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.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.docx
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外文文献
structuralDesignofAsphaltPavementforLowCostRuralRoads
1.CollegeofTransportation,SoutheastUniversity,Nanjing210b9b,China
2.CollegeofCivilEngineering,NanjingUniversityofTechnology,Nanjing210009,China
Indevelopingcountries,ruralroadconstructionismostlycumberedbyshortageoffunds. Engineersconcernsmostinruralareasishowtobuildroadswhichnotonlycostlessbutalsomeetthetrafficdemands.EspeciallyinvastruralareasofChina,thereareagreatvarietyoftransportationpatterns,andthetrafficcompositionisverycomplex. Comparedwithothercountries,thetrafficcomposition inChinaruralareas haveitsown features.Therefore,thereisnoexperienceabouttheruralroadsconstructionforreference.Inrecentyears,thecentralgovernmentofChinahasincreasedthestrengthforruralroadconstruction.Atthesametime,alotofresearchesaboutruralroadconstructionhavebeendonebyresearchersinChina,andsomeconclusionsaboutchinaruralroadshavebeenmade.Intheauthors'opinion,the selectionofthepavementstructurematerialisthekeymeasuretoreducetheconstructioncostofruralroadsaftertheroutehasbeendetermined. Comparedwithconcretepavement,asphaltpavementrelativelycostslessandisthefirstchoiceforruralroadsinChina.Andthen,accordingtotheresearchachievementsaboutruralroadsconstruction,theauthorshavedonesomepreliminaryresearchesonthestructuredesignforlow-costasphaltpavementsforruralroads.
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1TrafficCompositionofRuralRoad
Ruralroadsincludecountyroads,townroadsandvillageroads.
Thetrafficonruralroadsisusuallymixed.Onacounty road, trafficvolume is between 300 to1500veh/dinaverage,andinacountywithadevelopedeconomy,itreaches1000to2000veh/d.Thetrafficvolumebetweencountyandtownis100to300veh/d,andthetrafficvolumebetweentownsisusuallylessthan100to300veh/d.Ina mixedtrafficflow,trucksaccountfor40%to70%ofthetrafficvolume,whicharemainlylighttruckscarrying less than 2. 5 tons(including agricultural vehicles such aselectro-tricycles,walkingtractorsetc.)andmedium-sizetrucksof2.5to5tons.Mostoftheselightormediumtrucksareoverloaded. Theproportionofheavytruckislessthan9%.Onsomeroadstocounties,theproportionofoverloadedtrucksis5% to32%,whileonsomecountyroadsconnectingtonationalorprovincialtrunkhighways,theproportionofoverloaded vehiclesusually amounts to 20% to32%.
Thetrafficvolumeonruralroadsisnotheavy.However,consideringthepracticalsituationinChina,aswellastheexitenceofoverloadedvehicles,100kN,orBZZ-100wasadoptedasstandardaxleloadintheresearch.
Thepavementdeflectionortheflexural-tensilestressatthebottomofasphaltsurfaceistakenasthedesignparameter.Theaxleloadwascalculatedin
accordancewiththefollowingformula:
Ns
N
CC(P/P)4.35
12 i s
i
和-theaxleweightofani-levelaxleinkNandtheactionfrequency;
-theaxleweightofstandardaxlein100kNandtheactionfrequency;
Ifthedistancebetweenaxlesislessthan3m,axleloadsarecalculatedasadouble-axleormulti-axleloads,and
Iftheflexural-tensilestressatthebottomofsemi-rigidbaseistakenasthedesignparameter,theaxleloadiscalculatedinaccordancewiththefollowingformula:
Ifthedistancebetweenaxlesislessthan3m,
2TrafficVolumeonRuralRoads
Minibusesareadoptedasthestandardvehicleforthedesignofruralroads.
Table1showsitsexternaldimensions.
Table1 Externaldimensionsofthepassengercar m
Length
overhang
Width
Height Frontoverhang
Distancebetweenaxles
Rear
6.0
1.8
2.0 0.8
3.8 1.4
ThetypicalvehicletypesonruralroadsarelistedinTable2.Andotherssuchasnon-power-drivenvehicles,animal-drawnvehicles,andbicyclescanbetakenintoaccountinthecalculationoftrafficvolumeonruralroads,inviewoftheirroadsideinterference.
Inaccordancewiththetrafficcompositionandvolumes ,ruralroadsaredividedintofivegrades.ThetrafficvolumeofeachgradeisshowninTable3.
TrafficvolumespecifiedinTable3wasobtainedbytakingtheminibusasthestandardvehicletype,andconvertingdifferenttypesvehiclesaccordingtothevehicleconversioncoefficientsgiveninTable2.InTable3,
N
t
365Ns1 1
e
Nereferstothecumulativeequivalentaxleloadactionfrequency;
Nsreferstotheequivalentaxleloadactionfrequencyinthedesignedtrafficlaneinthebeginningoperationperiodofruralroads;
yreferstotheaverageannualgrowthrateoftrafficvolume;
ηreferstolanecoefficient,and1.0forasinglelaneand0.6 一0.7foraduallane.
3StrengthofRoadbed
Themodulusofresilienceofroadbedvariesgreatly.Forconven
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