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What is the recommended value of CNS thickness to be used for lining over expansive soil with swelling pressure of 200-300 KN/m^2?

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in Irrigation Engineering by (75.2k points)
What is the recommended value of CNS thickness to be used for lining over expansive soil with swelling pressure of 200-300 KN/m^2?

(a) 75 to 85 cm

(b) 90 to 100 cm

(c) 105 to 125 cm

(d) > 125 cm

The question was asked in class test.

Query is from Lining of Canals in Expansive Soils in portion Lining of Irrigation Canals and its Economics of Irrigation Engineering

1 Answer

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by (106k points)
The correct answer is (b) 90 to 100 cm

Easiest explanation: For swelling pressure ranging from 50-150 KN/m^2, the value of CNS thickness varies from 75 to 85 cm and for swelling pressure 200-300 KN/m^2, the value is 90 to 100 cm. The CNS thickness is more for more expansive soil and less for less expansive soil.

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