路基石方爆破施工方案

TbilisiTbilisiTbilisiTbilisiRailwayRailwayRailwayRailwayBypassBypassBypassBypassProjectProjectProjectProjectNewNewNewNewLineLineLineLineSubgradeSubgradeSubgradeSubgradeStoneworkStoneworkStoneworkStoneworkBlastingBlastingBlastingBlastingConstructionConstructionConstructionConstructionMethodMethodMethodMethodStatementStatementStatementStatementDraftedby：Reviewedby：Approvedby：JVofCRCC23BGandJSC“Khidmsheni”1stSep.20111SubgradeSubgradeSubgradeSubgradeStoneworkStoneworkStoneworkStoneworkBlastingBlastingBlastingBlastingConstructionConstructionConstructionConstructionMethodMethodMethodMethodStatementStatementStatementStatementI.I.I.I.ProjectProjectProjectProjectIntroductionIntroductionIntroductionIntroductionTotallengthofTbilisiRailwayBypassProjectofGeorgiais38.612km;including28.73kmnewlybuilddoublerailwaylineand9.96kmreconstructionofexistingline.With2newlybuildstationsand5tunnels,with1368mbridgesandthequantityofearthworkandstoneworkis8500000m3approximately.Designedspeedofoperationis100km/handthegaugeis1520mm.Mileageofthissection’ssubgradeisPK197+00-PK219+20,totallengthis2220m.Poordevelopmentofgroundvegetationandmostlyisgrassland,belongstoterrainofdenudedhills.Volumeofearthworkandstoneworkwithinthissectionis809000m3approximatelyincludingabout447502.5m3fillingearthworkandstonework,about418809.3m3excavationearthworkandstonework,excavationandbackfillingisbasicallybalanced;topsoilcleaningareais62000m2.Designedsurfaceofsubgraderevealsasshapeoftriangleandtheheightofarchatmiddleofsubgradeis0.2m,transversaldrainageslopeof4%isarrangedfromcenterlinetotwosidesofsubgrade.Itremainsastriangleshapewhenthesubgradeisbroadenedinthecurvesection.FromPK117+900toPK122+00Theroutepassesonfilling,whichwillbesetonravine.Therightsideoftheravineiscoveredwithleanclaysof10.0mcapacityfromthesurface–EGE-3;ChokrakiansandstonesEGE-13(70%),clays(20%)andconglomerates(10%)areobservedunderleanclays.ThebottomoftheravineisfilledupwithswellingclaysofvariousconsistenceEGE-7andEGE-8.TheleftsideoftheravineiscoveredwithswellingclaysofsmallcapacityEGE-8,underwhichchangeabilityofEGEcarbonateclaysandsandstonesisobserved.Usepresplittingblastingmethodtoblastthestonelayerwithinthescopeoflane,however,smoothsurfaceblastingissuitableforblastingthestonesatthesideslopetocreatepermanentsideslope.AtsectionPK142+20-PK143+80,14munderthegroundstonelayerwasfound,mainlyconstitutedbysandstone,blastingmethodisnecessaryduringconstructionofsubgrade.Usepresplittingblastingmethodtoblastthestonelayerwithinthescopeoflane,however,smoothsurfaceblastingissuitableforblastingthestonesatthesideslopetocreatepermanentsideslope.AtlefthillsideofPK178+40-PK179+80stonelayerwasfound,mainlyconstitutedbysandstone,Usepresplittingblastingmethodtoblastthestonelayerwithinthescopeoflane,however,smoothsurfaceblastingissuitableforblastingthestonesatthesideslopetocreatepermanentsideslope.FromPK199+60toPK201+40arailwaypassesinthedepressionlandofwhichthemaximumheightisupto20m.Theroutepassesintheheadlandpartofthesteepslopeandatfavorablestratumwasfoundattheleftsideofdepression,therightsideislesser.Usepresplittingblastingmethodtoblastthestonelayerwithinthescopeoflane,2however,smoothsurfaceblastingissuitableforblastingthestonesatthesideslopetocreatepermanentsideslope.DepressionsituatesonthebasicrockinsectionPK203+60-PK204+40-sandstone(60%)andclays(40%),ofwhichtheleftsideslopeisstonelayerandthetypeissandstone,thusatthislocationblastingmethodisnecessary.Usepresplittingblastingmethodtoblastthestonelayerwithinthescopeoflane,however,smoothsurfaceblastingissuitableforblastingthestonesatthesideslopetocreatepermanentsideslope.II.II.II.II.BlastingBlastingBlastingBlastingScenarioScenarioScenarioScenarioandandandandParametersParametersParametersParameters(I)(I)(I)(I)DeterminationDeterminationDeterminationDeterminationandandandandDeclarationDeclarationDeclarationDeclarationofofofofBlastingBlastingBlastingBlastingScenarioScenarioScenarioScenario1.1.1.1.DeterminationDeterminationDeterminationDeterminationofofofofBlastingBlastingBlastingBlastingScenarioScenarioScenarioScenarioWhenblastingmethodisforeseentobeadoptedduringactualconstruction,mainissuesneedtobetakenintoconsiderationare:first,howtoimprovetheutilizationrateofblastholefirstly,second,howtocontroltheexcavationoutlineandblastingvibrationtothestratum.Treatthesetwoguidingideologiesasbasisforselectionofblastingscenario.Forworkingoutatechnicallyfeasible,economicandreasonable,safeandreliableblastingscenario,itrequirestodositereconnaissanceandgathersiteinformationatfirst.Themainpurposeistofamiliarwiththeblastingobjects,quantity,dimension,structureandmaterial,locationandconditionsofgeologyandenvironmentaroundtheblastingsiteofwhichtheenvironmentshouldincludethestructuresandfacilitiesatgroundandunderground,relativedistancebetweenthestructuresandtheblastingpointandlike.Basedontheactualinformationthatwasfullygraspedfromjobsite,accordingtotherequirementofblastingtasksandsafetypurposetakevariousscenariosfordoingcomparisonandworkoutreasonable,operableblastingscenariolastly.2.Declarati