东滩煤矿奥陶系顶部相对隔水层厚度划分

摘要

In order to provide theoretical guidance for the safe mining of the lower coal group, demonstration analysis was made on the water-resisting property of the rock stratum on the top of the Ordovician system based on the theory that the water-resisting layers existed on the top of the Ordoviciansystem in North China. Analysis was carried out on the structural characteristics and the karst fissure development of the top strata of the Ordovician system according to the geological drilling data of Ordovician system,the hydro-geologic tests and borehole logging data. Based on water yield from boreholes in the process of water discharging tests in Ordovician water-resisting layers and through repeated comparison and verification of the logging data,the thickness of the water-resisting layer on the top of the Ordovician system was determined. This research result has reference significance for the safe mining of the lower coal group under high water pressure in Dongtan Mine,can be used to accurately evaluate the Ordovician floor water-inrush risk and provide reference for the water hazard prevention during the mining of the lower coal group.%为了给下组煤层的安全开采提供理论指导，在华北地层奥陶系顶部存在隔水层的理论基础上，对东滩煤矿奥陶系顶部岩层的隔水性进行论证分析。利用揭露奥灰的地质钻探资料和地质水文试验以及钻孔测井等手段，分析奥陶系顶部结构特征和岩溶裂隙发育情况，结合奥灰含水层井下放水试验过程中的钻孔出水量，并借助测井资料的反复对比、验证，从而确定奥灰顶部隔水层的厚度。研究结果对于东滩煤矿高水压下的下组煤开采有借鉴意义，能够更加准确地评价奥灰底板突水危险性，为下组煤开采的防治水工作提供参考。