Question

The depth of exploration for isolated spread footing is ___________

(a) 1\(\frac{1}{2}\)  the width

(b) 2\(\frac{1}{2}\) the width

(c) \(\frac{1}{2}\) the width

(d) \(\frac{1}{4}\)  the width

I have been asked this question in an international level competition.

I need to ask this question from Soil Samples and Samplers in portion Stabilisation of Soils, Site Investigation and Sub – Soil Exploration of Geotechnical Engineering II

Answer 1

Right choice is (a) 1\(\frac{1}{2}\)  the width

The explanation: The depth of exploration for isolated spread footing is one and a half times the width. While the  depth of exploration is twice the height from stream bed to crest for concrete dams.