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5. A falling head permeameter was used to determine the permeability of a sandy-clay soil sample...
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...
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
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?
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...
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...
Subject: Geotechnical Engineering (soil mechanics). Q3. A sand sample of 35 cm2 cross sectional area and...
Subject: Geotechnical Engineering (soil mechanics).
Q3. 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 gm, and Gs = 2.68. Determine (a) the hydraulic conductivity in cm/sec, (b) the discharge velocity, and (c) the seepage velocity.
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...
*need the uplift force Problem 5 Consider the flow net shown below. The sandy soil has...
*need the uplift force
Problem 5 Consider the flow net shown below. The sandy soil has an average saturated unit weight of 20 kN/m and permeability of 0.002 cm/s. Numbers provided are elevations from the interface with the impervious layer. The other "set" of numbers counts the number of head drops. (a) Compute the distribution of pore water pressure acting along the base of the concrete weir, and determine the vertical uplift force that the water pressure exerts on the...
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...
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
Subject: Geotechnical Engineering (soil mechanics).
Q3. 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 gm, and Gs = 2.68. Determine (a) the hydraulic conductivity in cm/sec, (b) the discharge velocity, and (c) the seepage velocity.
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...
*need the uplift force
Problem 5 Consider the flow net shown below. The sandy soil has an average saturated unit weight of 20 kN/m and permeability of 0.002 cm/s. Numbers provided are elevations from the interface with the impervious layer. The other "set" of numbers counts the number of head drops. (a) Compute the distribution of pore water pressure acting along the base of the concrete weir, and determine the vertical uplift force that the water pressure exerts on the...
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