Question

The use of bore guide in under-reamed pile foundation is essential for __________

(a) To drill the bore hole

(b) To provide a support to the pile

(c) To keep the bore holes vertical

(d) To set the guide assembly in position

This question was posed to me by my college professor while I was bunking the class.

This interesting question is from Construction of Under-Reamed Pile Foundation topic in section Pile Foundations of Geotechnical Engineering II

Answer 1

The correct answer is (c) To keep the bore holes vertical

Best explanation: The used of boring guide is essential in order to keep the bore holes vertical and also in its position.