土木工程 建筑 道桥 外文翻译 外文文献 英文文献 沥青路面结构设计的低成本农村道路Word文档格式.docx
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土木工程 建筑 道桥 外文翻译 外文文献 英文文献 沥青路面结构设计的低成本农村道路Word文档格式.docx
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ChenRongshen(陈荣生)
1.CollegeofTransportation,SoutheastUniversity,Nanjing210b9b,China2.CollegeofCivilEngineering,NanjingUniversityofTechnology,Nanjing210009,China
Indevelopingcountries,ruralroadconstructionismostlycumberedby
shortageoffunds.Engineersconcernsmostinruralareasishowtobuildroadswhichnotonlycostlessbutalsomeetthetrafficdemands.EspeciallyinvastruralareasofChina,thereareagreatvarietyoftransportationpatterns,andthetrafficcompositionisverycomplex.Comparedwithothercountries,
thetrafficcompositioninChinaruralareashaveitsownfeatures.Therefore,thereisnoexperienceabouttheruralroadsconstructionforreference.Inrecentyears,thecentralgovernmentofChinahasincreasedthestrengthforruralroadconstruction.Atthesametime,alotofresearches
aboutruralroadconstructionhavebeendonebyresearchersinChina,andsomeconclusionsaboutchinaruralroadshavebeenmade.Intheauthors'
opinion,theselectionofthepavementstructurematerialisthekeymeasuretoreducetheconstructioncostofruralroadsaftertheroutehasbeendetermined.Comparedwithconcretepavement,asphaltpavementrelatively
costslessandisthefirstchoiceforruralroadsinChina.Andthen,according
totheresearchachievementsaboutruralroadsconstruction,theauthorshave
donesomepreliminaryresearchesonthestructuredesignforlow-costasphaltpavementsforruralroads.
1TrafficCompositionofRuralRoad
Ruralroadsincludecountyroads,townroadsandvillageroads.
Thetrafficonruralroadsisusuallymixed.Onacountyroad,trafficvolumeisbetween300to1500veh/dinaverage,andinacountywitha
developedeconomy,itreaches1000to2000veh/d.Thetrafficvolumebetweencountyandtownis100to300veh/d,andthetrafficvolumebetween
townsisusuallylessthan100to300veh/d.Inamixedtrafficflow,trucks
1
accountfor40%to70%ofthetrafficvolume,whicharemainlylighttruckscarryinglessthan2.5tons(includingagriculturalvehiclessuchaselectro-tricycles,walkingtractorsetc.)andmedium-sizetrucksof2.5to5tons.Mostoftheselightormediumtrucksareoverloaded.Theproportionofheavytruckislessthan9%.Onsomeroadstocounties,theproportionof
overloadedtrucksis5%to32%,whileonsomecountyroadsconnectingto
nationalorprovincialtrunkhighways,theproportionofoverloadedvehicles
usuallyamountsto20%to32%.
Thetrafficvolumeonruralroadsisnotheavy.However,consideringthe
practicalsituationinChina,aswellastheexitenceofoverloadedvehicles,
100kN,orBZZ-100wasadoptedasstandardaxleloadintheresearch.
Thepavementdeflectionortheflexural-tensilestressatthebottomofasphaltsurfaceistakenasthedesignparameter.Theaxleloadwascalculatedin
accordancewiththefollowingformula:
N4.35s,CC(P/P)is12Ni
和-theaxleweightofani-levelaxleinkNandtheactionfrequency;
-theaxleweightofstandardaxlein100kNandtheactionfrequency;
Ifthedistancebetweenaxlesislessthan3m,axleloadsarecalculatedas
adouble-axleormulti-axleloads,and
Iftheflexural-tensilestressatthebottomofsemi-rigidbaseistakenasthedesignparameter,theaxleloadiscalculatedinaccordancewiththefollowingformula:
Ifthedistancebetweenaxlesislessthan3m,
2TrafficVolumeonRuralRoads
Minibusesareadoptedasthestandardvehicleforthedesignofruralroads.
2
Table1showsitsexternaldimensions.
Table1Externaldimensionsofthepassengercarm
LengthWidthHeightFrontoverhangDistancebetweenaxlesRearoverhang
6.01.82.00.83.81.4
ThetypicalvehicletypesonruralroadsarelistedinTable2.Andotherssuchasnon-power-drivenvehicles,animal-drawnvehicles,andbicyclescan
betakenintoaccountinthecalculationoftrafficvolumeonruralroads,in
viewoftheirroadsideinterference.
Inaccordancewiththetrafficcompositionandvolumes,ruralroadsare
dividedintofivegrades.ThetrafficvolumeofeachgradeisshowninTable3.
TrafficvolumespecifiedinTable3wasobtainedbytakingtheminibusasthestandardvehicletype,andconvertingdifferenttypesvehiclesaccordingtothevehicleconversioncoefficientsgiveninTable2.InTable3,
t,,,,,365N1,,1s,N,e,
Nereferstothecumulativeequivalentaxleloadactionfrequency;
Nsreferstotheequivalentaxleloadactionfrequencyinthedesignedtrafficlaneinthebeginningoperationperiodofruralroads;
yreferstotheaverageannualgrowthrateoftrafficvolume;
ηreferstolanecoefficient,and1.0forasinglelaneand0.6一0.7fora
duallane.
3StrengthofRo
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