兖州煤田奥灰水文地质特征及对下组煤开采的影响研究-矿产普查与勘探专业论文.docx

摘要本文对兖州煤田奥灰水文地质特征进行分析，并对下组煤开采的影响进行了研究。在系统收集兖州矿区矿井物探、钻探资料和抽水试验资料的基础上，对矿区奥灰含水层的不同层段岩性、厚度、富水性进行了研究，划分了富水性分区，分析了奥灰含水层的水位变化情况及其原因；针对不同的底板情况，详细研究了奥灰含水层的突水机理，提出三种奥灰突水类型，即底板破坏型，断层型和裂隙型突水。对矿区内奥灰含水层与下组煤之间隔水层的岩性、厚度及变化进行了分析，并对隔水层的隔水性能做出了综合评价；利用突水系数法分析了矿区下组煤开采时受奥灰水的影响程度，预测了下组煤各煤层开采的底板突水危险区；综合考虑矿区内奥灰含水层的水文地质特征，探讨了奥灰水防治的技术途径，提出了以疏水降压为主的防治方法，实现矿井安全生产。关键词：水文地质特征，奥灰突水机理，突水系数法，底板突水危险区ABSTRACTThispaperanalysesthehydrogeologicalcharacteristicsofOrdovicianlimestone,andstudiestheinfluenceofOrdovicianlimestoneontheexploitationoflower-groupcoalseamintheYanzhouminearea.Basedonthegeophysicalexplorationdata,drillingdataandpumpingtestdata,theauthoranalysesthelithologicfeatures,thethicknessandtheirvariation,andthewaterabundanceofOrdovicianlimestone,carriesonthehydrogeologicalsubdivision,andprobesintothechangeandreasonofwaterlevelofOrdovicianlimestone.BasesonthevariousfloortheauthorhasstudieddetaillythewaterinrushmechanismofOrdovicianlimestone.Thatisfloorfailurewaterinrush,faultwaterinrush,andcannywaterinrush.Basedonthelithology,thicknessofaquifugeandchangesoftherockbetweenOrdovicianlimestoneaquiferoustolower-groupcoalseam,thewatertightnessofaquifugeareevaluated.TheinfluencingdegreesthatOrdovicianlimestoneontheexploitationoflower-groupcoalseamisanalysedusingthewayofwaterburstingcoefficient,andpredictedthedangerzonesofwaterinrushfromfloor.SyntheticallyconsideringthehydrogeologicalcharacteristicsofOrdovicianlimestone,thepapertalkedaboutthepreventingandtreatingwaterdisasterofOrdovicianlimestone.Theauthorputforwarddownwaterlevelbydrainingwatertoproductsafely.Keywords:hydrogeologicalfeature,waterinrushmechanismofOrdovicianlimestone,waterburstingcoefficient,dangerzoneofwaterinrushfromfloor目录1. 绪论···················································································································11.1 论文选题及研究意义···································································································11.2国内外研究现状····································································