简介:OnMarch26,2010anunderwaterexplosion(UWE)ledtothesinkingoftheROKSCheonan.TheofficialMultinationalCivilian-MilitaryJointInvestigationGroup(MCMJIG)reportconcludedthatthecauseoftheunderwaterexplosionwasa250kgnetexplosiveweight(NEW)detonationatadepthof69mfromaDPRK'CHT-02D'torpedo.KimandGitterman(2012a)determinedtheNEWandseismicmagnitudeas136kgatadepthofapproximately8mand2.04,respectivelyusingbasichydrodynamicsbasedontheoreticalandexperimentalmethodsaswellasspectralanalysisandseismicmethods.ThepurposeofthisstudywastoclarifythecauseoftheUWEviamoredetailedmethodsusingbubbledynamicsandsimulationofpropellersaswellasforensicseismology.Regardingtheobservedbubblepulseperiodof0.990s,0.976sand1.030swerefoundincaseofa136NEWatadetonationdepthof8musingtheboundaryelementmethod(BEM)and3Dbubbleshapesimulationsderivedfora136kgNEWdetonationatadepthof8mapproximately5mportsidefromthehullcenterline.Hereweshowthroughanalyticalequations,modelsand3Dbubbleshapesimulationsthatthemostprobablecauseofthisunderwaterexplosionwasa136kgNEWdetonationatadepthof8mattributabletoaROKlittoral'landcontrol'mine(LCM).
简介:崖门大桥引桥、主桥,墩身均高达40m以上,索塔高77m。经方案比选,全桥墩身施工均采用爬模施工方法。阐述了爬模施工的特点,介绍爬模施工的工艺。
简介:崖门大桥12#、13#主墩承台长30.5m、宽21.8m、高6.5m,承台设计为高桩承台。介绍大体积混凝土承台施工中承台封底质量、承台混凝土质量及大体积砼水化热的控制等。
简介:崖门大桥主梁采用牵索挂篮悬臂浇筑法施工。介绍施工期间线形监控测量监测的项目、施测方法及其精度。理论分析和精度估算结果表明,所拟订的变形监测方案能满足该桥施工监控的要求,可作为测量监测的作业依据。