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Which of the following order is correct regarding coefficient of cohesion?

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Which of the following order is correct regarding coefficient of cohesion?

(a) Hard clay < Dense sand > Medium clay > Soft clay

(b) Hard clay > Dense sand > Medium clay > Soft clay

(c) Medium clay > Dense sand > Hard clay > Soft clay

(d) Dense sand > Medium clay > Hard clay > Soft clay

The question was posed to me in exam.

My question comes from Forces and Loads on Sewer topic in chapter Construction of Sewers, Sewer Appurtenances and Sewage Pumping of Environmental Engineering

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Correct choice is (b) Hard clay > Dense sand > Medium clay > Soft clay

The explanation is: The coefficient of cohesion of Hard clay, Dense sand, Medium clay and Soft clay are 4700kg/m^2, 1400kg/m^2, 1200kg/m^2 and 200kg/m^2 respectively.

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