空间任意角度入射下深厚覆盖层坝基防渗墙响应特性研究

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关键词：混凝土防渗墙；堆石坝；P波三维斜入射；非一致输入；深厚覆盖层 中图分类号：TV331；TV641.4 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202403020

Research on the response characteristics of cut-off walls in deep overburden dam foundctions under spatial arbitrary angle incidence

LI Xiangjiang，SONG Zhiqiang，LI Chuang，LIU Yunhe （StateKeyLaboratory of Weter Engineering Ecology and Environment in Arid Area， Xi'anUniversity of Technology，Xi'an71Oo48，China）

Abstract：Thenon-uniforminputofgroundmotionhasasignificantefectonthedynamicresponseofaconcretecutoff wallin deepoverburden.Inordertoexploretheresponsecharacteristicsofthecut-offwallundernon-uniformgroundmotioninputatthe overburdensite，thisstudyestablishesthe inputmethodofP-wavethre-dimensionaloblique incident wave motionunderany incidentangleinspacebasedonthewavefielddecompositionmethodandtheviscoelasticartificialboundarymethod，andvalidatesthe inputmethod.Nineonuniforinputconditionsweredesignedtoinvestigatetheinfluenceofdierentazimuthalandobliqueinci denceanglesonthedynamicresponseofthecut-offwallunderacombinationof incidence.Theresultsshowthatthe maximumacceleration in the down-river direction of the cut-off wall at α=60∘ and γ=0∘ incidence is 3.89 times that of vertical incidence，and themaximum acceleration in the axial direction of the dam at α=60∘ and γ=90∘ incidenceis 8.93 timesthat of vertical incidence. Non-uniform inputcauses a significantincreaseinthe transverse riverward tensile stresses intheimpermeable wall，upto 3.53 timesthatoftheverticalincidence，withasignificantchangeinthepeakdistributionregion，andtheverticalcompressivestrees are significantly reduced atan oblique incidence angle of 90∘ incidence compared to the vertical incidence.The traditional vertical incidence methodcanignore the expansionareaof tensile stressofthecutoffwallunder nonuniform input，sothenon-uniforityof ground motionshould beconsidered whenanalyzing thedynamicresponseofthecutoffwallinadeepoverburden layer.

Keywords：concretecutoffwall;ockfildam;three-dimensionalobliqueincdenceofPwave;nonuniforinput;depovrburden layer

中国西南地区高山峡谷众多，建坝必须面对河床覆盖层深厚、强震频发等复杂问题。（剩余15370字）