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摘要: 考虑混凝土的高应变率效应,构建重力坝水下爆炸全耦合模型,运用显式动力分析程序LS-DYNA, 对水下爆炸冲击荷载作用下大坝动态响应进行分析,探讨大坝可能破坏模式及相应的破坏机制。研究 表明,大坝破坏模式不仅与坝体的自身动力特性有关,还取决于炸弹起爆时的水下深度、爆心距及炸弹药量; 重力坝坝头是抗爆性能薄弱部位,大坝可能破坏模式为上游迎爆面的爆炸成坑破坏、坝顶及坝下游面的震塌 破坏、坝头与上游直面交接处及下游折坡附近的脆性冲切破坏并出现贯穿性裂缝破坏。Abstract: StrainrateeffectofconcretedamwastakenintoconsiderationintheestablishmentofgravitydamfullycoupledmodelbyusingsoftwareLS- DYNA.Numericalsimulationmethodwasusedto studythedynamicresponseofthedamsubjectedtostrongunderwaterexplosionshockloading.The possiblefailuremodeandcorrespondingfailuremechanismofconcretegravitydamwerediscussed.It isfoundthatthefailuremodesofdamunderblastloadingdependnotonlyonitsowndynamiccharacteristics, butalsoontheunderwaterdepth,theblastcenterdistanceandthebombdosage.Thehead ofagravitydamisoneofweakpartsforantiknockperformance.Possiblefailuremodesofadamincludeexplosiontopitsatupstreamfaceconcretezoneswhichmeetexplosive, explosion-inducedcollapseatcrestanddownstream, brittlepunchingatjointoftheheadandupstreamplanesandnearthe downstreamslopewithpenetratingcracks.
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