Volume 2, Issue 1 — Year 2025 — Article e100033

Maryam Nazari¹; Shahrzad Alivand²; Fariba Alizadeh³

1. Department of Geology, Shiraz University, Shiraz 7194684334, Iran
2. Department of Geology, University of Isfahan, Isfahan 8174673441, Iran
3. Department of Mining Engineering, Urmia University, Urmia 5756151818, Iran

Quantifying rock mass conditions is essential in rock mechanics, providing critical insights into quality, strength, and durability. Rock mass classification systems, developed primarily through empirical and experimental studies, serve as vital tools for assessing geotechnical properties. These systems are especially crucial in slope stability analysis, aiding in evaluating structural integrity and guiding the design of reliable stabilization strategies. Among these systems, the Geological Strength Index (GSI) is widely regarded as a robust method for classifying rock masses. Developed by Prof. Hoek and his colleagues, GSI evaluates the geological and geomechanical characteristics of rock masses based on structural and material properties. Its global adoption across engineering and geotechnical projects highlights its reliability and versatility. This study applies GSI to evaluate slope rock mass behavior and its engineering implications. Field investigations were conducted at 12 sites west of Shiraz city as part of a highway development project to analyze the stability of roadside slopes. A comprehensive survey included 24 of Uniaxial Compressive Strength (UCS), point load, Schmidt hammer tests, all aimed at determining the mechanical properties of the rock masses. The collected data were processed using the GSI system, enabling the classification of slope rock masses and the identification of key engineering geological characteristics. The findings offer valuable insights into the stability and geomechanical behavior of the slopes, forming a foundation for reliable design and effective stabilization strategies. This approach underscores the importance of GSI in slope stability assessments.

Rock mass classification, Slope stability, Geological strength index, Geotechnical engineering, Rock mechanics