Metodologia para análise da confiabilidade estrutural de escava？？es em rocha

a methodology for rock-excavation structural-reliability analysis that uses distinct element method numerical models is presented. the methodology solves the problem of the conventional numerical models that supply only punctual results and use fixed input parameters, without considering its statistical errors. the analysis of rock-excavation stability must consider uncertainties from geological variability, from uncertainty in the choice of mechanical behaviour hypothesis, and from uncertainties in parameters adopted in numerical model construction. these uncertainties can be analyzed in simple deterministic models, but a new methodology was developed for numerical models with results of several natures. the methodology is based on monte carlo simulations and uses principles of paraconsistent logic. it will be presented in the analysis of a final slope of a large- dimensioned surface mine.