Question

The depth of the bore hole is checked at _________ before insertion of the under-reamer.

(a) At the start and At the end

(b) Each time

(c) None of the mentioned

(d) All of the mentioned

This question was posed to me in an interview.

The above asked question is from Construction of Under-Reamed Pile Foundation topic in division Pile Foundations of Geotechnical Engineering II

Answer 1

Right option is (a) At the start and At the end

Explanation: The depth of the bore hole is checked each time before insertion of the under-reamer so that any loose earth spilled from the bucket is removed.