路基.docx

路基.docx

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路基

Subgradequalityanddiseasecontrolmeasuresand

AsphaltPavementSubgradeofCauseandTreatmentMeasures

Abstract:

embankmentisthebasisoftheroad,roadbedsubgradequalitydefectsare"spring",slopeinstability,settlement,andseasonalfrozensoilsubgradeandotheremergingdiseases.Whenembankmentsoftunstable,underrepeatedtrafficloads,notonlywillcauseunevenroadsurfacesubsidence,promptingprematuredestructionoftheroad,andwhentheembankmentcollapseorlandslideoccurs,itwillcausetrafficinterruption,tothegreatroadsafetyproblems,inflictingsignificantpropertydamage.

Keywords:

embankment"spring"diseasecontrolsubgradesettlement

flatnesstreatmentmeasures

First,thefoundation"spring"andPrevention:

Foundationof"spring"wherethecracksurfacewasradioactive（clay）orloose（sandysoil）,fromthetwentytothirtymetersoutside,onecanfindthespringpointsurfaceroughnessdifferentfromnormalcompaction.Acceptanceofcompactionovertheearth,thefirstvisualappearance,andthentheelevationandthedegreeofcompactiontestsamplesforanalysis,thisdiseaseismorecommoninthemountainousroads.Thiscontrol"spring"fromtherawmaterialstostartfoundation,thefollowingisthetreatment"spring"foundationpoints:

（1）subgradenaturalconsistencytoavoidtheuseoflessthan1.1,greaterthan40liquidlimit,plasticityindexgreaterthan18,thewatercontentof2percentagepointsgreaterthantheoptimummoisturecontentofsoil.Mustbecarefulnottousetwodifferentkindsofsoilinmixedfillconstruction,especiallypoorpermeabilityofsoilcannotbewrappedwithgoodpermeabilityofthesoil.

（2）rollingprocessintheweaklayerisfoundtohaveoccurred,shouldbepromptlyremovedandre-compactedsoilreplacementbenign.Andthedegreeofcompactionandwatercontentoftheexamination,tobecheckedonlyafterpassingalayeroffilling.

（3）improvementofthelocalsectionofthe"spring"cannotaffecttheroadsubgradeandroadsafetyistoowetfortheted,andblendinguntilthemoisturecontentoftherightshapeafterrolling,turningmixshouldbemixedwithlimeordirectlyexcavatedsoilforfillingtheappropriateRCCshape.

（4）for"spring"foundation,theimportantthingistodothedrainageworkPavement,isusuallybesttotakemeasurestoreducedwatertableundertheembankment50cm.

（5）beforefillingembankmentclearinthemixedweeds,mud,etc.,overwetsoilandthesoilwithorganicmatterwillnotbeallowedtouse,easytofillintheembraceoforganicmatterhasdecomposedorganicmatteraftertheformationofvoidsinthesoil;andmorethanover-wetsoilcompactionoptimummoisturecontent,failingtomeetrequireddensitywillresultina"spring"roadbed.

Second,EmbankmentSubsidenceControl:

（1）constructionmuststrengthentechnicaltraining,theconstructiontechniciansandoperatorstounderstandthesignificanceofhierarchicalcompaction,totheoperatortodotechnicaltests,theloosefillembankmentthicknessdoesnotexceedtherelevantprovisionsshop,toavoidthethickfillcannotbebuiltwithinthethicknessofloosesoilspreadalltherequiredcompacteddensity,resultingmainlythesubgradedeflection,orcausefoundationsettlement.

（2）attentiontotheoriginalgroundhandling,compactionandreinforcementtostrengthenthefoundationfortheoriginalgroundhorizontalorverticalsteepslopeof1:

5shouldbemadeinthestep-likeprocessing,andfullycompacted.

（3）highfillsectiontoconsidertheearlystarttoavoidfillingtoofast,theindividualisbetterroadbedfill,conditionsallowthesectionsofthehigh-fillwaterinjectionmethodcanbeusedsettlementconstruction,roadbaseconstructiondelaysputasmuchaspossible,especiallyPavementconstructionthenthemorepowerfulsectionsofsettlement,primarilybecausethenaturalfillingsubgradesettlementisnotenoughtime,sotrynottoconstructionofroadbedandroadsurfaceconstructionofthesameyear,sothatsubsidenceofthediseasewouldbemuchless.Embankmentonaweakfoundationforthefilling,inadditiontotheweakfoundationforeffectiveaction,fromtheoriginal1~2meterabovegroundheightofnotfillinginfines.

Third,commondiseasepreventionandtreatmentofseasonalfrozensoilsubgrade:

Highaltitudeareas,mostareashavedifferentlevelsofsubgradeduetoseasonalfreezingphenomenon,andtheresultingboilingroadbed,netcrack,propackageandotherdiseases,forwhicheffectivemethodstoTreatment:

（1）theminimumfillingheightofembankmentmustensurethatnotbecauseofsurfacewater,groundwater,capillarywaterandfrosteffectsandreducethestabilityoftheroadbedinaccordancewithdesignspecifications,accordingtothebaseofwetanddrysoiltypesandcapillarywaterleveltoensurethattheminimumembankmentfillingheight,whentheembankmentheightinrestrictedandcannotachievethespecification,theappropriatetreatmentmeasuresshouldbetaken,suchas:

replacementsand,gravelandotherporousmaterials,theprovisionofseparatelayersorconstructionofundergroundinfiltrationtrenchtoavoidplacesimmersedinwaterandgroundwaterarearoadbed,subgradeworkareaofthebasestrengthandstabilityofsoil.Subgradesoilexcavationshallbenotlessthan60centimeterreplacementgravel,stoneexcavationsubgrade,gravelbeddingshallbe30centimeter,horizontalsectionsofpoordrainageditchtoadditionalblindchannel.

（2）mustcomplywithlocalconditions,theoverallplanning,consideringthefoundationprincipleofverticalandhorizontaldrainagedesign,toavoidlong-termwaterimmersiononbothsidesofroadbed,subgradebearingcapacityofthedeclineinsurfacesettlementoccurs.MustbesetintheVillagesectionofdrainageditches,roadditchesshallbeprovidedwithflatlongitudinalslope,toensuresmoothdrainage.

（3）centralizedhighfillsectionsofdrainagemeasures,andwiththewarningpile,anti-wallandconsider,requiringevery20-40meterandthemainpointofgradientchangesetsimpleorpermanentdraintank.ExcavationSectionoftheDepartmentunderthewaterontheslopetodesignintegrateddrainageditches,andtoconsidertheslopeofsoilandslope,settheretainingwalltopreventlandslides,thelowersectionsofroadbedcantakeadditionalgravelandwaterseepageblindditch,andincreasetoenhancethedrainageditchesandothermeasures.Ensurethatthesubgradeslopestability,highfill,deepembankmentfillslopeshouldbebasedontype,slopeheightandotherspecificationstodeterminegeologicalconditions,highembankmentembankmentstabilitymustbechecked.Fillslopeistoohigh,consideraddinginthemiddleoftheslopesetslopeplatform.

（4）activelypromotetheprotectionofplantprotectionandthehardformofacombinationofcomprehensiveprotection,themorestablesoilslopewithgrass,layingsod,plantingtreesandotherplantprotectionmeasures.Weatheredrock,jointdevelopment,softrock,brokenloose（gravel）Stoneandcutslope,soilerosionbywater,thegrowthofplantscannoteasilybeusedfillsloperetainingwall,masonryandotherengineeringprotectionmeasures,alongRiverembankment,anderosionbyiceroadagainsttheuseofretainingwalls,stonepitching,gabionriprapandotherprotectivemeasuresdirectly.

（5）Setacertaindepthinthesubgradebarrierintheroadsub-baseorsubgradeatthetrapsattheupperstratosphere,withgoodwaterstability,coldstability,andhighstrengthofcoarsegrainedsoilsubgradereplacementtop.

ThedegreeofasphaltpavementsubgradeCausesandtreatmentmeasures:

AsphaltPavementmanyfactorsalone,roughness,qualityofpersonnelwiththeconstruction,subgrade,pavementlayerconstructionquality,bridgeculvertandbridgeexpansionjointsatbothendsofthetreatment,roadconstructionmachineryintheselectionandqualityofthematerialontheroad,whichispreciselytheimpactofroadsurfaceroughnessfactors.Nowroadbedconstructionofasphaltconcreteanalysisoftheimpactofflatness,andtoexploretheformationofasphaltconcretepavementdoesnotcauseandtreatmentmeasures.

First,becauseanalysis:

Asphaltconcretepavementfortheflexiblepavement,theoverallstructuralstiffnesssmallerloadsinthevehicleeasytoproducealargedeflectiondeformation,theroadstructureitselflowerflexuralstrength,itisthevehiclethroughthestructurallayersofloadtransfertothefoundation.Asthebasisfortheroad,embankmentconstructionqualityisgoodorbadwillbereflectedtothepavementlayer,wherethegreatestimpactonthepavementroughnessisunevensubsidence.Unevenpavementsubgradesettlementwillinevitablycauselocalorlargeareaofdepression,causedbyunevenroadsurface,analyzethecauses,nothingmorethan:

（1）newandoldroadbedsettlementlapisnotidealgeneratedunevenroadbedandpavementlayercausedbythelongitudinalcracksanddislocation.

（2）mishandlingofaspecialfoundation,especiallyinlow-lyingperennialwaterofthesoftgroundisnotproperlyhandled,theprotectiveembankment,drainagesystemsareimperfect,resultinginlocalsubgradesettlementanddeformation,thusaffectingthesurfaceroughness.

（3）theinappropriatechoiceofembankmentfill,subgradeproblemsfillingprocess,theroadbedarisinginthecourseofunevensettlement.

Bridge,culvertendsofthephenomenoncausedbyjumpingintotheinevitablehighwayconstructiondefects,butalsotheculpritofpavementroughness.

Second,thetreatmentmeasures:

1.theoriginalsurfacetreatmentbeforetheembankment:

Subgradeconstructionquality,isthePavementprojectcanwithstandtime,ve