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时间:2020-03-26
《龙凤水电站闸基渗流稳定分析.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、第35卷第9期人民黄河Vo135.NO.92013年9月YELLOWRIVERSep.,2013【水利水电工程】龙凤水电站闸基渗流稳定分析廖呜宇,张立勇,罗荣,吴刚,陈贤,李吕英(1.四川大学水利水电学院,四川成都610065;2.中国市政工程西南设计研究总院,四川成都610081)摘要:针对地基渗透性强可能导致闸基渗透破坏的问题,龙风水电站在泄洪闸段上游设置了垂直防渗墙,并深入基岩形成封闭的防渗体系。利用Ansys软件建立了三维渗流模型,分析了有垂直防渗墙和没有防渗墙情况下的闸基渗流特性,结果表
2、明:无防渗墙情况下,闸基以下渗透坡降均匀分布,上游铺盖和下游逸出点达到最大且均远大于沙卵砾石的渗透坡降允许值,极易发生渗透破坏,且水头在底板处只折减约87.0%,导致出逸点渗透坡降值较大;有防渗墙情况下,泄洪闸下游出逸点的坡降值较小,所有水头折减发生在防渗墙部位,;中沙闸段下游出逸点的渗透坡降较小,且所有的水头折减发生在底板处,可以控制整个闸段的渗透破坏,说明实施防渗墙是必要的。关键词:闸基;防渗墙;渗透破坏;泄洪闸;冲沙闸;龙风水电站中图分类号:FV698.2;TV32文献标志码:Adoi:l0
3、.3969/j.issn.1000—1379.2013.09.038Research011theSeepageStabilityofSluiceFoundationofLongfengHydropowerStationLIA0Ming—yu’ZHANGl,i—yong,I,UORong,WUGang,CttENXian,LIIJyu.ying,(1.SchoolofHydraulicandHydroelectrieEngineering,SichuanUniversity,Chengdu6l006
4、5,China;2.SouthwestMunicipalEngineeringDesign&ResearchInstituteofChina,Chengdu610081,China)Abstract:Asthehighpermeabilityfoundationmayleadtotheseepagefailureofsluicefoundatiun,LnngfengHydmpot~erStationbuihverticalCUt—ofwallintheupstreamofsluiceandform
5、edclosedseepagecontrolsystemdeeplyintothebedrnck.thepaperbuihthree—dimensionalseepagerood—elhyapplyingthesoftwareofANSYSandanalyzedtheseepagecharacteristicsofshficefi,undationwithandwith~mtcut一‘)fwal1.Fheresultssh0wthat,intheabsenceofcut—ofl‘wall,seep
6、ageslopedistrilmtesevenlyunderthesluicefoundation,audreaehesthemaximumattheblanketupstreaalandescapepointch)wnstreamwhichisfarbiggerthantheallowablevalue(1fsandandmayhappenseepagefailureeasily.Hydraulicheadre(1ucesonly87.O%atthehaseplatewhichleadstoth
7、eseepageslopevalueotescapepointisIfigger.Withcut—ofwal1.seepageslopevalueotPapepointinthedownstreamoffloodgateissmallerandthereduetinnofallhydraulicheadoccursatthepartsuteut—oftwal1.Seepageslopevalueofes—capepointinthedewnstreamofflushingsluiceissmall
8、erandthereductionofallhydraulicheadOccursatthebaseplate,whichcaoCOltrolseepagefailureofthewholesluieesection,showingbuildingcut—ottwallisnecessary.Keywords:sluicefoundation;cut—ofwall;seepagefailure;fh>odgate;tlushingsluiee;Longt~'ngHydrop,)we
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