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- W2941019134 abstract "The paper presents an estimation of the effectiveness of long-hole destress blasting during longwall mining of the upper layer of coal seam No. 504 in one of the hard coal mines in the Polish part of the Upper Silesian Coal Basin. The estimation was based on the seismic effect method. The exploitation in concern proceeded under variable geological and mining conditions, mostly in the rock mass destressed by an earlier exploitation of the coal seam No. 506 (approx. 15-38 m below), under the influence of the edges of coal seams No. 418 and 502 (approximately 99-104 m and 30-52 m above) and near the diagonal fault with a throw of 110 m. The results have been compared with the seismic effects of the long-hole destress blasting executed during earlier longwall mining of the coal seam No. 506 in this area. The influence of extraction of the coal seam No. 506 on the stress level reduction was estimated according to the seismic effect method. Similarly, the manner in which the edges in coal seams No. 502 and 418 had an impact – despite the rock mass relaxation effect – on the stress level increase during longwall mining of the upper layer of coal seam No. 504, has been determined." @default.
- W2941019134 created "2019-05-03" @default.
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- W2941019134 date "2019-04-26" @default.
- W2941019134 modified "2023-09-24" @default.
- W2941019134 title "Analysis of stress level during longwall mining of a coal seam with the use of seismic effect method" @default.
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- W2941019134 doi "https://doi.org/10.1088/1755-1315/261/1/012057" @default.
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