![]() ![]() It is possible to correlate GSI to RMR (Rock Mass Rating) value using variety of correlations available in the literature. This value is usually determined on the field based on the tunnel or slope faces, boreholes or outcrops. GSI is a number between 0-100 that defines the weathering or joint degree of a rock mass. If required samples are not found, point load tests can also be performed and the results of these tests can be converted to UCS using various correlations. In field, the intact samples are selected to be tested in UCS test. Uniaxial compressive strength is the compressive strength of intact rock. Additional inputs are required to estimate rock mass modulus or equivalent Mohr-Coulomb parameters. There are 4 main input parameters for Hoek-Brown material model. Hoek-Brown model is published in Hoek & Brown (1980) and after that, it is constantly updated. The Hoek-Brown material model is the most widely used rock mechanic model due to its simplicity and ease-of-use in continuum based numerical models such as finite element or finite difference models. What it does: Performs Hoek-Brown analyses for rock and recommends additional parameters based on the inputs. I have just published a new tool and this post will detail the methods that are being used in this tool.
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