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Keywords: seam
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Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-528
... ABSTRACT: Since the middle of 1980Õs, the longwall top-coal caving technique has developed rapidly in China. At present, it is one of the main approaches in the thick coal seam mining. This paper describes some mechanics problems of the caving technique, such as the damage and failure of the...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-549
...EFFECTS OF SEAM THICKNESS VARIATIONS ON THE RISK OF ROCK BURSTS Vladimír Petro 1 2 ABSTRACT In spite of considerable efforts of geomechanic surveillance in individual hard-coal mines within the Ostrava-Karviná basin, dangerous rock bursts still occur. Active preventive measures that should...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-497
... Gippsland Sedimentary Basin (Gloe, 1974). The deposits are thought to be around 15 to 40 million years old of Tertiary age. The Latrobe Valley Depression ranges in depth up to around 700m and the sediments consist of brown coal seams, clays and semi-consolidated to unconsolidated silts, sands, and gravels...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-624
..., typically via a series of parallel entries driven to a significant depth within the seam horizon. The method allows recovery of coal from surface pits that have reached final highwall position due to uneconomic stripping ratios, or in areas where coal has become sterilized in, for example, service corridors...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-038
... failed. It was then concluded that the pillars in a previously mined bord and pillar panel in a lower seam had failed. Further analyses indicated that progessive pillar failure could take place, which would seriously jeopardize the stability of the main gate. When underground observations indicated that...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 21–24, 1981
Paper Number: ISRM-IS-1981-134
... of coal, the excavation of coal seams with faults under bottom of sea, etc. For analyzing such problems by computer, we assume an elastic-collapse model with artificial plasticity and applied Prof. kawai's Rigid Body Spring Model (RBSM) (kawai 1980). In the RBSM coal seams or rock strata are...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 21–24, 1981
Paper Number: ISRM-IS-1981-217
... thick siltstones and minor labile sandstones. The sandstones occur as thin beds within siltstones or more persistent bands up to 1 m thick. Up to three coal seams are developed in the present open pit areas. The upper seam (Aries or A Seam) is of increasing economic importance down-dip but only remnants...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 21–24, 1981
Paper Number: ISRM-IS-1981-059
... SUMMARY In many cases gravity dams must be constructed on complex multilayered rock foundations, which consist of consecutive layers of mudstone, argillaceous silt stone and sand stone. These layers are in many cases separated by thin interbedded seams of clay, which may be continuous or...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 21–24, 1981
Paper Number: ISRM-IS-1981-136
... INTRODUCTION Economically significant Permian coal Seams have been formed in different Portions of the Sydney Basin, New South Wales, a linear molasse trough situated between a cratonized foreland (Lachlan Fold Belt) to the west and a mobile hinterland (New England Fold Belt) to the northeast...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 21–24, 1981
Paper Number: ISRM-IS-1981-147
... coalfield roof rock seam roof shale Upstream Oil & Gas colliery seam metals & mining Thickness taltore seam roof Reservoir Characterization strength roof shale sandstone shale roof India plane raghunathbati seam roof fall seam roof shale specimen jamuria 7...
Proceedings Papers

Paper presented at the ISRM International Symposium, October 23–24, 1973
Paper Number: ISRM-IS-1973-026
... Summary The mining and geological conditions are characterized. There is also presented the method of mining the coal seams under the roofs composed of rigid sandstones and conglomerates by strike longwall system with strip packing of the stone worked in the roof or floor of the longwall face...
Proceedings Papers

Paper presented at the ISRM International Symposium, October 23–24, 1973
Paper Number: ISRM-IS-1973-031
... maintenance of the longwall workings. metals & mining load-bearing capaoity face support operation diagram whioh immediate roof strata cohesive roof strata model test seam root strata rock mass Prop construction longwall face roof strata solid coal strata functional relationship...

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