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                   Studyonhydraulicfracturingofhighconcretedam consideringsurfacetensionofwater

                                                                1,2
                                                   2
                                     1
                                                                                 2
                         WUYangfeng,WANGYang,JIAJinsheng ,DINGLianying,SHANBingyin
                                   (1.SchoolofCivilEngineering,TianjinUniversity,Tianjin 300350,China;
                      2.ChinaInstituteofWaterResourcesandHydropowerResearch,BeijingIWHR - KHLCo.,Ltd,Beijing 100038,China;
                                  3.CGCOCWaterandElectricEngineeringCo.,Ltd,Zhengzhou 470016,China)
                  Abstract:HydraulicfracturingisapotentialsafetyhazardforhighconcretedamsandhighRCCdamsover200
                  meters.Inordertostudythehydraulicfracturingmechanism ofhighconcretedam ,anewtypeofconcretehigh
                  pressurewatersplittingspecimenwasdeveloped ,andthehydraulicfracturingandpneumaticfracturingtestsunder
                  thesameconditionswerestudiedbyusingtheinventedspecimen.Theresultsshowthatthewaterpressureofhy
                  draulicfracturingishigherthanthatofpneumaticfracturingunderstaticpressure ,andthesurfacetensionofwater
                  intheprocessofconcretefracturehasaresistancetocrackpropagation.Basedonthetest ,theexpressionofwater
                  surfacetensionresistancetosplittingeffectisproposed ,andtheconcretehydraulicsplittingmodelconsideringwa
                  tersurfacetensionisconstructedbyusingthestressintensityfactormethodatthecracktipinconcretefractureme
                  chanics.Themodelcalculationresultsareingoodagreementwiththeexperimentalresults.Thewatersurfaceten
                  sionmodelisusedtoanalyzethehydraulicfracturingeffectof200metersgravitydams ,whichcanfurtherimprove
                  thedesignofsuperhighconcretedamsconsideringhigh - pressurewaterfracturing.
                  Keywords:highconcretedams; hydraulicfracturing; pneumaticfracturing; surfacetension; stressintensity
                  factors


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