Stress-strain state of solid coal during shield extraction of thick inclined seams

Autor: Yu. E. Borisov, G. S. Kuzin, L. S. Sen'ko, L. P. Tomashevskii, V. K. Aksenov
Rok vydání: 1976
Předmět:
Zdroj: Soviet mining science. 12:319-323
ISSN: 1573-8736
0038-5581
DOI: 10.1007/bf02594878
Popis: Since the fifties, attempts have been made in the Kuzbass to work thick inclined seams by pillars to the dip using shield supports, including shields of streamlined and parabolic form on rollers, tracks, etc. However, owing to technical imperfections, malfunctions, and low efficiency, the supports tested have not found extensive practical use. To improve both operational safety and performance, the Kuzbass Scientific-Research Coal Institute, working in conjunction with the Tsentral'naya Colliery, has developed and introduced SK shield supports for use in seams 3-6 m thick with a dip of 40-55/sup 0/. On the basis of these investigations the following conclusions may be drawn. According to the hydraulic gage readings, the zone of abutment pressure due to the previously worked shield pillar extends for 24-26 m along the seam strike with a maximum near the worked-out area. The abutment pressure zone ahead of the shield pillar extends for 28 m to the dip and reaches a maximum at the center of the width of the shield pillar. The overall stress field due to the previously and presently worked shield pillars has a maximum at the boundary of the worked-out area. Data on the stress distribution in solid coal have been usedmore » to develop facilities for mechanized coal extraction in a shield face by a machine of the frontal attack type (conveyerized plow) operating in the zone of completely extruded coal with a low breakage energy.« less
Databáze: OpenAIRE
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