Abstract: The bench slope angle is a eritical structural parameter in the mining of open-pit limestonemines , significantly affecting the mine's safety, stability, and economie benefits. In this study, based onthe new Hoek-Brown strength criterion , the mechanical parameters of the slope were determined as therecommended values for the stability caleulation of the slope rock mass in the open-pit mine. The stabilityof the final end-limit slope was analyzed using FLAc? and Geo-slope software. A comparison and analy.sis of the stability results from the two simulations were performed. Furthermore, considering the lime.stone geological context of the study area, it was ultimately concluded that the final slope angle of theopen-pit bench should be controlled to within 49°, the final bench slope angle should be 65°, the work-ing bench slope angle should be 75°, and the bench height should be 10 meters. The research resultsshowed that the safety factor ( F、) for all open-pit bench slope profiles was greater than 1. 15 , thus meeting the safety grade requirements for Grade lll slope engineering and providing a solid seientific basis andassurance for the safe operation of the mine.

Key words:  , open-pit mine slope , numerical simulation, Hoek-Brown strength criterion