DOI:10.11883/bzycj-2021-0503城市地下浅埋管沟可燃气体爆炸的灾害效应(Ⅱ):影响因素分析及后果评估*杨石刚1,蔡炯炜1,2,杨亚1,孙文盛1,门敬敏1(1.陆军工程大学爆炸冲击防灾减灾国家重点实验室,江苏南京210007;2.73021部队,浙江杭州310012)摘要:为系统地评估城市地下浅埋管沟可燃气体爆炸的灾害后果,利用FLACS软件模拟得到了可燃气体的爆炸荷载,并分析了该灾害对建筑物破坏和人员伤害的危险距离及影响因素。结果表明:当点火位置靠近管沟中间位置时,超压峰值和危险距离较大;泄爆口的大小对危险距离的影响不大,而对离泄爆口较近处的超压峰值影响较大;气云长度越长,超压峰值和危险距离也越大,但增幅逐渐减小直至不变;管沟的横截面面积越大,超压峰值和危险距离也越大;为避免造成严重的灾害后果,高耸建筑物和密集人群应远离泄爆口。关键词:城市地下浅埋管沟;可燃气体;爆炸冲击波;危险距离;超压峰值;气云长度;后果评估中图分类号:O382国标学科代码:13035文献标志码:ADisastereffectsofcombustiblegasexplosioninanurbanshallow-buriedpipetrench(Ⅱ):influencingfactoranalysisandconsequenceevaluationYANGShigang1,CAIJiongwei1,2,YANGYa1,SUNWensheng1,MENJingmin1(1.StateKeyLaboratoryofDisasterPreventionandMitigationofExplosionandImpact,ArmyEngineeringUniversityofPLA,Nanjing210007,Jiangsu,China;2.73021TroopofPLA,Hangzhou310012,Zhejiang,China)Abstract:Gasexplosionaccidentsoccurringinurbanshallowly-buriedpipetrenchescancauseenormouscasualtiesandpropertydamagethroughshockwavestransmittingfromexplosionvents,whilemanyinfluencingfactorsexistintheprocessofgasexplosion.Inordertoevaluatethedisasterconsequencesofcombustiblegasexplosioninanurbanshallow-buriedpipetrenchsystematically,thedifferentconditionswereestablishedincludingdifferentignitionpoints,differentventsizes,differentgascloudlengthsanddifferenttrenchcross-sectionalareas.ThecomputationalfluiddynamicssoftwareFLACSwasusedtoperformnumericalsimulation.AndtheexplosionloadofthecombustiblegaswasobtainedintheX,Y,andZdirections.Thecharacteristicsoftheexplosionoverpressurepeakdistributionwereanalyzed,andtheloadgenerationmechanismwasillustratedbyanalyzingtheexplosionprocess.Theove...