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1、AbstractLoessareaofnorthernshaanxiprovincehasuniquetopographyandgeomorphology,geologyandclimaticconditions,isthemultipleregionsofhighwaysbeingdestroyedbyflood,greateconomiclossesarebroughtaboutbyhighwaysbeingdestroyedbyfloodeachyear.Thepossibilityofhighwaysbeingdestroyedbyfloodcanbereduced
2、bysettingreasonablesubgradedrainagesystem,foravarietyofreasons,therearemanyunreasonablecalculationsofavailablesubgradedrainagesystem,can’tmeettheneedofdrainageinthisarea.Theresearchondrainagetechnologyofhigh-gradehighwaysinloessareaofnorthernShaanxiprovincehasthevitalsignificance,theration
3、alityofsubgradedrainagesystemcanbeimproved,thefuctionofsubgradedrainagesystemcanbewellplayed,thepossibilityofhighwaysbeingdestroyedbyfloodcanbereduced,theservicelifeofthehighwaycanbeextended.Onthebasisofthesummaryofthedomesticandoverseasstudyonhighwaydrainagetechnology,bymeansofconsultingi
4、nformationandfieldresearch,thecharacteristicsofgeologicalenvironmentandclimateinloessareaofnorthernShaanxiprovinceweresummarizedandanalyzed,theinfluenceonsubgradedrainagesystemofthesecharacteristicswerealsosummarizedandanalyzed.OnthebasisofthesubgradedrainagesystemofS302,S206andG307inYulin
5、,Shaanxiprovince,fieldresearchwerecarriedout,theexsitingproblemandthereasonofditch,chute,catchwaterandculvertweresummarizedandanalyzed.Evaluationmodelofsubgradedrainagesystemwereestablishedbasedonfuzzymathematics,andtherationalityofthemodelwasverifiedbylivingexample.Basedontheabovestudy,th
6、echaracteristicsoflossesareaofnorthernShaanxiprovinceandthetheoryofdrainagedesignwerecombined,theprinciples,procedure,contentandkeypointsofdrainagedesignwhicharesuitforlossesareaofnorthernShaanxiprovinceweresummarizedandanalyzed,technicalguidancefordrainagedesignoflossesareaofnorthernShaan
7、xiprovincecanbeprovidebythese.Amethodofdrainagestandardizeddesignwasputforword,bymeansofcalculation,sizechartthatissuitforslopeVIIdrainageinlossesareaofnorthernShaanxiprovincewasobtained,underthecircumstancesofthelengthofsloperunoffandcatchmentareaareknown,bym