Application of empirical analysis to underground mine a study case In morocco

Abstract

The OUMJRANE mine located in the eastern Anti-Atlas in Morocco, is operating underground mining in various sedimentary rocks from sandstones to shales. During operation, several instabilities are recorded in the underground galleries. The present study represents an empirical characterization based on the classification index of the rock mass: RMR (Rock Mass Rating), Q (Tunnel Quality Index) of the stability of the excavation. The input data used for this analysis were based on fracturing surveys, core logging, and laboratory tests. The results of this study show that the rock mass is of low quality.

Analysis of stability law and optimization of slope angle during excavation of deep concave mine slope

“…However, in the analysis of hard rock pillars and in rock mass models to determine rock mass strength, it is very important to consider the actual stress level and stress path imposed on the pillars due to the excavation sequence of the pillars [ 9 ]. From the perspective of excavation stability, the complex nonlinear mechanical behavior of the combined system of rock and coal that surrounds mine openings is a major obstacle in the excavation, stability, and support design of mining thin coal seams [ 10 – 15 ]. The geological structure of the Changshanhao open-pit mine in Urad Middle Banner, Inner Mongolia, China is extremely complicated, and various slope instabilities have occurred, such as wedge sliding, bedding sliding, and toppling failure.…”