基于奥灰突水系数演变的水库下带压开采研究

Study on Mining with Pressure under Reservoir Based on Ordovician Limestone Water Inrush Coefficient Evolution

小浪底库区蓄水对煤层底板的奥灰承压水形成补给,进而引起新安井田底板突水系数发生变化,矿井水文地质条件日趋复杂。本文介绍了煤层底板岩层条件,阐述了奥陶系灰岩的富水特征,统计绘制了库区水位与水文孔测压值的相关曲线,分析了曲线峰谷值反映的井田水文地质迹象及与安全生产的内在联系,提出了扩大监测、重点巡查、物探查异、打钻注浆、动态评价及应急设防等带压开采的有效对策,以确保矿井安全生产和中长期稳定接续。

The coalmine hydrogeology conditions becomes complicated because the ordovician limestone confined aquifer below the coalseam floor gets recharged by Xiaolangdi reservoir area after its sluice , which leads to water burst coefficient of coalseam floor changing. The article introduces the stratum conditions of the coal seam floor, elaborates the water rich feature of the Ordovician limestone, counts and draws the relative curve between the reservoir water level and the pressure of the hydrological hole, analyses inner relations between the hydrogeology factors reflected by the peak and valley of the curve and the safety production, proposes effective countermeasures such as expanding monitor, key point inspect, exploration detecting, drilling grouting, dynamic evaluating and emergency prevention which ai- ming at mining with pressure, ensures the safety and middle -long term steady succeed for the coal mine.