Estimation of Rock Block Strength in Veined Materials

Rock Engineering 2009 - Rock Engineering in Difficult Conditions
Megan Gaida, Mark Board, David DeGagne, Diego Mas,
Abstract The intact strength of rock blocks larger than standard core sizes is often of interest. It is well established that the intact strength of rock decreases with increasing scale and a number of researchers have developed quantitative predictive relations based on laboratory testing. The presence of veins within the intact rock complicates the estimation of rock block strength because core samples often exhibit a great deal of scatter in intact strength. In addition, most existing relations are based on unveined materials. This paper describes how rock block strength was estimated for a veined Monzonite through a combination of lab testing at small and large scales, existing empirical relations and Synthetic Rock Mass modeling. The results are used to outline some practical guidelines for estimation of rock block strength in veined materials.
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