Research on the Underground Pressure Behavior Law of Repeated Mining Working Face under the Gob of Small Colliery

Abstract:

The gob of small colliery has been one of the main factors threatening the safe production of coal mine. The repeated mining working face in a certain mine is the practical engineering background in this paper to study the influence of gob in small colliery on the mining of lower layer. By using the numerical simulation software FLAC^3D, the stress distribution law and the change of displacement during lower layer mining were analysed. It can be concluded from the analysis of field measurement data that: there is stress relief under the gob of small colliery because the distribution of coal is irregular resulting from the random distribution of gobs in small colliery, while the residual coal causes the effect of stress concentration on the lower layer mining; relatively large displacement appears in the caving zone of the upper layer by the roof of working face and the support should be strengthened appropriately during mining; meanwhile, the gob of small colliery can cause the nonuniform distance of periodic weighting in the roof, and segmented pressure behavior can be observed during the periodic weighting of the working face. Research results could provide some guidance to the safe and efficient production in repeated mining working face in the mining with similar conditions.

• Periodical: Applied Mechanics and Materials (Volumes 522-524)
• Pages: 1434-1440
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.522-524.1434
• Online since: February 2014
• Authors: Chun Xiang Hu, Jin Kai Liu*, Qi Li, Yong Zhang
• Keywords: FLAC^3D, Gob of Small Colliery, Numerical Simulation, Stress Concentration

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