| According to systematic analysis of the geological and hydrogeolog features in Yisan mining area Qingdong mine.Combined with geological and hydrogeologic prospecting exploration and find out t the primary mineable coal bed (7,82and10coal seam) withinhe mining area the thickness distribution law of overlying each aquifer and aquifuge, lithologic and structural composition, water content, etc., Analysis of results "three separated" large thickness distribution stable, with good impermeable properties, the thickness of the smaller "Four aqufer" weakauras rich water; Combined with3d seismic data and primary drilling data, find out the fluctuation change of the bedrock elevation, to determine the lowest point of the bedrock, the lithology of bedrock weathering zone, engineering fabric properties and thickness distribution, etc.; Based on the mining area for existing exploration and drilling data, combined with additional exploration physical, water mechanical hydraulic characteristics of rock and soil samples test results, To determine the coal pillar leaving in the sand pillar; the selected typical mining working face to carry out the numerical simulation study, analysis of the upper strata in the shallow coal seam mining process activity rule, scientific decision "two bands" height; By field detection, simulation calculation methods such as comprehensive study shows different hydrological engineering geological conditions of "two zones" height calculated value. For the mechanization of shallow coal seam fully mechanized and reasonable waterproof coal pillar (sand) height size so as to provide basis; The primary mineable coal bed increase limit mining technology feasibility study. So as to put forward reasonable design, safety coal and rock pillars. Through this topic research, proved hydrogeological conditions and the correct evaluation of mining area and coal and safety rock pillars for reasonable design, full development and utilization of coal resources is of great significance. |
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