Abstract:
Various correlations have been established with regard to rock
strength indices for different types of rocks around the world. In Sri Lanka,
having several types of sedimentary and metamorphic rocks, least attempt has
been made in relation to the particular subject area. In order to fulfil the need to
a certain extent, this research was carried out to study correlations between rock
strength indices specifically in Sri Lankan gneissic rocks. The study reveals
information with regard to an emerging, yet powerful rock strength index
known as Block Punch Index, which could be used with same significance as
that of Point Load Index, while predicting Uniaxial Compressive Strength. The
study further compares the strength indices and their variations in relation to
size effect. It finally presents conclusions drawn relating to strength indices of
Sri Lankan gneissic rocks with several recommendations.
