How to estimate rock mass tensile strength by considersing the scale effects？With use of the generalized hoek-brown criterion,estimating the GSI value,then set sig1=sig3 and compute the rock mass tensile strength , is this ok? the generalized hoek-brown criterion is based on a lots of compression tests, is it reasonable to estimate the rock mass tensile strength by set sig1=sig3 in hoek-brown criterion? if not , how to estimate rock mass ts?
Everything depends on your task. From the point of view of large-scale effect, I would test for a bend a large number of samples from different places of the rock (more than 50 samples) and would take the minimum size of strength. It is possible to take the 3 sigma, but it is represented to me that values will be underestimated in that case.
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