多次落石冲击下棚洞结构动力响应数值模拟

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中图分类号:O344;TU443 国标学科代码:13015 文献标志码:A

Abstract:To exploring the dynamic response characteristics of the shed-tunnel structureunder multiple rockfal impacts,an FEM-SPH coupled numerical model is established based on ANSYS/LS-DYNA and is also tested with the data before.Then, the model iscombined with the fullrestart technique tostudythe efectsofthe shed-tunnel structuredynamicresponseunder multiplerockfallimpactsbonsideringfouractors,e.g.ockfallimpactvelocityockfallmassimpactangleadckll shape.Theresultsshowthatthe impact force,bufer topimpact displacement,roof displacement and plasticstrainoftheshedtunnel are positivelycorelated withtherockfall mass,velocityandangle.The impact force,roofdisplacement and plastic strainoftheshed-tunnelstructuregeneratedbythecuboidrockfallimpactarealllargerthanthoseoftesphericalrockfall,and theimpact displacement generatedbythesphericalrockfallimpactislarger thanthatofthecuboid.Forthecuboidrockfal,the impactdisplacement,roof displacementandplastic strainare negativelycorelated withthecontactarea.Under the multiple rockfall impacts,the peak impact force usually increases firstly and then tends to be stable.

Keywords:shed-tunnelstructure;dynamicresponse; theFEM-SPHcoupled numericalmodel;impactforce; multiplerockfals崩塌落石发生的高频性及运动特征的强随机性,导致对其发生时间、运动路径及造成危害等方面的准确预测十分困难[1-2]。(剩余18938字)

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