... ABSTRACT: Underground mine pillars are typically supported using rockbolts, wire mesh, shotcrete liners, or a combination of these methods to enhance stability and maintain their load-bearing capacity. The design of these supports is generally based on field experience, which is often site...

... ABSTRACT: In the design of room-and-pillar mine systems, the loading capacity of the pillar is equally as important as the stability of the roof and walls to preserve safe working conditions and commercial ore productivity. The optimized design of pillars requires an assessment...

... tomography. geologist reservoir geomechanics hypocenter plate tectonics reservoir characterization increment structural geology geological subdiscipline seismicity block 22 intersection csm hazard proceedings pillar hypothesis figure tomography interaction sweden correlation...

... ABSTRACT: Pillar strength determination is a fundamental aspect of room-and-pillar mine design. Pillars are left between excavated rooms to maintain stability by restraining the hanging wall. In a typical mining environment, pillars of different rock mass conditions and geological...

... ABSTRACT: The process of modelling and design of a yielding pillar is a common necessity in rock mechanics as applied to deep underground mines. There are numerous reasons to design a pillar to yield. A large-scale example would be the convergence of two mining fronts, with the goal...

... casing deformation is to use a cementing alternative by leaving production casing uncemented. This paper presents three mine-by cases in which shale gas wells were in the chain pillars and the production casings were uncemented. These cases represent mine-by scenarios under shallow, medium, and deep...

... kaiser operation fracture progression international conference pb2 single-wall displacement redistribution mpbx instrument pillar ARMA 24 481 Integrating stress fracturing and bulking monitoring for deformation-based ground support design calibration in a deep caving operation Primadiansyah...

... from shale gas wells located in the gateroad chain pillar of the Pittsburgh coal seam longwall operation. The longwall panels adjacent to gas well chain pillars operate at a depth of approximately 313 meters, with a mining height of 2.1 meters and panel widths ranges between 450 to 480 meters. The gas...

... strategy is a norm in the deep gold South African mines. The rockburst phenomenon is driven by various factors, including mining depth, rockmass conditions, geological structures, and mining elements (e.g., abutments, pillars, etc.). In recent years, research has been increasingly addressing the global...

... ABSTRACT: Roughly 29% of fatalities in underground stone mines have been associated with roof and pillar collapses from the beginning of 2002. The S-pillar software can assess how a significant joint set intersecting a pillar impacts the pillar's stability, but the approach doesn't account...

... shown potential. This study aims to develop a novel burst risk assessment tool for individual coal pillars in a longwall gate-road system (LGS). A modified pillar-specific BPI (mBPI) is proposed and couples analytical indices with numerical modeling. The modified index expands the classic BPI...

... ABSTRACT: Spalling of pillar ribs is a major hazard in the mining industry. Developing effective support guidelines requires an understanding of pillar damage mechanisms as well as the rock-support interaction. Bonded Block Models (BBMs) represent a convenient tool for this purpose...

... operation deformation mudrock rock type reservoir characterization geological subdiscipline abutment pillar longwall abutment pillar interface proceedings conference subsurface deformation shale gas pillar overburden geology pittsburgh seam excavation clastic rock complex reservoir...

... Safety and Health (NIOSH) initiated a project to better understand the causes of these massive collapses and reduce/eliminate their future occurrence. Previously the authors investigated one of these massive collapses and it was found that pillar failure was the most likely cause for the collapse...

... ABSTRACT: The Merensky (MER) orebody in the Bushveld Complex in South Africa has been mined extensively. Regional and local pillars, zones of unmined ground, potholes, and remnants were left in-situ. 15 to 400 m beneath the MER orebody, the UG2 chromitite orebody is currently being exploited...

... geometry (pillars, abutments, and back-areas); while 24% were located near known geological structures (faults, dykes). INTRODUCTION As the depth of underground mining increases, the stresses in the rock mass increase, and as a result, the level of induced seismicity usually increases. Mine seismicity...

... ABSTRACT Underground stone or hard rock mines typically employ the room-and-pillar mining method. Room-and-pillar mines are designed in traditional patterns with square or rectangular shaped pillars. This method is favorable because the symmetric pattern aids in optimizing mining operations...

... of the roof and floor, and the plastic zone distribution. We find that the shallow-hole room-pillar method with anchor roof protection has poor pillar stability, while the filling method is more stable, lastly. Our results offer valuable insights into efficient phosphate ore mining practices and provide...

... the ore blending strategy in the ore pass systems to mitigate the ore spill hazard in the ore flow systems. To overcome this dry: wet muck ratio problem, an option for pillar recovery to increase the dry muck tonnages was evaluated. Pillar recovery strategies along the major pillar apexes in inactive...

... ABSTRACT Over the past decades, many pillar strength relationships have been formulated from empirical observation of stable and failed case histories. These empirically derived equations are still widely adopted as a general technique for estimating pillar strength and simplified methods...