Page 198 - 《水资源与水工程学报》2023年第2期
P. 198

!34 " ! 2 #                       & ' ( ) & * + , -                               Vol.34No.2
               2023 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2023

            DOI:10.11705/j.issn.1672-643X.2023.02.25


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                 GHIJK:TV16   LMNOP:A    LQRK:1672643X(2023)02019408
                           Sensitivityanalysisofmesoparametersofloessinaxial
                                         fracturingtestbasedonPFC2D

                                                  1,2
                                                                              1,2
                                  1
                                                                 1,2
                          JIALeqi,YANSonghong ,SUNWeiyu ,OUErfeng ,ZHANGJian                  1
                      (1.SchoolofCivilEngineering,LanzhouJiaotongUniversity,Lanzhou730070,China;2.KeyLaboratoryof
                            Road&BridgeandUndergroundEngineeringofGansuProvince,Lanzhou730070,China)
                 Abstract:Thelowtensilestrengthofloessisoneoftheimportantcausesofthefrequentoccurrenceof
                 hazardsintheengineeringconstructioninloessarea.Regardingtothisproblem,thenumericalsimulation
                 ofloessaxialfracturingtestiscarriedoutusingthediscreteelementprogramPFC2D ,withwhichthein
                 fluenceofsinglemesoparametersonthetensilepropertiesofloessisstudiedbyvariablecontrolmethod,
                 andthesensitivityofeachmesoparameterisanalyzedbyorthogonaltest.Theresultsshowthatthetensile
                 strengthofloessdecreaseslogarithmicallywiththe 珋 珋
                                                           k/kratioofbondingstiffness,andincreaseslinearly
                                                            n  s
                 withthebondingstrength 珚 andradiusmultiplier 珔 .Moreover,Thetensilestiffnessofloessdecreases
                                                           λ
                                      σ c
                 logarithmicallywiththe 珋 珋                              λ
                                     k/kratio,andincreaseslinearlywiththe 珔 .Furthermore,theradiusmultiplier
                                        s
                                      n
                 hasthestrongestinfluenceonthetensilestrength,thebondingstiffnessratiohasthestrongestinfluence
                                                           
                 onthetensilestiffness ,andtheparticlesizeratior hastheweakestinfluenceonthetensilestrengthand
                 thetensilestiffness.Thestudycanprovidesomereferencefortheselectionofmesoparametersinthenu
                 mericalsimulationofloessaxialfracturingtests.
                 Keywords:axialfracturingofloess;numericalsimulation;tensilestrength;mesoparameter;sensitivity
                 analysis ;particalflowcodeintwodemensions(PFC2D)
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