Question

In vacuum method, the ground surface is subjected to unbalanced atmospheric pressure.

(a) True

(b) False

I have been asked this question in an internship interview.

I would like to ask this question from Drainage and Dewatering topic in chapter Drainage and Dewatering of Geotechnical Engineering I

Answer 1

Right answer is (a) True

Easiest explanation: Vacuum pumps are used to create a vacuum in the sand filling. When the vacuum is drawn in the well point, the ground surface is subjected to unbalanced atmospheric pressure.