毕业设计道桥毕业设计外文翻译.docx
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毕业设计道桥毕业设计外文翻译.docx
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毕业设计道桥毕业设计外文翻译
【关键字】毕业设计
本科毕业设计
外文翻译
学院(部):
土木建筑学院
专业班级:
学生姓名:
指导教师:
2012年6月6日
structuralDesignofAsphaltPavementforLowCostRuralRoads
Indevelopingcountries,ruralroadconstructionismostlycumberedbyshortageoffunds.Engineersconcernsmostinruralareasishowtobuildroadswhichnotonlycostlessbutalsomeetthetrafficdemands.EspeciallyinvastruralareasofChina,thereareagreatvarietyoftransportationpatterns,andthetrafficcompositionisverycomplex.Comparedwithothercountries,thetrafficcompositioninChinaruralareashaveitsownfeatures.Therefore,thereisnoexperienceabouttheruralroadsconstructionforreference.Inrecentyears,thecentralgovernmentofChinahasincreasedthestrengthforruralroadconstruction.Atthesametime,alotofresearchesaboutruralroadconstructionhavebeendonebyresearchersinChina,andsomeconclusionsaboutchinaruralroadshavebeenmade.Intheauthors'opinion,theselectionofthepavementstructurematerialisthekeymeasuretoreducetheconstructioncostofruralroadsaftertheroutehasbeendetermined.Comparedwithconcretepavement,asphaltpavementrelativelycostslessandisthefirstchoiceforruralroadsinChina.Andthen,accordingtotheresearchachievementsaboutruralroadsconstruction,theauthorshavedonesomepreliminaryresearchesonthestructuredesignforlow-costasphaltpavementsforruralroads.
1TrafficCompositionofRuralRoad
Ruralroadsincludecountyroads,townroadsandvillageroads.
Thetrafficonruralroadsisusuallymixed.Onacountyroad,trafficvolumeisbetween300to1500veh/dinaverage,andinacountywithadevelopedeconomy,itreaches1000to2000veh/d.Thetrafficvolumebetweencountyandtownis100to300veh/d,andthetrafficvolumebetweentownsisusuallylessthan100to300veh/d.Inamixedtrafficflow,trucksaccountfor40%to70%ofthetrafficvolume,whicharemainlylighttruckscarryinglessthan2.5tons(includingagriculturalvehiclessuchaselectro-tricycles,walkingtractorsetc.)andmedium-sizetrucksof2.5to5tons.Mostoftheselightormediumtrucksareoverloaded.Theproportionofheavytruckislessthan9%.Onsomeroadstocounties,theproportionofoverloadedtrucksis5%to32%,whileonsomecountyroadsconnectingtonationalorprovincialtrunkhighways,theproportionofoverloadedvehiclesusuallyamountsto20%to32%.
Thetrafficvolumeonruralroadsisnotheavy.However,consideringthepracticalsituationinChina,aswellastheexitenceofoverloadedvehicles,100kN,orBZZ-100wasadoptedasstandardaxleloadintheresearch.
Thepavementdeflectionortheflexural-tensilestressatthebottomofasphaltsurfaceistakenasthedesignparameter.Theaxleloadwascalculatedin
accordancewiththefollowingformula:
和-theaxleweightofani-levelaxleinkNandtheactionfrequency;
-theaxleweightofstandardaxlein100kNandtheactionfrequency;
Ifthedistancebetweenaxlesislessthan3m,axleloadsarecalculatedas
adouble-axleormulti-axleloads,and
Iftheflexural-tensilestressatthebottomofsemi-rigidbaseistakenasthedesignparameter,theaxleloadiscalculatedinaccordancewiththefollowingformula:
Ifthedistancebetweenaxlesislessthan3m,
2TrafficVolumeonRuralRoads
Minibusesareadoptedasthestandardvehicleforthedesignofruralroads.Table1showsitsexternaldimensions.
Table1Externaldimensionsofthepassengercarm
LengthWidthHeightFrontoverhangDistancebetweenaxlesRearoverhang
6.01.82.00.83.81.4
ThetypicalvehicletypesonruralroadsarelistedinTable2.Andotherssuchasnon-power-drivenvehicles,animal-drawnvehicles,andbicyclescanbetakenintoaccountinthecalculationoftrafficvolumeonruralroads,inviewoftheirroadsideinterference.
Inaccordancewiththetrafficcompositionandvolumes,ruralroadsaredividedintofivegrades.ThetrafficvolumeofeachgradeisshowninTable3.
TrafficvolumespecifiedinTable3wasobtainedbytakingtheminibusasthestandardvehicletype,andconvertingdifferenttypesvehiclesaccordingtothevehicleconversioncoefficientsgiveninTable2.InTable3,
Nereferstothecumulativeequivalentaxleloadactionfrequency;
Nsreferstotheequivalentaxleloadactionfrequencyinthedesignedtrafficlaneinthebeginningoperationperiodofruralroads;
yreferstotheaverageannualgrowthrateoftrafficvolume;
ηreferstolanecoefficient,and1.0forasinglelaneand0.6一0.7foraduallane.
3StrengthofRoadbed
Themodulusofresilienceofroadbedvariesgreatly.Forconvenience,thestrengthofroadbedcanbedividedintofourclassesaccordingtoitsmoisturecontentandmodulusofresilience,asshowninTable4.
TheparametersinTable5aredeterminedbycombiningdesignprincipleswithpracticalexperience
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