... selection and formulation richard šňupárek procedia engineering 191 mining gallery mathematical model extraction Reservoir Characterization drilling fluids and materials strength factor seam metals & mining excavation major principal stress pillar drilling fluid formulation calculation...

... Abstract A first attempt of using the Room and Pillar mining method in the Czech Republic was implemented in the southern part of the Upper Silesian Coal Basin. This stratigraphical unit is well known for its complex geological structure with more than 40 main coal seams vertically distributed...

... opinions on the mechanism of different types of rockburst in the specific geological conditions in the Upper Silesian Coal Basin. Geomechanical methods comprising destress drilling, destress blasting and seams watering as well as geophysical methods of rockburst prediction and prevention are presented. All...

... surface defor- mations. The monitoring analysed in this paper is at a coal mine situated in the Leon District of north- western Spain. It is a large-scale open-pit excavated in a sequence of alternating lutites, sandstones, and seams of coal. Pit slopes heights range from 100 m to 350 m, with individual...

... Abstract Stress concentration and rockburst risk in coal mine are associated with the occurrence of competent strata in overburdened coal seams. Benches of sandstone and conglomerate are difficult unbreakable and a high level of elastic energy is stored there. It can be released as a rockburst...

... Abstract Based on experience, measurements and stress analyses, the authors have developed and implemented guidelines for stress control in multiple seam mining layouts. Mining sequence in deep coal areas of EWMC is in descending order. Measurements in the lower seam have confirmed yielding...

... Abstract If coal seams are mined by longwall mining, the original stress balance in the rock mass is changed. The stress increases around the mined-out area. As a result, increased stress causes compression around the excavation. The compression around the excavation is shown by exact...

... of competent adjacent rocks in the roof of the seams and incomplete seam extraction in the overburden, cause irregular stress distribution in the rock mass and stress overflow in those regions with the highest stress concentration. Destress blasting in overlying competent rocks is a very important rockburst...

... subsidence sandstone cohesive strength Reservoir Characterization collie basin seam subsidence Misich pillar pillar design coal pillar 717 Rock Engineering in Difficult Ground Conditions Soft Rocks and Karst Vrkljan (ed) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-80481-3 Pillar...

... for mining of the inclined seams (angle more then 20 degree) for the depth more then 300 m. Induced seismic-ity is the best tool for detection and control stability of underground openings. metals & mining september 2006 seam seismic event ground surface deviation mining method Upstream Oil...

... number of rock bursts dates back mainly to seventies of XXieth and it is COnnected with advance of coal winning (especially In Karvina part of coalfield) into the area of thick ~oal seams (exceeding 2.5 m) with interseam positions Onned by rigid sandstone strata and by layers of silt- stones...

... reservoir geomechanics eastern part prediction Reservoir Characterization coal seam technical assessment metals & mining Upstream Oil & Gas structural geology concentration rock massif Coal Basin stress state determination OKR seam characteristic rockburst risk knowledge...

... ABSTRACT Problems of stress-strain states of a rock mass during coal exploitation by using the method of longwalling are still assessed prevailingly on the basis of the classification of rocks occurring in the effective hanging wall of the seam. It has been proved that it is also the main roof...

... ABSTRACT: A very complex failure took place at an open-pit coal mine in the eastern Turkey. The floor of the open-pit heaved up as a result of the buckling failure of the coal seam and a combined form of shear and sliding failure of slope benches occurred. The investigations showed that a weak...

... joint was not appreciated. The second was longwalling underneath highly stressed pillar remnants on an overlying seam and through a pre-mined, backfilled dyke. This attempt, although characterised by higher risk than the first example, succeeded. It is concluded that, in mining, what is predicted...

... & mining Efficiency experiment operational safety measure Upstream Oil & Gas extraction stability operational safety seam model experiment rrodel engineering activity equivalent model cross-section rockburst reservoir simulation Machalek laboratory shaft Research Mining Institute...