Risk Analysis On The Water Irush Of The 3-2 Coaling Roof And Floor In First Coaling Area Of Qian YingZi Mine

Both of the growth of sandstone crack aquifer on the top and floor of 32 coal seam and water-richness of some part are strong in Qian yingzi mine's first mining area. Besides, both of the growth and water-richness of K3 sandstone crack aquifer in the floor of 32 coal seam reflect a difference. So, the development of 32 coal seam is threatened simultaneously by the sandstone fissure water on the top, the floor of coal seam and the K3 sandstone under floor.Based on consulting domestic and foreign related literatures about the research current situation and related mechanism on the water-inrush problems of the top, floor coal seam firstly, and collecting some geological and hydrogeological information about Qianyingzi mine and the first mining area, this paper recorded 60 drill-hole column information, got core under well and did a indoor test, made a comprehensive evaluation for the coal seam's top and floor's petrofabric character, precipitation character and water-resisting performance, and classified for the type of coal seam's top and floor; drafted a shale/sand ratio isopachous map of 32 coal seam between 40m overlying strata and 30m underlying and a spacing isoline map of the distance between 32 coal seam and K3 sandstone crack; aided by the transient electromagnetic method (TEM) to probe the water-richness of both top and floor on 32 coal seam, combined with theoretical analyses, and then divided areas according to the water-richness of both top and floor, concluded that there were 34 and 31 relative water-richness areas on the top and the floor of coal seam respectively, which reflected a good correlation with ethan match-fixing trials; by using numerical simulation, it found that the maximal depth of 32 coal seam was 15.0m, and by using FLAC3D numerical simulation, it predicted the height of permeable fissure zone was 38.0～45.0m and the height of fissure zone was 13.6～14.8m; on the basis of regulations and rules to calculate the results, it found that the height of caving zone and fissure zone were 11.26m and 41.34m respectively, and made a contrastive analyses with the mining measured data from 32 coal seam of adjacent mine well, and finally it determined the height of caving zone and fissure zone of 32 coal seam respectively. Finally, the hierarchical analysis-fuzzy comprehensive evaluation model was utilized to make a comprehensive analyses and quantitative evaluation for the water-inrush risk of the top and the floor on 32 coal seam in first mining area. By the means of evaluated results provided basis for mining 32 coal seam to take the related water-preventing measures.The conclusions from this paper will make water-inrush risk evaluation of the top and the floor when fully-mechanized mining and caving coal, seek for the approaches to prevent the water disaster, then provide theoretical basis and technology support to achieve the safety of both mining areas and even mining wells, the high efficiency and the high production.Figure 34 Table24 Reference 60...