煤层直接顶板弱富水性含水层涌(突)水危险性评价

Risk Evaluation of Water Inrush in Poor Water Yield Capacity Aquifer of Coal Seam Direct Roof

针对当煤层顶板含水层富水性较弱且煤层与含水层之间缺失隔水层时,煤层顶板涌(突)水危险性评价的难题,借鉴"三图法"基本原理,采用基于多源信息融合的富水性指数法对含水层富水性进行评价,绘制出富水性分区图;以垮裂带发育到含水层中的距离与含水层厚度的比值为指标确定垮裂程度分区图;将富水性分区图与垮裂程度分区图复合叠加,根据制定的涌(突)水危险性评价标准,最终获得煤层顶板涌(突)水危险性评价结果。结果表明:该方法较好地反映了垮裂高度对涌(突)水危险性的影响,与实际情况较为吻合,较传统"三图法"更加有效。

For the difficult problem of water inrush evaluation of coal seam roof, when the water yield property of the coal seam roof aquifer is weak and the water-resisting layer between the coal seam and the aquifer is lost. Based on the principle of three maps method, water yield property of aquifer is evaluated and the partition map for water yield capacity is drawn by the method of water-rich index based on multi-source information fusion. The ratio of the distance from the fractured zone to the aquifer and the aquifer thickness is the index to determine cracking degree of partition map; compositely overlaying water-rich zoning map and the fracturing degree zoning map, according to the evaluation criteria of water bursting risk, the evaluation results of the water bursting risk of coal seam roof were obtained. The results show that the method can reflect the influence of the crack height on the water inrush risk, and is in good agreement with the actual situation. It is more scientific and effective than the traditional three maps method.