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                          Studyontheinfluenceofupliftpressureondifferencebetweencalculated
                                        andmeasuredheelstressesforgravitydam

                                                                                                      3
                                                           3
                                                1
                                                                                           3
                                                                          1
                                1,2
                  ZHANGGuoxin ,CHENGHeng,GENGJun,ZHOUQiujing,ZHANGHailong,DINGYu
                               (1.ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China;
                         2.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,Beijing 100038,China;
                          3.RiverBasinComplexAdministrationCenterofChinaThreeGorgesCorporation,Yichang 443134,China)
                  Abstract:Damheelstressisanimportantindicatorforevaluatingthesafetyofgravitydams.Whenthefiniteele
                  mentmethodisusedforanalysis ,gravitydamsdesignedaccordingtotheno - tensilestresscriteriontendtohave
                  largetensilestress.However ,therearenoreportsofobservedtensilestressinpracticalprojects.Thegravitydam
                  ofsomeprojectsevenhasgreatcompressivestress.Besides,themeasuredstressvariationisoftenmuchsmaller
                  thanthecalculatedvalue.Inthispaper,theobservationresultsof24gravitydamsathomeandabroadarecoun
                  ted ,andthevariationcharacteristicsofthedam heelstressbeforeandafterwaterstorageareanalyzed.Takinga
                  typicalgravitydamasanexample ,thedamheelstressiscalculatedbymeansofmaterialmechanicsandfiniteele
                  mentmethod,andthevariationlawoftheoreticaldam heelstressandmeasureddam heelstressiscomparedand
                  analyzed.Thispaperfocusesonthecontributionofupliftpressuretothestressoftwodam heelmeasuringpoints ,
                  andrevealsoneofthereasonsforthediscrepancybetweencalculatedandobserveddam heelstress.Theresults
                  showthatthetheoreticalheelstressistheeffectivestressconsideringupliftpressureatthebedrocksideofdam
                  heel ,whilethemeasureddamheelstressisthetotalstressinsidetheconcreteofthedambodyatacertaindistance
                  from thefoundation.Thereisastressdifferenceclosetotheupliftpressurebetweenthetwodamheelstresses.For
                  gravitydamsdesignedaccordingtothecriterionofnotensilestress ,themeasuredpointinthedamisgenerallythe
                  compressivestress,andtheminimumcompressivestressis0.5 - 1.0timestheupstreamhead.Themeasuredeffec
                  tivestressofthedamheeldependsontheseepagefieldandtheporewaterpressurecoefficient(Bcoefficient).The
                  amplitudeofseepagepressureatthispointissmallerthantheupstream headandthereisalag.Therefore ,the
                  measureddam heelstressamplitudeissignificantlysmallerthanthetheoreticaldam heelstressamplitude.The
                  differencebetweentheeffectofupliftpressureontheoreticalandmeasureddamheelisoneoftheimportantreasons
                  forthesignificantdifferencebetweenmeasuredandcalculateddamheelstress.
                  Keywords:gravitydam;upliftpressure;damheel;seepagefield;stress

                                                                                    (责任编辑:韩 昆)


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