《河南水利与南水北调》2022年第12期试验与研究渗透溶蚀作用下帷幕性态对坝基渗流的影响曹玉丹(河南省河口村水库管理局,河南郑州450003)摘要:帷幕是影响大坝工程安全的重要因素之一,其防渗性能在坝基水渗透溶蚀作用下会发生衰减。为研究帷幕初始性态不同时,对运行一段时期后帷幕耐久性及坝基渗流量的影响,首先建立了渗流场、化学场以及固相介质孔隙度等多场耦合模型,然后考虑帷幕整体性变化和局部存在薄弱部位两种情况。前者通过局部敏感性分析,结果表明不同阶段各性态的影响大小有所不同,在初始阶段,透水率>深度>宽度,而在运行10年后,表现为透水率>宽度>深度;对于后者,模拟结果表明,坝基水对薄弱部位的侵蚀速率会明显加快,待该区域内帷幕的可溶性组分全部溶蚀后,继续向该部位上下两侧扩展,从而加速了整个帷幕的溶失。基于以上研究可为具体工程实际中帷幕设计提供科学指导。关键词:帷幕性态;渗透溶蚀;坝基渗流量;多场耦合中图分类号:TV223.43文献标识码:A文章编号:1673-8853(2022)12-0085-03EffectofInitialBehaviorofCurtainonSeepageFlowofDamFoundationunderOsmoticDissolutionCaoYudan(HekouVillageReservoirAdministrationofHenanProvince,Zhengzhou450003,China)Abstract:Curtainwasoneoftheimportantfactorsaffectingthesafetyofdamengineering.Itsimperviousperformanceisweakenedundertheactionofseepagedissolutionofdamfoundationwater.Inordertostudytheinfluenceofdifferentinitialbehavioroncurtaindurabilityandseepageflowofdamfoundationafteraperiodofoperation,amulti-fieldcouplingmodelofseepagefield,chemicalfieldandporestructureofsolidmediumisbuiltupfirstly.Thenthetwosituationsincludingoverallchangeofcurtainandtheexistenceofweakpartslocallyareconsidered.Localsensitivityanalysisoftheformeroneshowsthattheinfluenceofdifferentcharacteristicsisdifferentindifferentstages.Attheinitialstage,theeffectofthepermeabilityislargestandthenthedepthandthewidth.Whileafter10yearsofoperation,theorderchangedtothepermeability,thewidthandthenthedepth.Asforthelatter,thesimulationresultsshowthatthedissolutionrateintheweakpartsissignificantlyaccelerated.Thenitcontinuedtoexpandtotheupperandlowersidesofthispartafterallthesolublecomponentsofthecurtainint...