Explain determination of coefficient of permeability by constant head method.

Explain determination of coefficient of permeability by constant head method.
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Procedure of determination of coefficient of permeability by constant head method:

1. Take 2.5 Kg air dried soil sample passing through 9.5mm IS sieve. Add the water in soil equals to its optimum moisture content (OMC) to get required density. 2. Apply grease to inside surface of mould, base plate and collar. Clamp the base plate with extension collar. Fill the prepared soil sample in permeameter in three different layers. Compact each layer using 25 blows using rammer. Remove the collar and trim the excess soil for mould. Remove compaction base plate. Cover the soil with filter paper and porous stones on both sides. 3. Place the mould assembly in the drainage base. Fix the top cap on it using rubber sealing gasket. 4. Connect the inlet nozzle of permeameter to outlet of constant head water tank. Close the air vent of mould. Open outlet of permeameter and allow water to flow in the bottom water tank. Wait for some time to establish steady flow. 5. Measure head causing flow ‘h’. Collect quantity of water (Q) in the measuring cylinder for suitable time interval (t). 6. Calculate the coefficient of permeability of soil as 

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7. Repeat all above steps two more times to get average coefficient of permeability of given soil sample.

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Related questions

Which of the following methods is best suited for determination of permeability of coarse-grained soils? (A) Constant head method (B) Falling head method (C) Both the above (D) None of the above

Description : Which of the following methods is best suited for determination of permeability of coarse-grained soils? (A) Constant head method (B) Falling head method (C) Both the above (D) None of the above

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A sample of soil 10 cm height and 50 cm2 in c/s area water flows through the soil under a constant head of 80 cm. Water collected in 9 minutes is 450 C.C. Find the coefficient of permeability.

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Last Answer : Solution: 

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