Abstract
Rock Mass Index (RMi) is proposed to characterize rock mass strength as a construction material. As the rock mass index, RMi, is meant to express the compressive strength of a rock mass, a calibration of the same is necessary. The uniaxial compressive strength of intact rock, qc is defined and can be determined within a reasonable accuracy. The jointing parameter (Jp), however, is a combined parameter made up of the block volume, Vb that can be found from field measurements, and the joint condition factor, jC, which is the result of three independent joint parameters. Results from large-scale tests and field measurements of rock mass strength are used to determine the ways by which Vb and jC can be combined to express the jointing parameter, Jp. The calibration is performed using known test results of the uniaxial compressive strength and the inherent parameters of the rock mass.
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