Etude de la sensibilite d'une methode d'analyse a la rupture des piliers de surface des mines souterraines.

摘要

Stability analysis have been done using imaginary data which compare with crown pillar characteristics of the Canadian Shield. The analysis was conducted using the Papantonopoulos (1979) method, adapted by Fortin (1987) for crown pillars. This method takes into account both the stresses acting on the crown pillar and the dissipation of these stresses through geological discontinuities.; The results indicate that there is a critical pattern of instability (S.I.P.) that can lead to instability when the minimisation of the factor of safety is equal to zero. The results also indicate that the stresses which are applied by the rock mass on the pillar have a stabilising effect on the pillar. The most important factor that influences the stability is the magnitude of the horizontal stresses applied on the internal boundary of the model.; The Papantonopoulos method is not as safe as the P.S.M. method but, it is safer than the results obtained by the analysis done in elastic, homogeneous and continuous media. (Abstract shortened by UMI.)