... pillar strength and stresses. The models were based on experience obtained in South African coal mines which practise bord and pillar mining. 2.0 DIMENSIONS OF BARRIER AND INTERPANEL PILLARS Bord and pillar workings are usually separated by a continuous rib pillar which is referred to as a barrier...

...SOME INVESTIGATIONS INTO THE SURFACE MOVEMENT DUE TO UNDERGROUND MINING BY BORD AND PILLAR METHOD Mesures des tassements en surface causes par les exploitations rnlnieres "en chambre et pilier» Einige Untersuchungen der Qberflachenbewegungen infolge Bergbaus nach der Pfeilermethode Professor R.D...

... picture of induced stresses is one of alternating compressive and tensile zones above and below the pillars and the boards respectively. The qualitative picture of stress distribution on the roof of the seam is depicted in Figure 1. reservoir geomechanics bord south african colliery pillar...