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摘要: 通过数字高速摄影技术和动态电测技术,对马蹄形地下防护结构在冲击载荷作用下的动态破坏过 程进行了缩比模型实验研究。结果表明,底部是整个马蹄形结构最为脆弱的部分,需要重点防护。在结构内 层加装钢板或其他高强度防护材料会显著提高该种结构的抗冲击能力。结构的破坏是一个动态累积的过程, 而材料的抗拉强度直接影响这类结构的抗毁伤能力。通过获得的实验数据验证了采用LS-DYNA 有限元软 件对于地下防护结构在冲击载荷作用下破坏过程进行研究的可行性和准确性。Abstract: Byadoptingthedigitalhigh-speedphotographyanddynamicelectricalmeasurementtechnique, ascale-reducedmodelwasdesignedtoexperimentallyinvestigatethedynamicdamageprocess ofahorseshoe-shapedundergroundprotectivestructureunderimpactloading.Experimentalresults indicatethatthebottomistheweakestpartofthehorseshoe-shapedstructureandneedbeprotected excessively.Theshockresistanceofthiskindofstructurecanbeevidentlyimprovedbyaddingsteel platesorotherhigh-strengthprotectingmaterialsinitsinnerlayer.Thescale-reducedexperimentwas simulatednumericallybyusingtheLS-DYNAfiniteelementsoftware.Thenumericalresultsareinagreementwiththeexperimentalresults. ItdisplaysthattheLS-DYNAfiniteelementsoftwareisfeasibletobeusedtosimulatethedynamicdamageprocessofthescale- reducedmodelforhorseshoeshapedundergroundprotectivestructures.
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