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1、220西安理工大學(xué)學(xué)報JournalofXi’anUniversityofTechnology(2015)Vo1.31No.2文章編號:1006—4710(2015)02—022005混凝土面板堆石壩局部止水縫失效滲透穩(wěn)定分析高俊,黨發(fā)寧,王振華(1.西安理工大學(xué)巖土工程研究所,陜西西安710048;2.中國電力工程顧問集團西北電力設(shè)計院,陜西西安710075)摘要:混凝土面板堆石壩的防滲面板很容易失效,面板一旦失效對大壩的滲透速度、滲透流量以及滲透坡降產(chǎn)生重大影響,由于壩體.7--程地質(zhì)條件往往比較復(fù)雜,需要研究恰當(dāng)?shù)挠嬎惴椒ā@糜嬎銤B流的專業(yè)有限元軟件SEEP一3D,結(jié)合工程實例
2、,采用傳統(tǒng)的數(shù)值計算方法,計算單一垂直縫不同位置失效的水頭分布、滲透流量大小以及浸潤線位置,并與解析解進行對比,結(jié)果發(fā)現(xiàn)滲透流量不符合滲透規(guī)律。鑒于此,在傳統(tǒng)的數(shù)值計算方法基礎(chǔ)上,提出一種新的數(shù)值計算方法,即在下游分別施加該失效縫位置處的水頭邊界,其計算結(jié)果與工程實際和解析解吻合很好。研究成果可以為混凝土面板堆石壩的防滲設(shè)計提供參考。關(guān)鍵詞:面板堆石壩;垂直縫失效;滲流穩(wěn)定分析;數(shù)值計算方法中圖分類號:TV223.4文獻標志碼: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