.
a.2.6 x 10^-6
b.4.3 x 10^-3
c.7.0 x 10^-6
d.3.47 x 10^-2
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 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:
22.29,25,26.15,27.69
Chapter 6 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- The 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_forwardQuestion.2 : A soil sample 25 cm in height and 10 cm in diameter, was tested under a constant head of 40 cm. The quantity of water collected after 13 minutes was equal to 700 ml. The soil has a saturated water content of 18% and a specific gravity of soil solids as 2.7. Calculate: 1. The hydraulic conductivity of the soil in cm/sec. 2. The seepage velocity during the test 3. The maximum exit hydraulic gradient If a dam is founded on this soil. Take a desired factor of safety of 3 against piping.arrow_forwardIn 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.arrow_forward
- The hydraulic conductivity of a soil sample (3.4 x 10-4 cm/s) has been determined via a permeability test. The water temperature was 28°C at the time of experiment. What is the hydraulic conductivity of the sample at the standard temperature of 20°C?arrow_forward1. During Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil. Liquid limit tests: Number of Moisture blows, N content (%) 14 38.4 16 36.5 20 33.1 28 270 Plastic limit tests: Students conducted two trials and found that PL = 172% for the first trial and PL = 17.8% for the second trial. a. Draw the flow curve and obtain the liquid limit. b. What is the plasticity index of the soil? Use an average value of PL from the two plastic limit trails.arrow_forward(e) A soil profile consists of a clay layer between layers of sand, the water table being in theupper sand layer. Before the construction of a raft foundation for a large reservoir, piezometers were placed in the saturated clay layer. The whole process of filling the reservoir may be approximated to applying rapidly a single pressure increment of 200 kPa uniformly throughout the clay layer. One year after filling the reservoir, the piezometers indicated a distribution of excess porewater pressure as indicated in Figure Q-e. Estimate the average degree of consolidation at this time.arrow_forward
- Problem 1: During Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil. Liquid limit tests: Number of Moisture blows, N content (%) 14 38.4 16 36.5 20 33.1 28 27.0 Plastic limit tests: Students conducted two trials and found that PL= 17.2% for the 1st trial and PL = 17.8% for the second trial. Draw the flow curve and obtain the liquid limit. What is the plasticity index of the soil? (Hint: Use an average value of PL) Determine the flow index. Determine the liquidity index of the soil if the in-situ moisture content is 21%, and comment on the probable engineering behavior of this soil.arrow_forwardA constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50 cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%, calculate the average velocity and the seepage velocity. Estimate the hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test. What is the soil type tested?arrow_forwardFor a falling-head permeability test, the following values are given: Length of specimen = 200 mm %3D Area of soil specimen = 1000 mm^2 %3D Area of standpipe = 40 mm^2 Head difference at time t = 0 = 500 mm Head difference at timt t 180 seconds = 350 mm %D %3D Determine the hydraulic conductivity of the soil in x10 4 cm secarrow_forward
- 1. The figure shows layers of soil in a tube that is 100mm x 100mm in cross – section. Water 3. For a constant head laboratory permeability test on a fine sand, the followi is supplied to maintain a constant head difference of 400mm across the sample. The given: hydraulic conductivities of the soils in the direction of flow through them are as follows: Soil k (cm/sec) Porosity, n Length of specimen 300 mm A 1x 10-2 25% Diameter of specimen 200 mm 3х 103 32% Head difference 400 mm C 4.9 x 10-4 22% Volume of water collected in 4 minutes 420 m3 Void ratio of the soil specimen 0.55 Water supply Continuous supply Overflow Constant head difference = 400 mm 400 mm A B -soil. sample 300 mm Porous plate 150 mm 150 mm Horizontal area of soil sample 200 mm 200 mm a. Calculate the equivalent k in cm/sec. a. Compute the coefficient of permeability in cm/sec. b. Calculate the rate of water supply in cm³/hr. b. Compute the discharge velocity in cm/sec. c. Calculate the seepage velocity through soil C…arrow_forwardA falling head hydraulic conductivity test is performed on a sample of soil. 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 %3D • Head difference at time t=180 sec = 12 in a. Find the coefficient of permeability of soil b. Compute the rate of flow of water in the soilarrow_forwardA constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50 cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%, calculate the average velocity and the seepage velocity. Estimate the hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test.arrow_forward
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