观音岩水电站混凝土梁三点弯曲试验的数值模拟.docx

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学兔兔www.xueut

2015年第4期(总第306期)

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混凝土

Concrete

理论研究

THEORETICALRESEARCH

doi:10.3969/j.issn.1002-3550.2015.04.004

观音岩水电站混凝土梁三点弯曲试验的数值模拟

马悦，戴峰，徐奴文1,沙椿2,何刚2

(1.四川大学水力学与山区河流开发保护国家重点实验室，四川成都610065;

2.中国水电顾问集团成都勘测设计研究院，四川成都610072)

摘要：以观音岩水电站现场切割的坝体混凝土梁为物理模型，利用真实破坏过程分析软件RFPA3对该混凝土梁进行三点弯试验的数值模拟，观察并分析混凝土裂缝的起裂、扩展直至试件宏观破坏的整个过程，将数值模拟得到的混凝土梁不同开裂过程对应的声发射、抗弯强度以及断裂破坏模式与现场物理试验结果对比分析，发现混凝土梁的三点弯曲数值试验得到的破坏特征与现场试验结果基本吻合。研究结果表明该数值模型的实用性，为进一步研究观音岩水电站坝体裂缝形成机理和揭示坝体裂纹扩展规律奠定基础。

关键词：三点弯曲试验；混凝土；数值模拟；微震监测；观音岩水电站

中图分类号：TU528.01文献标志码：A文章编号：1002-3550(2015)04-0014-04

NumericalsimulationofthreepointbendingtestofconcretebeamfromGuanyinyan

MAYue1,DAIFeng1,XUNuwen1,SHAChun2,HEGang2

(1.StateKeyLaboratoryofHydraulicsandMountainRiverEngineering,CollegeofWaterResourceandHydropower,

SichuanUniversity,Chengdu610065,China;2.ChengduHydroelectricInvestigationandDesignInstitute,

ChinaHydropowerEngineeringConsultingGroupCo.,Chengdu610072,China)

Abstract:AccordingtothephysicalmodelofthedamconcretebeamcutfromGuanyinyanhydropowerstation,numericalsimulationonthreepointbendingtestsoftheconcretebeamwasconductedbytheRealisticFailureProcessAnalysis(RFPA3°).Thefalureprocessesincludingcracksinitiation,propagationandmacro-damageoftheconcretebeamwereinvestigatedandanalyzed.Thecorespondinga-cousticemission,bendingstrength,andfracturemodeduringdifferentfailureprocessesoftheconcretebeamobtainedfromnumericalsimulationwerecomparedwiththosefromthephysicalexperimentonsite.Theresultsrevealthatthefailurecharacteristicsofconcretebeambetweennumericalsimulationandon-sitetestsareinagoodagreement.Thepracticabilityofthenumericalmodelisthusvalida-

ted.Moreover,somereferencescanbeprovidedforanalyzingtheformationmechanismofdamcracksandrevealingdamcrackspropa-gationlawofGuanyin