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时间:2019-02-04
《混凝土面板堆石坝局部止水缝失效渗透稳定分析》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、220西安理工大学学报JournalofXi’anUniversityofTechnology(2015)Vo1.31No.2文章编号:1006—4710(2015)02—022005混凝土面板堆石坝局部止水缝失效渗透稳定分析高俊,党发宁,王振华(1.西安理工大学岩土工程研究所,陕西西安710048;2.中国电力工程顾问集团西北电力设计院,陕西西安710075)摘要:混凝土面板堆石坝的防渗面板很容易失效,面板一旦失效对大坝的渗透速度、渗透流量以及渗透坡降产生重大影响,由于坝体.7--程地质条件往往比较复杂,需要研究恰当的计算方法。利用计算渗流的专业有限元软件SEEP一3D,结合工程实例
2、,采用传统的数值计算方法,计算单一垂直缝不同位置失效的水头分布、渗透流量大小以及浸润线位置,并与解析解进行对比,结果发现渗透流量不符合渗透规律。鉴于此,在传统的数值计算方法基础上,提出一种新的数值计算方法,即在下游分别施加该失效缝位置处的水头边界,其计算结果与工程实际和解析解吻合很好。研究成果可以为混凝土面板堆石坝的防渗设计提供参考。关键词:面板堆石坝;垂直缝失效;渗流稳定分析;数值计算方法中图分类号:TV223.4文献标志码:ASeepagestabilityanalysisofconcretefacedrock—filldamunderthecasesoflocalsealseam
3、failureGAOJun。DANGFaning,WANGZhenhua’。(1.InstituteofGeotechnicalEngineeringXi'anUniversityofTechnology,Xi’an710048,China;2.NorthwestElectricPowerDesignInstituteofChinaPowerEngineeringConsultingGroup,Xi’an710075,China)Abstract:Theimperviousfaceofconcretefacedrock—filldamiseasytogetfailed.Oncethei
4、m—perviouSfacefails.itcanproduceanimportanteffectupontheinfiltrationrate,flowandslopegradient,accordingly,itisnecessarytostudyanappropriatecalculationmethod,forthedambodyengineeringgeologicalconditionsarerathercomplicated.TheprofessionalfiniteelementsoftwareSEEP—3Dforcomputingseepageflow——incomb
5、inationwithengineeringrealexamplesisusedwiththetraditiona1numerica1calculationmethodtocalculatethewaterheaddistributionseepageflowdimensionsandphreaticlinepositionofthesingleverticalseamfailureindifferentpositionsandtomakethecontrastwiththeanalyticalsolutionSOthattheresultshavefoundthattheseepag
6、eflowisnotincoincidencewiththeseepagelaws.Forthisreason,basedonthetradi—tionalnumericalcalculationmethod,thispapersuggestsakindofnumericalcalculationmethod(i.ewaterheadboundaryshouldbeappliedtothefailedseampositionsdownstreamrespectively)whosecalculationresultsarefoundtobeinverygoodcoincidencewi
7、ththerealengineeringexam—plesandanalyticalsolution.Accordingly,theresearchresultscanprovidethereferencesfortheseepage—proofdesignofconcretefacedrock—filldam.Keywords:rockfilldam;verticalseamfailure;seepagestabilityanalysis;n
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