Page 194 - 《水资源与水工程学报》2023年第5期
P. 194

! 34 " ! 5 #                      & ' ( ) & * + , -                               Vol.34No.5
               2023 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2023

            DOI:10.11705/j.issn.1672-643X.2023.05.22


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                Modeltestofinfluenceoflocalfailureoninternalbracedrowpilesupport

                                                                           1
                                                            1
                                             1,2
                                CAOWeiping ,XIMaoyang,ZHAOCheng,ZHAOMin                 3
                       (1.SchoolofCivilEngineering,Xi’anUniversityofArchitecture&Technology,Xi’an710055,China;
                       2.ShaanxiKeyLaboratoryofGeotechnicalandUndergroundSpaceEngineering,Xi’an710055,China;
                       3.CollegeofCivil&ArchitectureEngineering,Xi’anTechnologicalUniversity,Xi’an710021,China)
                 Abstract:Toreducetheincidenceofengineeringaccidentscausedbyfoundationpitfailures,theinflu
                 encingmechanismoflocalfailuressuchassupportfailureandsoilleakageinthefoundationpitwithinter
                 nalbracedrowpilesupportwasinvestigatedbymodeltest.Theresultsshowthattheaxialforceofthe
                 supportincreaseswiththedeepeningofthefoundationpitexcavation.Theincrementoftheaxialforceof
                 thesupportnearthemiddleofthefoundationpitisthelargest ,whereasthatnearthepitcorneristhe
                 smallest.Inthecaseoflocalfailureofthesupport,partoftheloadistransferredtotheadjacentsupport
                 throughthepurlin ,andtheotherpartoftheloadistransferredtothedisplacementcoordinationofthe
                 supportstructure.Whenallthesupportfail ,theoverallstiffnessofthesupportstructuredecreases,and
                 thesupportsystembecomescantileverrowpilesupport.Thedisplacement ,bendingmomentofthesup
                 portpileandthesettlementofthesoiloutsidethepitincreasesignificantlycomparedwiththatbeforethe
                 overallfailureofthesupportsystem.Whenthelocalsoilbehindthepileleaks ,thesoilquicklycollapses
                 andflowsintothebottomofthepittoformasoilpile ,creatingalargeareaofcollapseoutsidethepit,
                 whichhasagreatimpactonthesurroundingenvironmentandconstruction.
                 Keywords:foundationpitexcavation;internalbracedrowpile;supportfailure;localfailure;soilleak
                 age ;modeltest
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