Influence of Driving Direction on the Stability of a Group of Headings Located in a Field of High Horizontal Stresses in the Polish Underground Copper Mines

This paper investigates the problem of stability in a group headings driven high horizontal stress fields copper ore mines Legnica-Glogow Copper Belt (LGCB). The are protected with roof bolting system. is importance due to special safety regulations which apply mining workings serving as airways and haulageways. analysis was performed for four geological conditions Polkowice-Sieroszowice mine. evaluated use Finite Element Method (FEM). parameters rocks used numerical modeling have been determined on basis Hoek–Brown classification, RocLab 1.0 software. field identified situ measurements, were mine 2012. measurements carried out overcoring method, relief method. A CSIRO HI probe measuring device. tests three points, six successful performed. confirmed presence stresses rock mass. Numerical using Phase2 v.8.0 software, triaxial state plane strain state. mass described an elastic-plastic model softening. analyses based Mohr–Coulomb failure criterion. It assumed that optimal measure range formed zone yielded excavation roof. simulations shown direction driving increased may be key LGOM mines. greatest extent occurred when perpendicular maximum component ?H. obtained results served provide example application system protect unfavorable field.