Analysis of the Harmfulness of Water-Inrush from Coal Seam Floor Based on Seepage Instability Theory |
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Authors: | KONG Hai-ling MIAO Xie-xing WANG Lu-zhen ZHANG Yu CHEN Zhan-qing |
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Affiliation: | 1. School of Sciences, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;2. Yancheng Institute of Technology, Yancheng, Jiangsu 224003, China;3. Xuhai College, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;4. School of Resources & Geoscience, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China |
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Abstract: | A theory of seepage instability was used to estimate the harmfulness of water-inrush from a coal seam floor in a particular coal mine of the Mining Group, Xuzhou.Based on the stratum column chart in this coal mine, the distribution of stress in mining floors when the long-wall mining was respectively pushed along to 100 m and to 150 m was simulated by using the numerical software (RFPA2D).The permeability parameters of the coal seam floor are described given the relationship between permeability parameters.Strain and the water-inrush-indices were calculated.The water-inrush-index was 67.2% when the working face was pushed to 100 m, showing that water-inrush is possible and it was 1630% when the working face was pushed to 150 m, showing that water-inrush is quite probable.The results show that as long-wall mining is pushed along, the failure zone is enlarged, the strain increased, and fissures developed correspondingly, resulting in the formation of water-inrush channels.Accompanied by the failure of the strata, the permeability increased exponentially.In contrast, the non-Darcy flow β factor and the acceleration coefficient decreased exponentially, while the increase in the water-inrush-index was nearly exponential and the harmfulness of water-inrush in the coal mine increased accordingly. |
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Keywords: | coal seam floor harm of water-inrush water-inrush-index seepage instability rock strata |
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