Field Dataset for GSI-RMR_adj Correlation in Central Alborz Rock Masses

This dataset contains 134 field observations of Geological Strength Index (GSI) and Adjusted Rock Mass Rating (RMR_adj) from three lithological formations (Elika, Lar, and Shemshak) in the Central Alborz region, Iran. Data was collected from Golbini & Zo and Tange Gazi mines. The dataset supports the development of an empirical correlation between GSI and RMR_adj for rock mass characterization.