多次落石沖擊下棚洞結(jié)構(gòu)動(dòng)力響應(yīng)數(shù)值模擬

中圖分類(lèi)號(hào)：O344；TU443 國(guó)標(biāo)學(xué)科代碼：13015 文獻(xiàn)標(biāo)志碼：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崩塌落石發(fā)生的高頻性及運(yùn)動(dòng)特征的強(qiáng)隨機(jī)性，導(dǎo)致對(duì)其發(fā)生時(shí)間、運(yùn)動(dòng)路徑及造成危害等方面的準(zhǔn)確預(yù)測(cè)十分困難[1-2]。（剩余18938字）