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时间:2020-03-26
《立洲RCC拱坝施工期度汛温控防裂措施分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第36卷第4期人民黄河Vo1.36.No.42014年4月YELLOWRIVERApr.,2014【水利水电工程】立洲RCC拱坝施工期度汛温控防裂措施分析马超,裴亮,吴震宇,徐建江,陈建康(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)摘要:碾压混凝土拱坝过水度汛期的温控措施的合理选取十分关键,如处理不当,大坝很可能因过水冷激产生裂缝,甚至危及大坝主体安全。以立洲高碾压混凝土拱坝为研究对象,应用有限元计算软件ANSYS12.1分析了大坝拱冠位置坝段在有保温措施和无保温措施条件下的应力状态,结果表明:对于三
2、个典型高程,有保温措施下坝体内外温差均有近5℃的降幅;10d龄期过水与5d龄期过水在有保温措施的条件下均能满足防裂要求,即坝体温度产生的最大拉应力小于要求的相应龄期混凝土的抗拉强度;10d龄期过水防裂效果相比5d龄期过水的更好,但采取5d龄期过水能加快施工进度。关键词:过水度汛;三维有限元法;保温措施;防裂;RCC拱坝中图分类号:TV315文献标志码:Adoi:10.3969/j.issn.1000—1379.2014.04.035TemperatureControlSimulationandCracksPreventionAn
3、alysisfortheLizhouRCCArchDamConstructionPeriodDuringtheFloodSeasonMAChao,PEILiang,WUZhen—yu,XUJian-jiang,CHENJian—kang(StateKeyLaboratoryofHydraulicsandMountainRiverEng.,SichuanUniversity,Chengdu610065,China)Abstract:Itisveryimportanttoselectthereasonabletemperaturec
4、ontrolmeasuresofRCCarchdamduringthefloodseason.Ifitisnothandledproperly,therewillbelikelytocausefracturebecauseoftheovel~owwatercoldshockthatwillendangerthesafetyofdam.TakingLizhouRCCarchdamastheresearchobject,usingthefiniteelementcalculationsoftwareANSYS12.1analyzed
5、thestressconditionofthearchdamcrownwithheatpreservationmeasuresandwithoutheatpreservationmeasures.Theresultsshowthat:forthreetypicalelevations,thetemperaturedifferencebetweeninsideandoutsideofthedamarenearly5oCdeclinedwiththeheatreservationmeasures;10dageand5dagewith
6、theheatpreservationmeasurescalbothsatisfytheanti-crackingrequirement,whichmeansthebiggestdamtemperatureproducetensilestressislessthantherequirementsoftherel—evantageconcretetensilestrength;10dageofwateranti—crackingefectisbetterthanthatofthe5dage,buttake5daysageofwat
7、eroverflowCan.speeduptheconstructionprogress.ThiswillprovideareferenceaboutthecrackspreventionofdamduringthefloodseasonforLizhouarchdam.Keywords:RCCarchdam;floodpreventionwithoverflowdam;Three—DimensionalFiniteElementMethod;insulationmeasures;cracksprevention裂缝是影响混凝土
8、耐久性的关键因素,因此混凝土的防裂坝段有限元模型,运用ANSYS12.1软件对过水度汛期间坝体措施应引起足够的重视。与常规混凝土相比,碾压混凝土添加的温度场和温度应力场进行数值模拟研究,分析了坝体保温材了大量粉煤灰,水泥用量相对减少,因此水泥水化过程中绝热料对过
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