采动煤层顶板碎屑岩类含水层富水性评价方法及应用

Evaluation method and application of water-rich of clastic rock aquifer in mining seam roof

砂(砾)岩等碎屑岩类含水层广泛发育于含煤地层中,构成了开采煤层的直接充水含水层,其富水性强弱对矿井充水强度有直接影响,因此对碎屑岩类含水层富水性的评价是矿井水害防治的基础工作。本文以高庄煤矿为例,选取岩层结构和地质构造2个指标作为碎屑岩类含水层富水性的控制因素,提出岩性结构系数,量化含煤地层岩性及其组合关系,引入分形理论定量评价地质构造复杂程度,以此为基础,构建含水层富水性的评价模型。依据矿井已有工作面的突水资料,确定含水层富水性分区阈值及其等级划分标准,初步形成了碎屑岩类含水层富水性的预测方法。本文的研究成果应用于高庄煤矿湖下3上煤层顶板砂岩含水层富水性评价工作中,并取得了良好的效果。

Clastic aquifers such as sandy(conglomerate)rocks are widely developed in coal-bearing strata.It constitutes a direct aquifers for mining coal seams,and its water-filled strength has a direct impact on the water-rich strength of the mine.Therefore,the water-rich evaluation of clastic aquifer has become the basic work of mine water disaster prevention and control.Taking Gaozhuang coal mine as an example,two indexes of rock structure and geological structure are selected as the controlling factors of water-rich of clastic rock aquifers.The lithological structure coefficient is proposed to quantify the lithology and its combination relationship of coal-bearing strata,and fractal theory is introduced to quantitatively evaluate the complexity of geological structures.On this basis,an aquifer water-rich evaluation model is established.According to the data of water inrush from the existing working face in the mine,the threshold of aquifer water-rich zoning and its grading criteria are determined,and a prediction method for water-rich of clastic rock aquifers has been formed.The research results have been applied to water-rich prediction of roof sandstone aquifer in 3上coal seam under Huxia in Gaozhuang coal mine,and good effects have been achieved.