... the occasional fall of rocks and debris on the highways is diverted by hanging cliff or rock cover, the construction design of these structures is purely based on experience. The problem add-on when an expansion in span or height is desired in existing roads. This paper summarizes the stability study...

.... Specific attention is given to methods for characterizing crown rockmasses to account for major geological structures that historically have led to adverse deformation behaviour, and in some cases to failures. 1. INTRODUCTION Although the empirical Scaled Span method for surface crown pillar stability...

... spectrum correlation coefficient Artificial Intelligence correlation span tunnel lining tangential direction fractal dimension ARMA 19 XXXX Evaluation method for rigidity of tunnel concrete lining based on its vibration characteristics Tetsuya Taniguchi West Nippon Expressway Engineering Kyushu...

... and refinement of the empirical back stability assessments conducted by Golder Associates and the Doe Run Company. 1.0 INTRODUCTION data mining information stability stope back failure pillar extraction back stability erf max blanket area assessment span probability metals & mining...

... structure current support system roofbolt safety tendon support ground condition productivity excavation Thickness plane evaluation classification support system research area discontinuity span probability ARMA 18-677 Evaluation of tendon support in anisotropic jointed rockmass Chikande...

..., the discrete element method (DEM) is adopted to depict the fracture processes of the CCNSCB specimens considering different supporting spans and heterogeneity. Our results demonstrate that the crack front of the CCNSCB specimen with any loading condition is prominently curved, which violates the straight...

... of this released elastic energy is a source of seismic energy. Upstream Oil & Gas gravitational potential energy roof strata expression metals & mining cantilevered case strain energy beam deflection strata fracture Reservoir Characterization Thickness normal stress span built-in beam...

... stability span investigation support unit stope support design support resistance excavation installation Thickness support strategy instability pillar safety ARMA 17-1022 Review of stope support design for a shallow platinum mine: A Bushveld Complex case study Kgwete, M.N and Zvarivadza, T...

... researchers. This study involved successfully instrumenting and mining a 13.7 m (45’) wide undercut below a 4.6 m (15’) thick layer of backfill. This particular study will differ from the previous in that the wide spans will be left open for an extended period of time. This drift will eventually...

... Abstract Any bord and pillar platinum mine thrives on effective design of bords and pillars. Pillars have to be large enough to ensure safety and small enough to ensure economic and sustainable exploitation of the mineral resource. Consideration of span of the bords of the working area...

... ABSTRACT The limiting relationship between underground opening span and required cover height for stability in blocky rock masses, characterized by a network of horizontal bedding planes and vertical joints, is explored here. Understanding this relationship is crucial for the design of mining...

... ABSTRACT: There are 7 locations where the rock cover is significantly less than the tunnel spans on the CLEM7 Tunnel (formerly known as the North South Bypass Tunnel) in Brisbane, Australia. The twin highway tunnels are each approximately 5 km long with wide on and off ramps at both ends...

... from collapses of near-surface workings have plagued mining operations for years led to the development nearly 20 years ago of the Scaled Span empirical design guidelines for crown pillar rock thickness dimensioning. This paper presents an updated methodology and a new chart developed through use...

... ABSTRACT: Since longhole stoping under CRF is uncommon, the optimum CRF span for longhole stoping is not well known. The optimization of CRF spans will help maintain safe working conditions, minimize ore dilution from CRF, and reduce overall CRF placement. Mining operations commonly have...

... ABSTRACT: Since the commencement of mining at Tau Lekoa Mine in 1991, large FOG have been problematic. Crush pillars are used to prevent these and the current layout is based on an empirical relationship between the fallout thickness and pillar span. Crush pillar and the spans are designed...

... reservoir geomechanics Upstream Oil & Gas orientation strength modeling dimension failure mode block corner investigation geometry span excavation joint orientation different value rock mass Ground Support distinct element parametric study RMR value guideline friction angle ARMA...

.... The three new Murray data sources were consistent and suggested that substantially lower rock mass quality and higher variability existed in much of the Murray ore body. Reductions in stope spans and adjustments in extraction/backfilling sequences would be required for application of sublevel stoping...

... cave weak rock span excavation Ground Support full overburden pressure numerical model construction tunnel dome California Rock Mechanics in the National Interest, Elsworth, Tinucoi & Heasley (eds), © 2001 Swets & Zeitlinger Lisse, ISBN 902651 827 7 Design and construction of a large...

... ABSTRACT: This paper discusses the results of the analysis of drift spans under cemented rockfill in underhand cutand-fill mining, and the implementation of the resulting recommendations to increase the spans. The increased spans have allowed substantial increases in mine productivity...

... of the extremities of such a sequence when it approaches and then undermines the structures to be protected (edge effects). The first requirement is fulfilled by keeping the pillar center below a specific fraction of the mining depth. The second criterion is met by specifying a small enough span for the panels...