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.

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

Mar 4, 2016 · It provides data from four different rock masses to extend the case history offered by Hoek et al. (2013) in their paper that proposes to quantify GSI with RQD and the joint condition rating of RMR.

Jan 1, 2025 · Although a well-known spacing of joints has generally negative exponential statistical distribution, Hoek et al. (2013) assigned the boundary values of RQD/2 by using a range of 10% for the rock mass classes defined in the basic GSI chart.

Several investigators have attempted to quantify the Geological Strength Index (GSI) chart, with the latest modification of the chart (2013) utilizing RQD as a measure of blockiness.

Original GSI chart from Hoek and Brown (1997). This paper discusses the Geological Strength Index (GSI). It provides data from four different rock masses to extend the case history offered by...

Aug 24, 2020 · The numeric value of the GSI is estimated from the quantified diagonal lines ranging from 10 to 80 and having an interval of 5. The quality of rock mass is divided into five categories and four rock mass structure domains. The basic GSI chart is presented in Figure 2.

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.

It provides data from four different rock masses to extend the case history offered by Hoek et al. (2013) in their paper that proposes to quantify GSI with RQD and the joint condition rating of...