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I摘要本设计是从信阳到商城某段二级公路的设计，该段路线总长为3054m。本设计中设计车速为80km/h，双向两车道。本设计是在对交通量进行分析，查找相应的技术规范的基础上，确定出公路的技术等级以及设计需要的各种参数，最终确定采用二级公路的技术指标进行设计。结合周围的地形情况进行了平面线形设计，平面线形中有三个转角。纵断面的设计中有两个竖曲线，满足平纵线形组合设计中的各种要求。在横断面的设计中，确定了横断面组成及各种要素后，绘制出横断面图。本设计中路面设计采用沥青路面进行设计，主要包括结构层的拟定和设计层厚度计算。涵洞设计主要是在拟定结构尺寸后进行各种强度的验算。设计中结合地形及周边环境条件，通过两条线路方案的比选，最终确定最佳方案。关键词：二级公路；纵断面；横断面；沥青路面；涵洞IIAbstractThisdesignisasecondaryroaddesignfromXinyangtoShangchengandthetotallengthofthesectionis3054m.Thedesignspeedis80km/handtheroadhastwolanes.Theparameterswhichareneededinthedesignaredefinedbyanalyzingthetrafficandsearchingthecorrespondingtechnicalspecification.Finallythesecondaryroad’stechnicalspecificationisdesigned.Basedonthesurroundingterrain,thealignmentofthehighwayisdesigned,whichhasthreecorners.Therearethreeverticalcurvesinthedesignofverticalalignment,whichallmeetthedesignrequirementofthelinearcombination.Inthecrosssectiondesign,thecrosssectiondiagramsaredrawnafterdeterminingthecompositionandcrosssectionelements.Thedesignoftheasphaltpavementmainlycontainstheselectionofthestructurelayerandthecalculationofthelayerthickness.Theintensionofthestructureischeckedaftertheselectionofthedimensionsofthestructureintheculvertdesign.Thedesigniscombinedwiththeterrainandsurroundingenvironmentconditions,andthroughthecomparisonoftwolineprograms,thebestsolutionisultimatelydetermined.Keywords：Secondaryroad,verticalsection,crosssection,Asphaltpavement，culvertIII目录第一章绪论............................................................................................................11.1概述...................................................................................................................11.2选题意义...........................................................................................................11.3设计概况...........................................................................................................2第二章公路技术等级的确定....................................................................................32.1公路技术等级...................................................................................................32.2公路等级的确定...............................................................................................42.3二级公路技术指标核算...................................................................................52.4公路技术标准....................................................................................................6第三章公路平面设计..............................................................................................103.1选线的一般原则.............................................................................................103.2平原微丘地区选线原则.................................................................................103.3选线方法及步骤.............................................................................................133.4方案的拟定与初步比选.................................................................................143.5平面线形设计.................................................................................................153.5.1线形要素的计算.........................................................................................................153.5.2逐桩坐标的计算.........................................................................................................19第四章纵断面设计..................................................................................................274.1纵断面设计原则.............................................................................................274.2纵坡设计要求.................................................................................................284.3竖曲线设计.....................................................................................................304.3.1竖曲线设计.................................................................................................................304.3.2竖曲线的计算.............................................................................................................314.4平、纵线形组合.............................................................................................34IV第五章横断面设计..................................................................................................355.1横断面设计原则.............................................................................................355.2横断面的组成.................................................................................................365.3平曲线加宽设计.............................................................................................385.4超高设计.........................................................................................................38第六章路基设计......................................................................................................436.1路基设计的内容与要求.................................................................................436.1.1路基断面设计.............................................................................................................436.1.2路基设计要求...................................................................................