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Identify the Method used for the dewatering of the foundation trenches. (a)Vacuum system

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Identify the Method used for the dewatering of the foundation trenches.

(a) Vacuum system

(b) Single stage system

(c) Multi stage system

(d) Pumping

I got this question by my college director while I was bunking the class.

Asked question is from Deep Excavations topic in division Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

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The correct choice is (a) Vacuum system

The explanation is: The vacuum process is very much useful and effective for inorganic and organic silts and very fine sand. But several weeks may be required to achieve consolidation by this method.

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