Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > The constant head permeability test is used f...
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The constant head permeability test is used for___________
- a)Fine-grained soil
- b)Coarse-grained soil
- c)Clay soil
- d)Saturated soil
Correct answer is option 'B'. Can you explain this answer?
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The constant head permeability test is used for___________a)Fine-grain...
Coarse-grained soil, for which a reasonable discharge can be collected in a given time, is used in constant test.
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The constant head permeability test is used for___________a)Fine-grain...
Constant Head Permeability Test for Coarse-Grained Soil
Constant head permeability test is used to determine the permeability of coarse-grained soils. This test helps in understanding how easily water can flow through the soil under a constant hydraulic gradient.
Principle of the Test
In this test, a constant head of water is maintained on one side of the soil specimen while the other side is open to flow freely. The rate of flow of water through the soil is measured, and the permeability of the soil is calculated using Darcy's law.
Procedure
- A soil sample is placed in a permeameter with a constant head of water on one side.
- The flow rate of water through the soil sample is measured over a period of time.
- The head loss across the soil sample is also recorded.
- The permeability of the soil is calculated using the formula Q = k * A * (h/L) where Q is the flow rate, k is the permeability, A is the cross-sectional area of the soil sample, h is the head loss, and L is the length of the soil sample.
Advantages of Constant Head Permeability Test
- It is suitable for coarse-grained soils with high permeability.
- It provides a quick and accurate measurement of permeability.
- It is a simple test to perform in the laboratory.
Conclusion
Constant head permeability test is an important test for determining the permeability of coarse-grained soils. By understanding the flow of water through the soil, engineers can make informed decisions about the design and construction of structures on or with coarse-grained soils.
Constant head permeability test is used to determine the permeability of coarse-grained soils. This test helps in understanding how easily water can flow through the soil under a constant hydraulic gradient.
Principle of the Test
In this test, a constant head of water is maintained on one side of the soil specimen while the other side is open to flow freely. The rate of flow of water through the soil is measured, and the permeability of the soil is calculated using Darcy's law.
Procedure
- A soil sample is placed in a permeameter with a constant head of water on one side.
- The flow rate of water through the soil sample is measured over a period of time.
- The head loss across the soil sample is also recorded.
- The permeability of the soil is calculated using the formula Q = k * A * (h/L) where Q is the flow rate, k is the permeability, A is the cross-sectional area of the soil sample, h is the head loss, and L is the length of the soil sample.
Advantages of Constant Head Permeability Test
- It is suitable for coarse-grained soils with high permeability.
- It provides a quick and accurate measurement of permeability.
- It is a simple test to perform in the laboratory.
Conclusion
Constant head permeability test is an important test for determining the permeability of coarse-grained soils. By understanding the flow of water through the soil, engineers can make informed decisions about the design and construction of structures on or with coarse-grained soils.
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The constant head permeability test is used for___________a)Fine-grained soilb)Coarse-grained soilc)Clay soild)Saturated soilCorrect answer is option 'B'. Can you explain this answer?
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