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Rampura Agucha mine is exploiting the world’s largest Pb-Zn deposit and is currently in progress of transitioning from open cast to underground mining. Underground ore access development is primarily developed through foliated strata of a moderate strength which pose many challenges. Rock mass response in foliated ground depends on several factors including in-situ stress conditions, orientation of excavation with respect to foliation planes, excavation geometry and blasting practices. Presented study utilizes a numerical code FLAC3D and ubiquitous joint constitutive model to gain insights into excavation stability in a foliated rock mass. Historical observations of drives damage and measurements from geotechnical instrumentation were utilized to calibrate the numerical models. A comprehensive conceptual modeling study was carried out to analyze the rock mass failure mode due to varying inter-plane angle between foliation strike and excavation walls and depth of excavation. Modeling results were summarized into a quantitative damage classification scheme which is being used by the mine geotechnical department to predict rock mass response, depth of failure around excavation, ground support and rehabilitation requirements. Keywords—foliated rock mass, excavation stability, numerical modeling, ubiquitous joint and damage classification scheme.

Influence of foliation on excavation stability at Rampura Agucha underground mine