SCOPE OF THE TEST
The objective of this test is to determine the strength of cylindrical rock specimens subjected
to triaxial compression. From the results of this test the values of internal friction and
cohesion of the rock material can be calculated.
APPARATUS USED
a) A triaxial cell body in which the specimen may be placed in order to apply the
confining pressure.
b) Both bearing plates shall be equipped with a spherical seat. The centres of curvature
of the spherical seats must coincide with the centres of the end faces of the specimen.
c) A flexible jacket to prevent the hydraulic fluid from entering the specimen. It shall be
sufficiently rigid, so as not to enter surface pores.
d) A testing machine of sufficient capacity and capable of applying controlling and
measuring the axial load at a rate conforming to the requirements described in the test
procedure. The steel platens with which the specimen is loaded shall consist of
hardened steel (specifications see ASTM and ISRM) and be at least as large, but
preferably not more than 2 mm larger than the diameter of the specimen. The
spherical seating of the testing machine (if present) shall be removed or placed in a
locked position.
e) A hydraulic pump and oil pressure gauge, capable to maintain and measure the
confining oil pressure with an accuracy of 2%.
Instructor: Dr. Radhakanta Koner, Department of Mining Engineering, IIT(ISM) Dhanbad
Students: MTech students of Mining Engineering, IIT(ISM) Dhanbad
Course Name: Geomechanics Practical (MNC505)
Session: 2020-21, Monsoon
Acknowledgment
Prabhat Kumar Mandal
Krishna Murari
Birju Gope
Vijay Karanga