矿井富水体的瞬变电磁场物理模型实验研究

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1、万方数据第28卷第2期岩石力学与工程学报v01．28No．22009年2，JChineseJournalofRockMechanicsandEngineeringFeb．。2009矿井富水体的瞬变电磁场物理模型实验研究刘志新，刘树才，刘仰光(中国矿业大学资源与地球科学学院，江苏徐州221116)擅要，通过物理模型实验，研究矿井富水异常体的瞬变电磁场响应特征，为改进资料解释方法、提高探测精度提供重要依据。根据物理模型实验相似性准则，设计物理模型参数并校lE模型系数；制作矿井富水体物理模型及发射接收装置，并对天线参数及

2、探测能力进行对比分析。实验结果表明：在发射天线参数相同的条件下，接收天线绕制匝数越多，接收到的感应信号就越强；发射线圈中的电流越大，接收到的信号越强：相同条件下，方形天线装置比圆形天线装置接收到的感应信号强。巷道空间及窄问内的金属体对富水体感应场的干扰特征实验表明：当天线位于巷道靠近富水体所在一侧时，接收到的响应值最高；当天线位于远离富水体一侧时，由于巷道空间的影响使探测结果的分辨能力降低。巷道内的金属体(工字钢、金属锚网和铁轨)使所接收到的信号值变大，而富水异常体的响应规律则没有变化。关键词t采矿工程：矿井防治水

3、；瞬变电磁场；物理模型实验；伞窄间特征中圈分类号lTD163文献标识码：A文章编号：1000—6915(2009)02—0259—08RESEARCHoNTRANSIENTELECTRoMAGNETICFlELDoFMINEⅥ，ATER—BEARINGSTRUCTUREBYPHYSICALMoDELEXPERIMENTLIUZhixin，LIUShucai，LIUYangguang(SchoolofResourcesandEarthSciences，ChinaUniversityofMiningandTechnol

4、ogy，Abstract：Byusingthephy’sicalmodelexperiment，thetransientelectromagneticresponsecharacterofminewater-bearingstructureisstudied，whichprovidesanimportantbasisfortheimprovinginterpretivemethodandadvancingaccuracyofdetectingminewater-bearingstructure．Accordingt

5、othesimilaritycriterionofthephysicalmodel，thespecificparametersofphysicalmodelandthecorrespondingcorrectionfactorsarecalculated．Inaddition，theminewater-bearingstructuremodelandthetransmittingandreceivingdevicesareconstructed；andtheantennaparametersanddetection

6、abilitiesarecomparativelyanalyzed．Theresultsindicatethatforthesametransmittingantennaparameters，themorethetU／TISofreceivingantennaale，thestrongerthereceivedsignalis：thelargerthecurrentintransmittingcoilis，thestrongerthereceivedsignalis．Underthesameconditions，t

7、heinductivesignalfromthesquareantennadeviceisstrongerthanthatofcircularantenna．Thephysicalmodelexperimentsareperformedforinterferencecharacteristicsofinductionfieldfromlanewayspaceandmetalbodvwithinlanewayspace．TheresultsindicatewhenantennaIiesnearthesideofthe

8、water．bearingstructure。thereceivedresponsevalueiSthemaximum．珊lentheantennaliesawayfromthesideofthewater．bearingstructure。thedetectingabilityislowerbecauseoftheinfluenceoflanewayspa