Question

For pile foundations, the depth of exploration at the start of the work is _________

(a) 10 meters

(b) 40 meters

(c) 70 meters

(d) 200 meters

The question was posed to me in an internship interview.

My enquiry is from Site Exploration in division Stabilisation of Soils, Site Investigation and Sub – Soil Exploration of Geotechnical Engineering II

Answer 1

Correct answer is (a) 10 meters

To explain I would say: The depth of exploration at the start of the work or the significant depth, for pile foundation, should be 10 to 30 meters, or more, at least one and a half times the width of the structure.