鲁西煤矿下组煤开采底板破坏规律及奥灰突水危险性预测-地质工程专业论文.docxVIP

摘要在以往的资源勘查和矿井生产期间，对下组煤未进行过系统的水文地质勘查和水害 防治研究，而奥灰含水层厚度大，岩溶裂隙较发育，水头压力大，在开采下组煤时，奥 灰有可能发生底板突水事故。因此本文对鲁西煤矿下组煤的水害防治研究具有很重要的 理论意义和参考价值。本文以以往的水文地质资料和抽水试验成果为基础，分析了下组煤开采的充水因素，充水通道及可能的充水方式；以地下水动力学理论获取了含水层水文地质参数，得出了 流量降深关系曲线方程，并以此来确定了奥灰含水层的富水性。在理论分析基础上利用 有限差分软件FLAC~3D对煤层采动底板运动破坏规律进行了模拟分析，结合结构力学中 的单向板与双向板理论，并引入Marcus板带法，得出了采动煤层荷载的传递规律；通过 研究下组煤底板奥灰含水层的隔水层岩性、厚度及组合方式，对下组煤底板隔水性能做 出了评价，在此基础上，利用传统的突水系数法和以突变理论建立的尖点模型对下组煤 底板的突水危险性进行了预测，得出了下组煤底板突水危险性的分区图，并取得了比较 一致的结论。针对16#煤及17#煤底板的突水危险性，利用传统的地下水动力学的理论计 算和地下水数值模拟两种方法对奥灰含水层的疏水量进行了预测，为矿井抽、排水系统 的布置提供了依据。关键词：水文地质参数，富水性，FLAC~3D，荷载传递规律，突水危险性，疏水量AbstractIntheperiodofresourcesexplorationandminingproduction,theresearchonwaterdisasterpreventionandthesystematichydrogeologicalexplorationhadn’tbeenconducted.BecausethethicknessofOrdovicianlimestoneaquiferisverylargeandtherearemanykarstfissuresintheaquifer,theaquiferhasahighhydraulicpressure.Thewaterthathasahigh pressureispossibletoinrushtheworkingfacewhenmining.Therefore,theresearchonwaterdisaster prevention andcontrol inLuxi coalmine hasa veryimportant theoreticalsignificanceandreferencevalue.Basedontheprevioushydrogeologicaldataandpumpingtest,theartcleanalyzesthewater-fillingfactors,channelsandmodesoflowercoalgroup.Thehydrogeologicalparametersofaquiferwasobtainedbythemethodofgroundwaterdynamicstheory,andthecurveof relationshipbetweenthedischargeandthedrawdownwasestablished.Then,thewateryieldpropertyofOrdovicianlimestoneaquiferwasevaluated.Onthebasisoftheoreticalanalysis,themovementanddamagelawofcoalseamfloorwassimulatedbyusingthethefinitedifferencesoftwareFLAC~3D.Andtheloadtransferlawofminingcoalseamwasobtainedbythetheoryoftwo-wayslabandMarcusstripmethodbelongtostructuralmechanics.Throughthestudyofthemechanicalpropertiesofrock,thicknessandcombinationoftheaquifugeoverOrdovicianlimestoneaquifer,thepropertiesofobstructwaterofthecoalseamfloorwasevaluated.Takeadvantageofprecedingstudy,thepossibilityofwater-inrushwas predictedbythemethodoftraditionalwaterinrushcoefficientandcuspmodelestablishedon catastroph