... 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...

...). The open cut Loy Yang Power Mine currently provides more than 30Mt of brown coal to the company's (Loy Yang Power Management Ltd) adjacent 4 × 500 MW power station units, 2 × 500 MW Edison Mission Energy power station units and a small dried coal plant operated by Auschar. The mine is currently 140m deep...

... metals & mining coal adsorption capacity prone coal Upstream Oil & Gas electromagnetic emission outburst prone coal Reservoir Characterization new model mechanism electromagnetic field structural coal electromagnetic response gas outburst coal sample fracture complex...

... ABSTRACT: The highwall mining method was introduced in Australia in early 1991. Since then, at least 13 mines have used this method to mine coal. Abundant experience has been accumulated during the past 8 years, through some failures as well as successes. This paper presents a brief review...

... SPONTANEOUS COMBUSTION IN OPEN-CUT COAL MINING SPOIL PILES: A CHALLENGING LEGACY. John N. Carras 1 and Andrew R. Leventhal 2 ABSTRACT Spontaneous combustion, when it occurs in coal, is a serious issue. In underground coal mines, it poses major safety concerns and active procedures are required...

... metals & mining coal pillar extraction maingate reservoir geomechanics pillar failure site seam lower seam pillar lower seam pillar visual observation Reservoir Characterization pillar failure seam pillar tailgate Sigma Colliery pillar panel bord bottom seam pillar...

... ABSTRACT: The East Rand area of South Africa is underlain by shallow coal workings which were mined many years ago. As a result of their age, and the fact that, at the time of mining, the maintenance of accurate mine plans was not practised, available records are known to be of doubtful value...

... Reservoir Characterization Upstream Oil & Gas material property Wellbore Design criterion metals & mining displacement coal wellbore integrity strong convergence radial stress boundary Houillere convergence mathematical simulation tunnel gallery application underground...

...Rock at Great Depth, Maury & Fourmaintraux (eds), © 1989 Balkema, Rotterdam. ISBN 90 6191 9754 Microseismic monitoring in coal and hard rock under deep cover Controle microsismique du charbon et des roches dures sous couverture profonde Mikroseismische Aufzeichnungen in Kohle und Festgestein unter...

.... These calculations show the influence of the softening behaviour, the residual strength and the volumetric behaviour of the broken rock mass. An example is given of a design calculation for a gallery with assumed elasto'plas~ic behaviour of the coal. The results show that destressing in this situation...

... in situ stresses in both a sub-bituminous coal and an anisotropic schist, and also to monitor stress changes in coal. RESUME: Un appareil de mesure de contraintes basé sur une inclusion souple et creuse est décrit. Cet instrument emploie la technique de relachement du stress par "overcoring". L...

... SUMMARY: This report presents a theoretical analysis of rockbursts. Cracks, internal stresses, heterogeinity and anisotropy are fundamental features of rocks and coals. The influences of high stress concentrations, internal stresses, the conversion of potential to seismic energy, the multiple...

... ABSTRACT: The results of in situ stress measurements made at four sites in the Underground coal mines at Huntly, New Zealand, are presented and discussed. Measurements were made in the coal seam by overcoring a flexible hollow inclusion instrument developed for use in soft, jointed rock...

... SUMMARY This paper describes the time-dependent de formations of a jointed coal. Cylindrical samples of jointed coal were tested under constant triaxial load condition. Based on the results and interpretation of 9 (nine) single-stage creep tests, an empirical stress-strain-time relationship...

...Proceedings of the International Symposium on Weak Rock / Tokyo /21-24 September 1981 Characteristics of spoil pile failures in a strip coal mine in Tertiary and Permian sediments V.U.NGUYEN CSIRO. Mount WaJlerley. Australia T.C.WELSH CSJRO. Rockhampton, Australia ABSTRACT A study of the mechanisms...

...ProLdr inz , Wlodzimierz Sikora Central Mining Institute Katowice COAL ROOF CONTROL SYSTEMS CM1CTEMhI YIIPABJIEHHfl YI'OJIhHhIMH KPOBllflMltT SYSTEMES DE CONTROLE DES TOI TS AU CHARBON 11 VERFAHREN DER KOHLENHANGENDFUHRUNG - 2 - Summary Problem~ of coal roof control occur when mirring thick seams...