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1、StudyofSafetyGradeofHighwayTunnelXiaYongxuWangYongdongDengNianbingZhaoFeng(HighwayCollege,Chang'anUniversity,Xi'an,710064,China)Abstract:Atpresent,becauseoflackinghighwaytunnelclassificationofsafetygradeanddesignstandardofsafetyestablishmentsinChina,thedesignerscan
2、dotheseworkbasingonthemselves'experiencesandunderstanddegree,somanysafetyhiddentroublesmustbebrought.Fivefactorsandfourrelationstoaffectsafetygradeofhighwaytunnelareputforward,thelengthoftunnel(basicdemarcativetarget)andthetraffic(dynamictarget)mustbeconsideredinco
3、mpartmentalizingsafetygradesofhighwaytunnel.BasedontheactualstatusandtechniquelevelofbuildinghighwaytunnelinChina,thesafetygradeofhighwaytunnelisdividedintofivegrades:I,II,III,IV,Vwithregarding0.5km,1.0km,3.0km,5.0km,10.0kmascharacteristiclengthoftunnelandselecting
4、10000vehicle/dayasthelowesttraffic.Atthesametime,thebasicprogramsandmeanstostudysafetyestablishment'sstandardofhighwaytunnelareputfonvard,Keywords:tunnelengineering;highwaytunnel;safetygrade1.PrefaceBytheendof2004,morethan2,300highwaytunnelshadbeenbuiltinourcountry
5、,withtotallengthofover1,100km.Atpresent,9tunnels,eachwithlengthofover6km,areunderconstruction.Withcompletionof18.004kmhighwaytunnelofQinlingMt.ZhongnaninShaaniProvinceand8.67kmLongtanTunnelinHubeiProvince,China'stechnicallevelofbuildingtunnelwillbegreatlyenhanced・
6、Tostandardizeandguidedesignandconstructionofhighwaytunnel,MinistryofCommunicationsofourcountryhasissued《DesignCriterionofHighwayTunne1》《TechnicalCriterionofHighwayTunnelConstruction》121and《DesignCriterionofVentilationandIlluminationforHighwayTunnel》⑶oneafteranother
7、,which,nodoubt,providebasicguaranteebylawforconstructionqualityandnormaloperationofhighwaytunnel.Withincreasinglyaddednumbersoftunnelsbeingputintooperationandoccurrenceofextra-longtunnel,however,issueofsafelyforhighwaytunnelbecomesincreasinglyprotruding.Intheexisti
8、ngcriterion,thereislesscontentinvolvedwithsafetyissueofhighwaytunnel,so,asaresult,designersduringthedesigningpracticeeithersettoohighalevelofsafe
