The influence of geological structures – an often-overlooked but important aspect affecting the stability of operating mines

摘要

The stability of slopes and underground excavations is generally affected by the geological structure of the rock mass,and it is important that this factor is adequately assessed.Whether instability will arise from the presence of the structures depends on the tectonic events that resulted in the formation of the structure,the orientation,characteristics(width,infill,strength,ability to dissipate strain energy,etc.),and the effect of mining-induced stress on the structure,which either enhances or reduces stability.Three case studies are presented where the influence of geological structures resulted in major instability in Southern African and Canadian underground mines.One case resulted in changes to the mining layout and support system,one resulted in a support system change,and the third resulted in the collapse of the mine,necessitating redevelopment and sterilization of ore.