The following data are for falling-head test performed at 25⁰C Temperature: Length of the soil sample...
The following data are for falling-head test performed at 25⁰C Temperature:
Length of the soil sample = 40 cm
Area of the soil sample = 78,54 cm2 Diameter of the standpipe = 1.1 cm
At time t=0 head difference = 54 cm
At time t=8 min, head difference = 22 cm
a) Determine the permeability of the soil
b) What was the head difference at t=4 min?
Homework Answers
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The following data are for falling-head test performed at 25⁰C
Temperature:
Length of the soil sample...
Problem 3. For a falling-head permeability test, the following are given: Length of soil spec imen...
Problem 3. For a falling-head permeability test, the following are given: Length of soil spec imen 500 mm Area of the soil specimen 16 cm Area of the standpipe 0.97 cm2 Head differences at time t 0 is 760 mm Head differences at time t 8 min is 410 mm a) Determine the hydraulic conductivity of the soil b) What was the head differences at time t 5 min
In a laboratory, a falling-head permeability test was conducted on a silty soil. For the falling-head...
In a laboratory, a falling-head permeability test was
conducted on a silty soil. For the falling-head apparatus, the
following data were obtained:
1. Length of Specimen = 15.80 cm.
2. Diameter of Specimen = 10.16 cm.
3. Cross-sectional area of burette = 1.83 cm2
4. Hydraulic head at beginning of test (h1) = 120.0
cm.
5. Hydraulic head at end of test (h2) = 110.0 cm.
6. Time required for water in the burette to drop from
h1 to h2...
5. A falling head permeameter was used to determine the permeability of a sandy-clay soil sample...
5. A falling head permeameter was used to determine the permeability of a sandy-clay soil sample having a cross sectional area of 12.56 cm2 and a length of 18 cm. The cross-sectional area of the permeameter standpipe is 2 cm*. The time during which the level of water in the standpipe ction 22035 TR 0925-1040 NCE 3610 Homework Set 2 Spring 2019 dropped from 100 to 50 cm was 4 minutes. Determine the coefficient of permeability of this material.
Q3 (a) A falling head permeability test was conducted on a soil sample with diameter of...
Q3 (a) A falling head permeability test was conducted on a soil sample with diameter of 76 mm and sample length of 70 mm. The sample was connected to a standpipe of diameter 1.5 mm, where the water level (total head) was measured to drop from 1.56 m to 1.18 m in 65 s. Determine the coefficient of permeability of the soil sample. (b) Explain why it is more preferable to conduct the falling head test, instead of the constant...
Question 1 a) Hydraulic conductivity of soils is an important parameter for the design of engineering...
Question 1 a) Hydraulic conductivity of soils is an important parameter for the design of engineering structures (such as dams, etc.). Why? b) With the help of a fully labelled diagram, derive the expression for the hydraulic conductivity of soil based on the falling-head permeability test. c) The following data was recorded from a falling-head permeability test: Area of the soil specimen = 10 cm Length of the soil specimen = 22 cm Area of standpipe = 0.4 cm2 Head...
Problem 3: A constant-head permeability test was performed on the soil sample shown below. The hydraulic...
Problem 3: A constant-head permeability test was performed on the soil sample shown below. The hydraulic conductivities were 0.04 cm/s for the sand and 0.0004 cm/s for the silt. The cross-sectional area of the sample is 10 cm², of which 9 cm' is sand and the remainder is silt. (a) Plot how the total hydraulic head (expressed in terms of AH) and hydraulic gradient vary along the length of the sample. (b) What would be the hydraulic conductivity (k) for...
B. A constant-head permeability test was run on a soil sample 7.3 em in diameter and...
B. A constant-head permeability test was run on a soil sample 7.3 em in diameter and 14 em long, Q-10 em/min, b-100 em. The soil grains have a dry weight of 985 g, a specifie gravity of 2.7, and a void ratio 0.610. Determine the followings a. The coefficient of permeability. b. The seepage velocity of the soil v. 15 c. The actual velocity v. 4c
Please write correct option after completion of your answer Length of soil sample for constant head...
Please write correct option after completion of your
answer
Length of soil sample for constant head permeability test is 30 cm, Area of specimen is 177cm2 constant head difference is 50 cm, total volume of water collected in 5 min is 350cm Calculate the hydraulic conductivity of the soil. ) 1.09x10 cm/sec )3.95x10cm/sec A) 2.85 x10'cm/sec )1.09x10 cm/sec We were unable to transcribe this imageFind the error in the discharge when a head of water over the crest of a...
A constant-head permeameter has a diameter of 2.5 cm. A 5.0 cm soil sample with the...
A constant-head permeameter has a diameter of 2.5 cm. A 5.0 cm soil sample with the same cross-sectional area is place in the permeameter. When a head difference of 5 cm is applied between the inlet and outlet ports, the permeameter discharges 50 cm3 of water in 90 s. (a) Calculate the hydraulic conductivity of the soil in m/s and in ft/day. (b) What is the intrinsic permeability of the soil at 20 ◦C? (c) What would be the soil’s...
Problem 3. In a constant-head permeability test, the length of the specimen is 150 mm and...
Problem 3. In a constant-head permeability test, the length of the specimen is 150 mm and the cross-sectional area is 3167 mm". If k = 0.062 cm/sec and a rate of flow of 160 cm/min has to be maintained during the test, what should be the head differ- ence across the specimen? Also, determine the discharge velocity under the test conditions.
Problem 3. For a falling-head permeability test, the following are given: Length of soil spec imen 500 mm Area of the soil specimen 16 cm Area of the standpipe 0.97 cm2 Head differences at time t 0 is 760 mm Head differences at time t 8 min is 410 mm a) Determine the hydraulic conductivity of the soil b) What was the head differences at time t 5 min
In a laboratory, a falling-head permeability test was
conducted on a silty soil. For the falling-head apparatus, the
following data were obtained:
1. Length of Specimen = 15.80 cm.
2. Diameter of Specimen = 10.16 cm.
3. Cross-sectional area of burette = 1.83 cm2
4. Hydraulic head at beginning of test (h1) = 120.0
cm.
5. Hydraulic head at end of test (h2) = 110.0 cm.
6. Time required for water in the burette to drop from
h1 to h2...
5. A falling head permeameter was used to determine the permeability of a sandy-clay soil sample having a cross sectional area of 12.56 cm2 and a length of 18 cm. The cross-sectional area of the permeameter standpipe is 2 cm*. The time during which the level of water in the standpipe ction 22035 TR 0925-1040 NCE 3610 Homework Set 2 Spring 2019 dropped from 100 to 50 cm was 4 minutes. Determine the coefficient of permeability of this material.
Problem 3: A constant-head permeability test was performed on the soil sample shown below. The hydraulic conductivities were 0.04 cm/s for the sand and 0.0004 cm/s for the silt. The cross-sectional area of the sample is 10 cm², of which 9 cm' is sand and the remainder is silt. (a) Plot how the total hydraulic head (expressed in terms of AH) and hydraulic gradient vary along the length of the sample. (b) What would be the hydraulic conductivity (k) for...
B. A constant-head permeability test was run on a soil sample 7.3 em in diameter and 14 em long, Q-10 em/min, b-100 em. The soil grains have a dry weight of 985 g, a specifie gravity of 2.7, and a void ratio 0.610. Determine the followings a. The coefficient of permeability. b. The seepage velocity of the soil v. 15 c. The actual velocity v. 4c
Please write correct option after completion of your
answer
Length of soil sample for constant head permeability test is 30 cm, Area of specimen is 177cm2 constant head difference is 50 cm, total volume of water collected in 5 min is 350cm Calculate the hydraulic conductivity of the soil. ) 1.09x10 cm/sec )3.95x10cm/sec A) 2.85 x10'cm/sec )1.09x10 cm/sec We were unable to transcribe this imageFind the error in the discharge when a head of water over the crest of a...
Problem 3. In a constant-head permeability test, the length of the specimen is 150 mm and the cross-sectional area is 3167 mm". If k = 0.062 cm/sec and a rate of flow of 160 cm/min has to be maintained during the test, what should be the head differ- ence across the specimen? Also, determine the discharge velocity under the test conditions.
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