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The article deals with the problem of determination of zones induced by excavation of underground work in solid granitoid rocks using numerical modelling under the assumption of Hoek-Brown's failure condition and DiederichsпїЅs conceptual model of behaviour of the rock environment around the underground work. Three fundamental induced zones around the underground work are characterized - the High Damage Zone (HDZ), the Excavation Damage Zone (EDZ) and the Excavation Influence Zone (EIZ) and the possibilities of th...