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Optimization of powder factor, fragmentation and oversized boulders through subsystem studies in an opencast coal mine | ||
| International Journal of Mining and Geo-Engineering | ||
| مقاله 9، دوره 57، شماره 2، شهریور 2023، صفحه 195-203 اصل مقاله (2 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/ijmge.2023.346294.594986 | ||
| نویسندگان | ||
| Pijush Pal Roy* 1؛ Chhangte Sawmliana2؛ Rakesh Kumar Singh2 | ||
| 1CSIR-Central Institute of Mining & Fuel Research, Dhanbad, India. | ||
| 2Rock Excavation Engineering Department, CSIR-Central Institute of Mining & Fuel Research, Dhanbad, India. | ||
| چکیده | ||
| The massive deposit of medium-grained, white-colored sandstone of about 20 m thick, is located immediately above the coal seam in Quarry No. 2, resulted lesser yield due to lower powder factor (m3/kg) and over-sized boulder formations, specifically from the stemming zones at Chotia Opencast Coal Mine of M/s Prakash Industries Limited, which was operating at a depth of about 30 to 40 m with an average bench height of 5.5 m. The criticality of the problem led to the rectification of the blast design parameters through incorporation of pilot holes and pocket charges, decked charges, air-decking, evolution of static energy distributions, and fragment data analysis for establishing optimized design patterns with available machinery. Several test blasts along with on-site testing of explosive quality, rebound hardness tests of overlying strata, and rearrangements of firing patterns through surface delay connections were considered for adopting the best-suitable blast pattern for the mine. Generalized and perceptible inferences were made to apply the results in other mines with similar kinds of problems. | ||
| کلیدواژه‌ها | ||
| Fragmentation؛ Pilot holes؛ Pocket charge؛ Air-decking؛ Static energy distribution | ||
| مراجع | ||
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[10] Singh, M. M. (1991). Field investigations on the effect of structural discontinuities on rock blasting. Unpublished Ph.D. Thesis, IT, Banaras Hindu University, Varanasi, 180.
[11] CSIR-CIMFR Report of Investigations (2013). Scientific study at Chotia opencast mine of M/s Prakash Industries Limited for better fragmentation, reduction of boulder formation and improvement in powder factor. Project No. CNP/3624/2013-14, India, June, 34.
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