1.2路基分类及结构形式的介绍课件讲解.pptx

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1.2路基分类及结构形式的介绍课件讲解.pptx

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RoadbedConstructionTechnologyBasicknowledgeofRoadbedEngineering

BasicrequirementsofroadbedThestructureoftheroadbedSubgradegeometricelements

Basicrequirementsofroadbed1.EmbankmentDefinition:subgradewithdesignelevationhigherthanoriginalgroundelevationandfilledwithsoilorstoneonnaturalground.Features:goodventilation,convenientdrainage,fillingpropertiesandcompactiondegreecanbecontrolledasrequired.

BasicrequirementsofroadbedTheembankmentisstructurallydividedintoroadbedandembankment,asshowninTable1-1.SubgradepositionDepthbelowthetopsurfaceofroadbed(m)Roadbed0～0.3LowerroadbedLight,mediumandheavytrafficloadlevels0.3～0.8Extraheavyandextremelyheavytrafficloadlevels0.3～1.2UpperembankmentLight,mediumandheavytrafficloadlevels0.8～1.5Extraheavyandextremelyheavytrafficloadlevels1.2～1.9LowerembankmentLight,mediumandheavytrafficloadlevels＞1.5Extraheavyandextremelyheavytrafficloadlevels＞1.9Table1-1divisionofroadbedandembankment

BasicrequirementsofroadbedDivisionofroadbedandembankment0～0.3Roadbed0.3～1.2Lowerroadbed1.2～1.9Upperembankment＞1.9LowerembankmentExtraheavyandextremelyheavytrafficloadlevels0～0.3Roadbed0.3～0.8Lowerroadbed0.8～1.5Upperembankment＞1.5LowerembankmentLight,mediumandheavytrafficloadlevels

BasicrequirementsofroadbedAccordingtothefillingheightLowembankment:H＜1.5m;GeneralEmbankment:within1.5m＜h＜18m;Highembankment:H＞18m(soil),H＞20M(stone).AccordingtotheconditionsandreinforcementtypesSubmergedembankmentToeprotectionembankmentChannelexcavationandembankmentfillingClassificationofembankment

BasicrequirementsofroadbedCommoncrosssectionformofembankmentClassificationofembankment

BasicrequirementsofroadbedClassificationofembankmentStructuralrequirementsforgeneralembankmentsandlowembankmentsMeettheminimumfillingheightrequirements;Sincetheworkingareamay