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                 Permeabilitystudyofasphaltconcreteincorewallundershearlargedeformationconditions

                                                                                   1,2,3
                                                        1,2
                                   HEJianxin 1,2,3 ,LIHao ,YANGWu    1,2,3 ,LIULiang
                          (1.CollegeofHydraulicandCivilEngineering,XinjiangAgriculturalUniversity,Urumqi 830052,China;
                      2.XinjiangKeyLaboratoryofHydraulicEngineeringSecurityandWaterDisasterPrevention,Urumqi 830052,China;
                        3.CorpsKeyLaboratoryofSafetyandDisasterPreventionofEmbankmentEngineering,Urumqi 830052,China)


                  Abstract:Inordertostudythepermeabilitycharacteristicsofasphaltconcreteofheartwallunderlargeshearde
                  formationconditions ,basedonasetoftriaxialshearaxialseepagetestsystem developedindependently,triaxial
                  shearseepagetestswithdifferentcombinationsofperipheralandpermeationpressureswerecarriedoutonasphalt
                  concreteofNo.70andNo.110 ,andtheoptimalmodelforinversionofpermeabilitycoefficientofasphaltconcrete
                  wasproposedbasedontheglobaloptimizationalgorithm.Theresultsshowthat:(1)theshearexpansioneffect
                  causestheopeningandexpansionofcracks,whichincreasesthepermeabilitycoefficientsignificantly.Theaxial
                  strainoftwodifferentgradesofasphaltconcretereaches8% to30% underdifferentcircumferentialpressures ,and
                  theincreaseofpermeabilitycoefficientreache2to3ordersofmagnitude.(2)Thestrainstateandstrainincrement
                  affectthepermeabilityofasphaltconcrete,andthepermeabilitycoefficientchangeswiththestrainfield.Inthe
                  compactionstage ,withtheincreaseofaxialstrain,thevolumeincrementratioisnegativeandthepermeabilityco
                  efficientdecreases ;inthecrackdevelopmentstage,thevolumeincrementratioispositiveandthepermeabilityco
                  efficientincreases.(3)Perimeterpressurehasasignificanteffectonthepermeabilityofasphaltconcrete.The
                  axialstraincorrespondingtothetwogradesofasphaltconcretespecimensreachingtheimpermeabilitysafetythresh
                  oldissmallatlowperimeterpressure,andshowsanincreasingtrendwiththeincreaseofperimeterpressure.When
                  theperimeterpressurewasloadedto1.0MPaandtheaxialstrainincreasedto30%,theimpermeabilitycoefficient
                  ofasphaltconcretestilldidnotexceedtheimpermeabilitysafetythreshold.
                  Keywords:hydraulicasphaltconcrete;largesheardeformation;permeabilitycharacteristics;axialstrain;in
                  versionmodel


                                                                                    (责任编辑:韩 昆)




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