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1、MechanicalperfmanceofadoublefacereinfcedretainingwallinanareadisturbedbyminingAbstract:Theapplicationofadoublefacereinfcedretainingwallduringroadconstructioncanreduceengineeringcostsspeedroadpavinghaveagoodinfluenceonenv

2、ironment.AnABAQUSnumericalmodelofadoublefacereinfcedretainingwallwasbuilt.Theinfluenceofsurfacesubsidenceinducedbyminingwasconsidered.Aphysicalmodeltestwasalsoperfmedinthelabatyonareinfcedretainingwall.Theinfluenceofsubs

3、idenceinducedbyminingwasobserved.Thenumericalresultsmatchmeasurementsinthelabatyverywell.Theverticalpressureonthebaseoftheretainingwallthehizontaldisplacementofthewallthehizontalsoilpressureactingonthewallwereanalyzed.Th

4、edifferentialsettlementofthereinfcedbeltaxialfcesinthewallwerealsostudied.Keywds:doublefacereinfcedretainingwallundergroundminingfiniteelementmethodphysicalmodeltest1IntroductionTheroadsurfaceaboveaminingareawillsubsided

5、uetothewkunderground.Directlybackfillingsoilbefeslopingwasadoptedtoreducetheinfluenceofminingonsurfaceroads.Thismethodusuallywasteslisnotreasonableeconomically.Adoublefacedreinfcedretainingwalldoesnotneedconventionalslop

6、ingtherefesavesl.Withminingtheroadcanbeelevatedusingadoublefacedreinfcedretainingwall[11.Manyscholarshavecarriedoutpreliminarystudiesondoublesidedreinfcedretainingwallst2~8].Leistudiedadoublesidedreinfcedretainingwallina

7、roadprojectbyusingacentrifugalmodeltest[9!.Displacementsinahighdoublesidedretainingwalltheinfluenceofdifferentshapesoftheretainingwallondisplacementsthehizontalearthpressuresactingontheretainingwallwerestudied.Zhuetal.st

8、udieddisplacementsonthesurfaceoftheretainingwallhizontalpressuresactingontheretainingwallthetensilefcesinthereinfcingsteelusingtestmodels[10lTheretainingwalltheystudiedmettheconditionBQ.6HBisthedistancebetweenthetwowalls

9、Histheheightofretainingwall).Nostudyhasbeencarriedoutfadoublefacedretainingwallundertheinfluenceofundergroundmining.Thefollowingshowsthebehaviofadoublefacedretainingwallundertheinfluenceofundergroundminingbyusingnumerica

10、lmodeling.2ProjectbackgroundThereisadoublefacedreinfcedretainingwallintheminingareaofHuainan.Thereinfcementisflatsteelstripthepanelsareironsheetthebackfilliscoalgangue.Thelengthofthedoublefacedretainingwallis10mtheheight

11、is10m.Thewallisreinfcedfadistanceof0.5m.Thecrosssectionofthereinfcementis0.2mx0.002m(Fig.1).3LabatytestftheprojectNumericalresultswerecomparedtoactualmeasurementsduringdevelopmentoftheprojectmodel.Theratioofthephysicalmo

12、deldimensionstotheactualdimensionsis20.Boththelengthheightofthemodelretainingwallare50cm.Therewerefivedisplacementgaugesontheleftthreeontherightfcompensation.Therewerethreepressurecellsonthebottomoftheretainingwallfmeasu

13、ringthevariationinverticalpressure.Threepressurecellswereontheflanktomeasurethehizontalpressure.Nineboxeswereputunderthesoil.Ajackwaspositionedundereachboxtocontrolsettlement(Fig.2).thereinfcedmaterialissymmetricalinresp

14、ecttothecenterofthereinfcedarea.Thesubsidenceinducedaxialstressinthelowestlayerofreinfcedmaterialismuchhigherthanthatatthetopofthereinfcedmaterial.Themaximumsubsidenceinducedaxialstressinthelowestlayerofreinfcedmateriali

15、s27.6MPa.Themaximumsubsidenceinducedaxialstressinthetoplayerisonly0.29MPa.5Conclusions1)Theverticalstressactingonthebaseoftheretainingwallincreasesinthedlewhilesimultaneouslydecreasingatthetwoends.Themaximumsubsidenceind

16、ucedverticalstressonthebaseoftheretainingwallis98.1kPawhichisdoubletheweightofthesoilitself.2)Anoutwarddisplacementof0.06cmoccursatthetopoftheblockoftheretainingwall.Aninwarddisplacementof3.64cmoccursatthelowestpartofthe

17、blockoftheretainingwall.Thisimpliesthatthesoilpressurenearthetopoftheblockisinanactivestatethatthesoilpressuredecreasesby0.56kPa.Thesoilpressurenearthebottomoftheblockisinapassivestateitincreasesby76.5kPa.3)Duetosubsiden

18、cethereinfcedareabecomescurvedsymmetricallyrelativetothecenteroftheretainingwall.Thedifferentialsubsidenceatthebottomofthereinfcedareaoftheretainingwallismuchgreaterthatthatatthetop.Themaximumdifferentialsubsidenceis9.8c

19、m.Subsidenceinducedstresschangeatthebottomofthereinfcedareaoftheretainingwallismuchgreaterthanthatatthetopofthereinfcedarea.Themaximumsubsidenceinducedstressis27.6MPawhichisonefourthofthetensilestrengthofsteel.6Suggestio

20、nsWhendifferentialsubsidenceoccursinthefuturethefollowingmeasurementsshouldbetakenintheretainingwall.1)Ahighpressuresplittingfmedpileothermethodsshouldbeusedtoimprovethegroundsoilfthesoftsoil.2)Flexibleblockshouldbeusedi

21、fpossiblethedensityofreinfcingmaterialincreasedtodecreasethehizontaldisplacementstressesintheblockoftheretainingwall.3)Thebottomofthereinfcedareaoftheretainingwallshouldbelargertogetabiggersafetyfact.Atthesametimethejoin

22、tareabetweenthereinfcedareatheblockshouldbereinfcedtoavoidtensilestressinducedcracking.Throughtheabovediscussionwehavereinfcedsoilretainingwalltypestructureacteristicswkingprincipleofunderstingmasteringenablingaccuratepl

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