... the stresses in the rock mass and that small deformations along an existing shear zone can cause significant instabilities in the surrounding rock mass resulting in an increase in the size of the cavity. Supporting of the rock mass and backfilling of the cavity with materials having a Young's modulus of larger...

... Abstract Backfill as a substitute of ore body can reduce the ground subsidence and transfer the stress of surrounding rock mass. It was most important to keep the backfill stable in mining activities. Past decades, many researchers analyzed the stability of backfill considering it as block...

... Abstract In this paper, formulas are proposed for rational and realistic sizing of barricades made of development waste rock as cemented paste backfill retaining structures in underground mining operations. The formulas, which take into account the application or not of shotcrete, allows...

.... The data collected over a period of five years, when different support types were used, indicated that cemented backfill reduces the closure rate substantially. This reduces the amount of seismicity per area mined according to earlier work done in the industry. As a drawback, the backfill increases...

... Abstract A small-scale model stope of a longitudinal mine prototype stope was used to study the geomechanical behavior of waste rock barricades for retaining the cemented paste backfills within the model stope. This study aims at assessing the potential instabilities of the waste rock...

... backfilling experiments were conducted as well as the degree of backfilling. The results indicate the joint geometry (dip angle) has adverse effects on the pillars strength. It was further realized that the effects of joint inherent properties are less pronounced on the joint dip angles perpendicular...

... contribute to higher strength development of the Gelfill samples. KEYWORDS Gelfill, Cemented Hydraulic Fill, Sodium Silicate, MIP, Mine Backfill, Mixing Time INTRODUCTION The increased depths of mines in the Canadian Shield and the high stress associated with these depths favour a new method of mine backfill...

... Abstract In this paper, the compressive strength and failure patterns of reinforced cemented paste backfill (CPB) were studied aiming to promote the stability of backfilled stopes. The concept of ductile backfill was proposed and a series of unconfined compression tests were carried out...

...Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 Post-closure hydromechanical behaviour of a backfilled cavity N. Dufour & H. Wong Université de Lyon, Département Génie Civil et Bâtiment, Ecole Nationale des Travaux...

... of the panel collapses that occur on the face area of the UG2 panels mining underneath the Merensky pillars. Inelastic numerical modelling was performed to determine if the use of backfill could improve this extraction ratio and at what depth below surface it is required. tensile failure Reservoir...

... of a Deepmine project. Upstream Oil & Gas risk estimator application metals & mining event magnitude layout structural geology extraction evaluation backfill threshold value mining layout technology roadmap pillar Reservoir Characterization geological model Rock mechanics plane...

... not adequately represent the heterogeneity of the rockfill resulting from aggregate segregation when the rockfill is placed (Reschke, 1993). This problem can be addressed by placing instruments in the rockfill to measure mining-induced stress and strain. As part of a safety and stability assessment of backfill...

... considers the stope design methods, the dilution due to hanging wall instability, its impact on economics. cablebolt support stability backfill metals & mining dilution access development production rate stope economics graphitic shear mining method instability ore secondary stope...

... Rock mechanics optimine pillar stress extraction pillar shear displacement Reservoir Characterization mining area technology roadmap geological structure option 3 backfill remnant pillar evaluate risk 713 Le Bron, K.B. et al. The application of Optimine to evaluate risks associated...

... deformations to be accommodated by the shaft steelwork designs. The option chosen was a combination of strategically placed satellite pillars and yield pillars, and backfill. Following the mining of a small inner cut during the shaft sinking process, full-scale mining is progressing away from the shaft...

... profitability. In July 2000, a strategy to deliver support by pipeline was outlined1. This proposed making use of the backfill systems present on many of AngloGold's South African mines to deliver a variety of underground support systems by pipeline. This was a continuation and expansion of the Pack in a Pipe...

... is into the mountain slope. The overburden varies between 0 m and 1,000 m. The mining method employed is post pillar mining with uncemented backfill. The pillars are rectangular in cross-section with a width of ~5 m and a length of 15 m. In a first step a 7 m high opening at the deepest point of a mining area...

... excavations; condition of tunnel support elements due to corrosion; siting of tunnels; ineffective gully support; shape of remnant pillars and poor backfill usage. An important aspect of the project, in addition to the rockburst investigations themselves, is the measurement of excavation skin response...

... of up to 1 km or more have taken place. The majority of large events are associated with slip on the faults. However, where mining takes place close to dykes, large events also occur, frequently of magnitude 3 - 5. Reservoir Characterization elastic closure mining method backfill data mining...

... strength waste storage waste management Engineering contribution constraint Proc Disposal post-mining use advantage result backfill excavation AIME preparation transportation utilization New York Post-mining use of underground space for waste storage Nutzung stillgelegter Bergwerkstollen...