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时间:2020-03-26
《高密度电阻率勘测方法分辨率研究与探讨.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofEngineeringGeology工程地质学报1004-9665/2014/22(5)101507DOI:10.13544/j.cnki.jeg.2014.05.035高密度电阻率勘测方法分辨率研究与探讨黄真萍胡艳朱鹏超李文灵(福州大学环境与资源学院福州350108)摘要随着高密度电阻率法在工程中的应用日益广泛,对分辨率的影响因素分析研究也受到重视。论文以均匀半空间局部直立异常体为探测目标,建立多个基于温纳高密度电法装置的地电模型,采用有限元等方法进行正反演数值模拟分析,对高密度电阻率法探测分辨率的影响规律进行探讨。分析表明,
2、地形起伏会引起异常体的位置与形态发生畸变和位移,分辨率降低;电阻率差异增大,分辨率提高;深径比增大,分辨率降低;当异常体的水平范围一定时,探测分辨率随纵深的增大而提高。关键词高密度电法异常体分辨率正演模拟中图分类号:P6313文献标识码:AANALYSISOFRESOLUTIONINFLUENCEFACTORSOFHIGHDENSITYELECTRICALMETHODANDITSAPPLICATIONHUANGZhenpingHUYanZHUPengchaoLIWenling(SchoolofEnvironmentandResource,Fuzho
3、uUniversity,Fuzhou350108)AbstractInrecentyears,highdensityelectricalmethodhavebeenusedmoreandmorewidelyandtheresearchesonresolutioninfluencefactorsanalysisofthehighdensityelectricalmethodhavebeendrawnmuchattentions.Thispapertakesthepartiallyerectanomalyofauniformhalfspaceasde
4、tecttarget,buildingdifferentmodelstosimulateandanalyzewiththeWennerhighdensityelectricaldevice,employing2DRESsoftwaretoprocessforwardandinversenumericalsimulationandanalysistoobtaintheeffectsoftheterrain,resistivitydifferences,depthtodiameterratioanddeepeningonthehighdensityel
5、ectricalproberesolution.Theresultsshowthattheundulatingterrainmakestheapparentresistivityanomalylocationdisplaced,shapedistortedandtheresolutionreduced;thedetectingresolutionofhighdensityresistivitymethodincreaseswiththeincreaseofresistivitydifference;thedetectingresolutiondecr
6、easeswiththeincreaseofdepthtodiameterratio,andthedetectingresolutionincreaseswiththeincreaseofextendeddepthwhenthelateralwidthofcertainanomaliesreachingacriticallevel.Finally,therecommendationstoimprovethedetectingresolutionaregivenbycombiningthetheoreticalanalysisandtheengineer
7、ingapplication.KeywordsHighdensityelectricalmethod,Abnormitybody,Resolution,Forwardmodeling收稿日期:2014-04-05;收到修改稿日期:2014-09-05.基金项目:国家自然科学基金(编号:41272300)资助.第一作者简介:黄真萍(1965-),女,副教授,硕士生导师,从事地质工程波动勘测技术研究.Email:zhphuang@126.com1016JournalofEngineeringGeology工程地质学报20140引言高密度电阻率法以岩土体
8、导电性差异为基础,其应用范围广泛,涉及水利水电、环境工程地质、铁路、工程质量检测等领域,取得了
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