Question

What is not true about unconfined test?

(a) It is also called tri-axial test

(b) The specimen has no lateral support

(c) The specimen has no lateral restraint

(d) It is also called uniaxial test

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

My question comes from Rocks as Materials for Construction in section Engineering Properties of Rocks of Engineering Geology

Answer 1

Right answer is (a) It is also called tri-axial test

The explanation: The load at failure divided by the area of cross-section of the sample gives the unconfined compressive strength of the rock. The value is termed unconfined or uniaxial because the test specimen has no lateral support or restraint and is being compressed only along one axis.