奥陶系灰岩顶部作为煤层底板隔水层的可利用性研究

Utilizability research on the top layer of Ordovician limestone as aquiclude of coal seam floor

为安全开采下组煤,减少煤层带压开采导致突水事故,对奥灰顶部风化充填带地层的形成演化进行探讨,并绘制该层位在华北地区厚度等值线图;对奥陶系顶部灰岩试样与煤系隔水层中粉砂岩和泥岩试样的岩石强度和渗透系数进行室内试验测试对比,并针对华北型煤田典型煤区的奥灰顶部风化充填带进行压水试验。

For the safety mining of lower group coal seam and reducing water inrush disaster induced by mining above confined aquifer, the formation and evolution mechanism of the weathering zone at the top of the Ordovician limestone was discussed, and a thickness contour map of the weathering zone in North China was plotted. The rock strength and permeability coefficients of limestone samples at the top of Ordovician system and the siltstone and mudstone samples in the coal seam aquiclude were tested and contrasted in the laboratory, and pump-in test was conducted in the weathering filling zone at the top of Ordovic＇ian limestone of typical coal field in North China.