浅埋综放L工作面开采方法及其矿压实测研究

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Abstract Based on the conditions of #16 coal seam of Lutian coal mine，a new mining method adopting the roadway layout with L-shape is proposed and carried out successfully. The caving characteristics of the top coal and roof，the working resistances of the powered support，the subsidence and collapse rules of the ground surface，the backfill and the roller compaction technology and the other aspects of the fully-mechanized top coal caving for the shallow-buried thick coal seam are studied by field observation. The evolution of the roof rupture and collapse is analyzed. The mechanical model of arch and step voussoir beam combination is established. The movement law of overlying strata and the crushing mechanism of the top coal are revealed；and the powered support resistance formula for controlling roof stability is put forward. The study results show as follows：(1) The mining method of L-shaped working face is a kind of method with high efficiency，safety and high recovery；it is a meaningful reference to outcrop mining or transition from open-pit to underground mining. (2) It is feasible in technology to use fully-mechanized sublevel caving mining for the shallow-buried thick coal seam under the appropriate mining conditions. (3) The periodic weighting step distance increases with the increasing thickness of overlying strata. (4) The periodic weighting is obvious in the middle of working face. (5) The subsidence and collapse of the ground surface can be divided into 4 stages；the backfills and the roller compaction should be divided into 2 stages. (6) In order to enhance the stabilities of the roof and the coal wall，it is essential to increase the initial supporting force of powered support. The results can be referred for further studies in similar conditions.

Key words： mining engineering shallow-buried thick coal seam roadway layout with L-shape mining method fully-mechanized sublevel caving mining underground pressure characteristics

Received: 19 July 2010

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http://www.rockmech.org/EN/Y2011/V30/I2/244

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