资源描述：
《级公路设计专业外文翻译》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、本科毕业设计（论文）专业外文翻译专业名称：土木工程专业（道路与桥梁）年级班级：道桥08-5班学生姓名：宋鹏指导教师：廖明成河南理工大学土木工程学院二○一二年五月十八日河南理工大学本科毕业设计专业外文翻译GeometricDesignofHighwaysTheroadisonekindoflinearconstructionusedfortravel.Itismadeoftheroadbed,theroadsurface,thebridge,theculvertandthetunnel.Inadditio
2、n,italsohasthecrossingoflines,theprotectiveprojectandthetrafficengineeringandtheroutefacility.Theroadbedisthebaseofroadsurface,roadshoulder,sideslope,sideditchfoundations.Itisstonematerialstructure,whichisdesignedaccordingtoroute'splaneposition.Theroadbe
3、d,asthebaseoftravel,mustguaranteethatithastheenoughintensityandthestabilitythatcanpreventthewaterandothernaturaldisasterfromcorroding.Theroadsurfaceisthesurfaceofroad.Itissingleorcomplexstructurebuiltwithmixture.Theroadsurfacerequirebeingsmooth,havingeno
4、ughintensity,goodstabilityandanti-slipperyfunction.Thequalityofroadsurfacedirectlyaffectsthesafe,comfortandthetraffic.HighwaygeometrydesignstoconsiderHighwayHorizontalAlignment,VerticalAlignmenttwokindsoflinearandcross-sectionalcompositionofcoordination,
5、butalsopayattentiontothesmoothflowofthelineofsight,etc.Determinetheroadgeometry,considerthetopography,surfacefeatures,rationaluseoflandandenvironmentalprotectionfactors,tomakefulluseofthehighwaygeometriccomponentsofreasonablesizeandthelinearcombination.1
6、.AlignmentDesignThealignmentofaroadisshownontheplaneviewandisaseriesofstraightlinescalledtangentsconnectedbycircular.Inmodernpracticeitiscommontointerposetransitionorspiralcurvesbetweentangentsandcircularcurves.Alignmentmustbeconsistent.Suddenchangesfrom
7、flattosharpcurvesandlongtangentsfollowedbysharpcurvesmustbeavoided;otherwise,accidenthazardswillbecreated.Likewise,placingcircularcurvesofdifferentradiiendtoend(compoundcurves)orhavingashorttangentbetweentwocurvesispoorpracticeunlesssuitabletransitionsbe
8、tweenthemareprovided.Long,flatcurvesarepreferableatalltimes,astheyarepleasinginappearanceanddecreasepossibilityoffuture10河南理工大学本科毕业设计专业外文翻译obsolescence.However,alignmentwithouttangentsisundesirableontwo-laneroadsbecausesom
