THE STABILITY OF ROCKY MASSIVES

SUMMARY Until today, the verification of rocky massive's stability was appanage only for geologists who know manipulate a compass and a clinometer, and can to take up the differents net-work of a rocky massive's discontinuty and, by help of WULF diagramme, decide of his stability or no stability, after cutting's earth-work for example. When the Morrocco has throwed the project of line rain-way between Marrakech and Laâyoune, the most importante town in Sahara, we have been aware that the WULF method was too slow to study the 1100 km of way, across the vange of Haut-Atlas, the footinghill of the Anti-Atlas and the valley of Sahara. Wenbinded to make in computer the method, and for this, we must resolve analyticly the probleme. The objectif of this article is to explicite this resolution.