Rock mass properties - Rocscience Inc.
coefficient of determination 2 r are calculated from: n x ... The influence of sample size upon rock strength has been widely discussed in geotechnical literature and it is generally assumed that there is a significant reduction in strength with increasing sample size. Based upon an analysis of published data, Hoek and
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www.rocscience.comHoek and Brown [1, 2] introduced their failure criterion in an attempt to provide input data for the analyses required for the design of underground excavations in hard rock. The criterion was derived from the results of research into the brittle failure …
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Rock mass classification - Rocscience Inc.
www.rocscience.com1. Rock mass classification Introduction During the feasibility and preliminary design stages of a project, when very little detailed ... general tunnelling approach known as the New Austrian Tunnelling Method. ... - 3.3 Jv (1) where . J.
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