... geology reservoir characterization extraction castlegate sandstone operator strength maleki university book cliff coal field blackhawk formation maleki 2014 upstream oil & gas metals & mining gateroad seam rock canyon seam Rock Mechanics for Natural Resources and Infrastructure...

... filling. One of the important factors that control this behavior is the claystones. However, as movements are concentrated on some subhorizontal seams, it is suggested that movements have resulted from the horizontal swelling of overlying claystones and/or low sliding resistance along seams, both...

... could be used entirety by mining enterprises. Furthermore, the situation becomes more complex due to the trend to increase the depth of coal seams mining with complex geological structure and uneven spatial changes in the thickness and strength. In such circumstances, the issue of timely forecasting...

... seam. The extensive scientific studies are carried out which included field data collection, joint mapping and rock mass characterization etc. Also study included observation of the failure pattern at the site and the laboratory testing on the various types of rock cores obtained from the drilled...

... shear displacement river wellbore design knowledge management displacement reservoir geomechanics interface bracket stability evaluation opencast mpa strength boundary gopinathpur ocp simulation bhattacharjee bedding plane seam khudia river Rock Mechanics for Natural Resources...

... metals & mining strength seam mechanical property wellbore integrity 13th international congress discontinuity MPa Reservoir Characterization mathey coal specimen database compressive strength South Africa sample data rock mechanics isrm13 Wellbore Design confinement...

... seismic velocity metals & mining old working seismic imaging pillar coalfield seam subsidence seismic image Drilling Australia void case study coal pillar Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8...

... ABSTRACT Rockburst is a very dangerous phenomenon in mining. Destress blasting is one of the active methods of rockburst control. The effect of destress blasting is manifested in two ways: it relieves stress in the forefield of the longwall face due to failure of the coal seam immediately...

...Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 A new method on extraction of two thick seams simultaneously on extremely difficult ground condition a case study C.N. Ghosh, Prashant, P.K. Mandal, John Loui P...

... ABSTRACT Exxaro Resources Limited's Matla Colliery situated in Mpumalanga, South Africa operates two shortwall faces on the N° 4 and N° 2 Seams. In the past, severe strata loading events have lead to serious facebreaks resulting in safety threats as well as considerable production losses...

... Abstract From the viewpoint of interaction mechanics of solid and gas, a coupled mathematical model is presented for coal/rock mass deformation and gas leak flow in parallel deformable coal seams. Numerical simulations for the prediction of the safety range of mining of protection layer...

... A running facebreak ahead of the powered support units occurred on the number 4 seam at Matla Coal's number 3 shaft (Matla 3) in April and May 2002.Very difficult mining conditions were experienced for a distance of some 150 m in the tailgate and to a lesser extent on the face itself. The paper...

.... The coal reserves, suitable for extraction by opencast mining, are dwindling. Underground coal mining is, relatively, eco-friendly and can be practiced for even deeper coal seams. To meet the increasing demand of coal, large number of coal seams has extensively been developed on bord and pillar. In fact...

... In late 1997 a request was received to assist with determining the powered support unit (shield) load capacities for the planned 2 seam short wall. This project had a number of aspects which made it attractive to utilize numerical modelling in conjunction with other more conventional design...

... of the mechanisms and stress levels involved in bursting is needed to help develop improved stress control design and burst mitigation methods. The geology of the area is notoriously burst-prone. The coal has poorly developed cleating and occurs in multiple seams that are often bounded by very strong roof and floor...

... the sedimentary rock mass overlying the mined coal seam, or from the coal seam itself. The source of the gas would provide a basis for assessing the likely duration of gas release at the surface. The study was approached through discrete element modelling and comparison with field measurement of in situ stress...

... & mining longwall gateroad deformation support system stability analysis seam borehole pressure cell tail gate bed separation Stability,analysis of longwall gateroad using' observational approach ~ \ t 1 ~ Analyse de la stabllite d'une voie de longue taille a I'aide d'observations en place...

... in question and the rock bursts caused by redistribution of stresses in rock massif with the focus area far from the excavated seam, usually in a long distance in the overburden. Both types of rock bursts are continuously analysed, Some examples of typical cases and the factors, which influence...

... of confinement they provide to the coal seam. Numerical modelling results are used to demonstrate this and for comparison. Resume La conception des piliers de soutenement dans les mines de charbon a toujours entraîne des techniques empiriques fondees sur L'experience acquise, plus recemmement en association...

... 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 occured. The investigations showed that a weak...