... In mining, the design of optimum pillar strength has benefits ranging from increased extraction ratio (economic benefit) to the stability of the hanging-wall (safety benefit). Pillar strength is traditionally determined by empirical calculations and based on square, or near-square, pillar shapes...

... to decommissioning of one of the half-levels (1 South). These upper half-levels contain a reefparallel structure referred to as the Footwall Fault (FwF) which is located either within or below the mining cut. Reef-parallel structures are known to affect pillar strength and have been cited as a major contributor...

... residual strength metals & mining drilling fluid formulation volumetric strain Reservoir Characterization drilling fluids and materials strength drilling fluid chemistry drilling fluid property pillar strength international journal strength envelope evolution pillar behaviour MPa pillar...

... Reservoir Characterization Upstream Oil & Gas structural geology reservoir geomechanics metals & mining footwall bord operation Thickness hangingwall Orebody rock mass condition pillar pillar strength variability MPa shear structure strength hedley evaluation pillar...

... to laboratory testing, as well as Salamon and Munro's empirical pillar strength criterion. The relationship obtained from the initial analysis was then applied to predict potential failure of the irregular shaped pillars created during the stooping operation. INTRODUCTION A project was commissioned...

... The design of support pillar layouts in shallow South African mines has historically been based on comparisons of pillar strength to pillar loading, providing some acceptable factor of safety. For this evaluation of pillar stability, empirical strength formulae were compared to either tributary...