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Keywords: seam
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Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-080
... is chosen for this study. Each finite element model consists of a longwall face, barrier pillars, gateroads, adjacent two longwall panels in which one panel is completely goaved out and another remains virgin, goaf of the working panel, coal seam, and other coal-bearing strata. This research considers...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-082
... bottom (GP bottom) seams. Table 1 shows the details geo-mining parameters of the OCP. From the borehole sections, as shown in Figure 2, it is obtained that the parting between the Gopinathpur top and bottom seams are sandstone. The interface between the sandstone and the shale exists at the level...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-033
... 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...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-167
..., normative documents do not provide clear instructions on geodynamic zoning, which 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...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-154
... 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...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-274
... impact the stability of gate roads and violent failure of gate pillars. The 26-ft (7.9-m) wide gate pillars in Mine 2 proved ineffective in controlling roof-floor convergence under weaker near seam strata conditions and deep cover exceeding 2,500-ft (760-m). However, unlike Case Study 2, the experience...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-007
... Merwe 1 THE MECHANICAL PROPERTIES OF SOUTH AFRICAN COALS ABSTRACT We present an analysis of the mechanical properties of coal specimens from various coalfields and seams in South Africa. Our database comprises of 1800 test results from uniaxial and triaxial compression tests, as well as indirect tensile...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-205
... 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...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-219
... 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...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-272
... ABSTRACT In Indian coal mines, blasting gallery method of extraction has emerged as a very successful method of extraction for thick seams above 7m. The paper deals with an innovative technology where two seams were extracted simultaneously with the upper seam by blasting gallery method...
Proceedings Papers

Paper presented at the 11th ISRM Congress, July 9–13, 2007
Paper Number: ISRM-11CONGRESS-2007-221
... 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...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-118
... 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...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-188
.... 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...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-221
... 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...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-202
... 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...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-068
..., and accumulations In the Southern Coalfields region of New South Wales, the Cata- of ignitable gas at the river banks. These problems motivated a ract River gorge penetrates to a depth of70 m from level ground, multidisciplinary study, a key objective of which was to identify overlying the Bulli coal seam...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-058
... extensometer colliery gateroad pump pack load cell observational approach point borehole extensometer Thickness borehole extensometer extraction metals & mining longwall gateroad deformation support system stability analysis seam borehole pressure cell tail gate bed...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-218
... structural geology rock massif longwall face metals & mining Thickness Coal Basin Reservoir Characterization concentration seam Redistribution conclusion excavation data mining colliery Czech part OKR karvina part tectonic structure pillar rock burst stress concentration...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-265
... are attributed to variations in the roof and floor strata and in the degree of confine- ment they provide to the coal seam. Numerical modelling results are used to demonstrate this and for comparison. . I t, I I Resume '; I ' I ." (. + ~ ,1 La conception des piliers de soutenement dans les mines de charbon...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-051
... has poorly developed cleating and occurs in multiple seams that are often bounded by very strong roof and floor sandstone/siltstone beds. The overburden is formed by thick, competent strata with numerous sandstone channels. This geology and deep cover are the major source of high stresses, causing...

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