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________ type of cofferdam is economical at places where rock is available in plenty.(a) Earth dikes(b) Sand-bags dikes(c) Rock-fill cofferdam(d) Single wall cofferdamI had been asked this question during an internship interview.I need to ask this question from Cofferdam and Caisson in chapter Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

Answer»

Correct OPTION is (c) Rock-fill cofferdam

Easiest EXPLANATION: Rock dikes or Rock-fill cofferdams can be used for a depth of water up to about 3 METRES and a suitable even in case of Swift water. The only disadvantage of this type of cofferdam is that it is not IMPERVIOUS.



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