This paper presents a review of the estimation of rock mass strength properties through the use of GSI. The GSI classification system greatly respects the geological constraints that occur in nature and are

Figure 1 illustrates the data flow when using the GSI/Hoek-Brown method for estimating the parameters required for a numerical analysis of underground or surface excavations in rock.

Geological Strength Index (GSI) was introduced by Hoek and Brown (1997) as a quantitative method to relate field observations to the rock mass quality (Fig. 1).

The Geological Strength Index (GSI) system, proposed in 1994 by Evert Hoek, is used for the estimation of the rock mass strength and the rock mass deformation modulus. The GSI system concentrates on the description of two factors, rock structure and block surface conditions.

Aug 29, 2016 · There are several methods which define GSI but a general international standard has not been specified yet. Our aim is to analyze different methods of GSI determination on the basis of...

The criterion now incorporates both intact rock and discontinuities, such as joints, characterized by the geological strength index (GSI), into a system designed to estimate the mechanical behaviour of typical rock masses encountered in tunnels, slopes and foundations.

Knowledge of the rock mass strength is required for the design of many engineering structures in or on rocks. GSI system, proposed by Hoek et al. (1995), is now widely used for the estimation...

between GSI chart ratings and calculated GSI values based on RMR rock mass classification data. The paper presents linear equations for estimating GSI from measured RMR89 values. Correlations between a and b constants were analyzed for different rock types, at surface and subsurface settings.

This paper presents a proposed quantification of the GSI chart on the basis of two well-established parameters - Joint Condition and RQD. Recommendations for future development of more robust scales are presented.

Jan 1, 2025 · In this study, a series of equations for the calculation of a GSI value on the original GSI lines are derived based on two axes, i.e. rock mass structure and surface properties of discontinuities.