Question

The equivalent penetration resistance is given by ___________

(a) Ne=15+\(\frac{1}{2}\)(N+15)

(b) Ne=\(\frac{1}{2}\)(N-15)

(c) Ne=15+\(\frac{1}{2}\)(N-15)

(d) Ne=15+\(\frac{1}{2}\)(N)

I got this question in exam.

Enquiry is from Geophysical Methods topic in section Stabilisation of Soils, Site Investigation and Sub – Soil Exploration of Geotechnical Engineering II

Answer 1

Correct option is (c) Ne=15+\(\frac{1}{2}\)(N-15)

Easiest explanation: Terzaghi and Peck have recommended the use of equivalent penetration resistance Ne instead of observed penetration values of N, When N is greater than 15.

Ne=15+\(\frac{1}{2}\)(N-15).