1.4路基断面形式的简介课件讲解.pptx

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1.4路基断面形式的简介课件讲解.pptx

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RoadbedConstructionTechnologyBasicknowledgeofRoadbedEngineering

BasicrequirementsofroadbedEmbankmentreferstothefilledsubgradehigherthantheoriginalground.Structurally,itisdividedintoupperembankmentandlowerembankment,andtheupperembankmentrefersto0.80Forthefillingwithin1.50m,thelowerembankmentreferstothefillingbelowtheupperembankment.

BasicrequirementsofroadbedAccordingtothefillingheightofembankment,itisdividedintolowembankment,generalembankmentandhighembankment.Thefillingslopewithheightlessthan1mbelongstolowembankment;ThefillingslopewithheighthigherthanLMandlowerthan20misageneralembankment;Highembankmentreferstothefillslopewithheighthigherthan20m.EmbankmentclassificationSlopeheightLowembankmentLessthan1mGeneralembankmentAbove1mandbelow20mHighembankmentAbove20mDependingontheconditionsoftheembankmentandthetypeofreinforcement,thereareriverembankment,toeprotectionembankment,channelexcavationandfillingembankment,etc.Astheembankmentiswellventilatedandconvenientfordrainage,anditisfilledmanuallyormechanicallyinlayers,thenature,stateandcompactnessofthefillercanbecontrolledasrequired.Therefore,embankmentsubgradehasfewerdiseases,whichisoftenusedinengineering.

BasicrequirementsofroadbedCuttingreferstotheexcavatedsubgradelowerthantheoriginalground.Thefigurebelowshowsseveralcommonformsofcutting,includingfullexcavationsubgrade,abutmentsubgradeandsemicavesubgrade.CrosssectionofexcavatedSubgrade

BasicrequirementsofroadbedTheexcavationofcuttingdestroysthenaturalbalanceoftheoriginalground,anditsslopestabilitymainlydependsongeology,hydrology,slopegradientandslopeheight.Theexcavationslopeshallbesetinstraightline,brokenlineorstepshapeaccordingtothevisualheightandrockandsoilconditions,andtheappropriatesloperate