4. For a variable head permeability test, the following are given: Length of soil specimen 200 mm Area of soil specimen 1000 mm2 Area of standpipe 40 mm? Head difference at time t = 0 500 mm Head difference at time t = 3 min 300 mm Continuous supply 500 mm 300 mm -Area of stand pipe = 40 mm2 L-200 mm -Porous plate Area of sod sámple = 1000 mm? a. Compute the hydraulic conductivity of the soil in cm/sec. b. Compute the seepage velocity if the porosity of soil is 0.25. c. What was the head difference at time, t = 100 sec.
4. For a variable head permeability test, the following are given: Length of soil specimen 200 mm Area of soil specimen 1000 mm2 Area of standpipe 40 mm? Head difference at time t = 0 500 mm Head difference at time t = 3 min 300 mm Continuous supply 500 mm 300 mm -Area of stand pipe = 40 mm2 L-200 mm -Porous plate Area of sod sámple = 1000 mm? a. Compute the hydraulic conductivity of the soil in cm/sec. b. Compute the seepage velocity if the porosity of soil is 0.25. c. What was the head difference at time, t = 100 sec.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
![4. For a variable head permeability test, the following are given:
2. A borehole at a site reveals the soil profile shown. Assume Gs = 2.70 for all soil types.
Length of soil specimen
200 mm
Area of soil specimen
a. What is the unit weight of the soil in layer 1 in kN/m³?
1000 mm?
Area of standpipe
b. What is the effective stress at a depth of 2m below the ground surface, in kPa?
40 mm?
Head difference at time t = 0
c. What is the effective stress at a depth of 20.6m below the ground surface, in kPa?
500 mm
Head difference at time t = 3 min
300 mm
Elevation (m)
Continuous
supply
Very fine wet sand with silt
w = 5%, S = 40%
Layer 1
2.0
Fine sand saturated by
capillary action
Layer 2
3.0
500 mm
- Fine sand, w = 12%
Layer 3
5.4
300 mm
-Area of stand pipe.
= 40 mm2
L=200 mm
icimple
-Porous plate
Soft blue clay, w = 28%
Layer 4
Area of soil sámple
= 1000 mm?
a. Compute the hydraulic conductivity of the soil in cm/sec.
b. Compute the seepage velocity if the porosity of soil is 0.25.
20.6
c. What was the head difference at time, t = 100 sec.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F59fef605-66f3-484c-966a-5256631a9a27%2Fa73c5410-c70c-4320-aeb9-58fc0996eced%2Fyfrtc8_processed.png&w=3840&q=75)
Transcribed Image Text:4. For a variable head permeability test, the following are given:
2. A borehole at a site reveals the soil profile shown. Assume Gs = 2.70 for all soil types.
Length of soil specimen
200 mm
Area of soil specimen
a. What is the unit weight of the soil in layer 1 in kN/m³?
1000 mm?
Area of standpipe
b. What is the effective stress at a depth of 2m below the ground surface, in kPa?
40 mm?
Head difference at time t = 0
c. What is the effective stress at a depth of 20.6m below the ground surface, in kPa?
500 mm
Head difference at time t = 3 min
300 mm
Elevation (m)
Continuous
supply
Very fine wet sand with silt
w = 5%, S = 40%
Layer 1
2.0
Fine sand saturated by
capillary action
Layer 2
3.0
500 mm
- Fine sand, w = 12%
Layer 3
5.4
300 mm
-Area of stand pipe.
= 40 mm2
L=200 mm
icimple
-Porous plate
Soft blue clay, w = 28%
Layer 4
Area of soil sámple
= 1000 mm?
a. Compute the hydraulic conductivity of the soil in cm/sec.
b. Compute the seepage velocity if the porosity of soil is 0.25.
20.6
c. What was the head difference at time, t = 100 sec.
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