Experiment research on hauling pipeline backfilling in the fully- mechanized mining face of thin coal seam and broken roof
Abstract：Aiming at some special characteristics of coal seam in the north Yellow River of where occur the thin bed- rock, thin coal seam, thick alluvium, broken roof with low profit of every ton coal, the dense structure on surface, the large surface subsidence of long-wall caving mining, the conception was put forward to the pipeline hauled backfilling in the caving zone behind mechanized supporter based on comparision and analysis of self-pressure gangue backfilling behind mechanized supporter, similar paste backfilling, super high water backfilling and high separation layer grouting. The conception was put forward to the self-pressure zone of gangue caved, residual bulk factor and time-space mode and technology system of pipeline hauled backfilling, and the experiments was succeeded in the working face according to the mining technology condition of Zhaoguan Coal Mine fully-mechanized face 1703, similar material simulatin test and the compaction degree simulatin test of rural gangue and backfilling gangur. The results show that the pipeline hauled backfilling is successful in the thin seam, broken roof, gentle sloping face, and the supporter is not to be recon- structed ; the expective surface subsidence coefficient is 0.4 according to the amount of mining and backfilling, and the maximum surface subsidence is 50 cm.
Keywords：thin coal seambroken rooffully-mechanized mining facepipeline hauled backfillingself-pressure zone of gangue cavedresidual bulk factor
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 1263-1269 )