Analysis of the Harmfulness of Water-Inrush from Coal Seam Floor Based on Seepage Instability Theory  

作　　者：KONG Hai-ling MIAO Xie-xing WANG Lu-zhen ZHANG Yu CHEN Zhan-qing 

机构地区：[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

出　　处：《Journal of China University of Mining and Technology》2007年第4期453-458,共6页中国矿业大学学报（英文版）

基　　金：Projects 50225414 supported by the National Outstanding Youth Foundation;50574090, 50674087 and 50490270 by the National Natural Science Foundation of China

摘　　要：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 distribu-tion 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 wa-ter-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 cor-respondingly,resulting in the formation of water-inrush channels. Accompanied by the failure of the strata,the perme-ability increased exponentially. In contrast,the non-Darcy flow β factor and the acceleration coefficient decreased ex-ponentially,while the increase in the water-inrush-index was nearly exponential and the harmfulness of water-inrush in the coal mine increased accordingly.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 distribu-tion 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 （RFPA^2D）. 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 wa-ter-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 cor-respondingly,resulting in the formation of water-inrush channels. Accompanied by the failure of the strata,the perme-ability increased exponentially. In contrast,the non-Darcy flow β factor and the acceleration coefficient decreased ex-ponentially,while the increase in the water-inrush-index was nearly exponential and the harmfulness of water-inrush in the coal mine increased accordingly.

关 键 词：coal seam floor harm of water-inrush water-inrush-index seepage instability rock strata 

分 类 号：TD163[矿业工程—矿山地质测量]