Analyse de l’instabilité par flambage des couches à la mine de Grand-Baume, Charbonnages de France

Abstract

RésuméLa communication décrit un mécanisme de flambage des couches rocheuses qui pourrait se produire le long du flanc ouest de la mine à ciel ouvert de Grand Baume au moment où la profondeur maximale d'exploitation sera atteinte. AbstractThe paper describes a three hinge strata buckling mechanism and its influence on the west wallof the Grand-Baume open pit coal mine. The analysis is exten ded to investigate the stability at the projected maximum depth of the pit.In order to study and quantify the failure mechanism, two analysis methods were employed. The first method used the base friction table on which scale models of the slope were represented. The second method made use of the mathematical modelling of the slope stability by means of a limit equilibrium computer program, specific to three hinge strata buckling.Details on the application and the results of the two methods are presented. These are henceforth compared with the field observations at the Grand-Baume mine.