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时间:2019-05-13
《基于变形监测资料的混凝土坝时变参数优化反演》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第26卷增1岩石力学与工程学报Vol.26Supp.12007年7月ChineseJournalofRockMechanicsandEngineeringJuly,2007基于变形监测资料的混凝土坝时变参数优化反演黄耀英,黄光明,吴中如,沈振中(河海大学水利水电工程学院,江苏南京210098)摘要:基于变形监测资料建立混凝土坝与基岩时变参数反演三步法:首先利用监控模型分离出的水压分量反演大坝和基岩的弹性模量;然后利用分离出的时效分量趋近值反演黏性元件的弹性参数;最后利用时效分量的过程值反演黏性元件的黏滞系数。以龙羊峡重力拱坝为例,应用上述方法,反演参数较敏感的时变参数,从力学机制上解析
2、龙羊峡重力拱坝拱冠梁在2530~2610m高程的径向时效位移向上游变位的原因。其原因是坝体和基岩黏滞系数较大,坝体自重引起向上游变位的时效变形需要较长时间才能稳定;另外,龙羊峡水库长期低水位运行也是原因之一。关键词:水利工程;变形监测资料;时变参数;优化反演;径向时效位移中图分类号:TV642.4文献标识码:A文章编号:1000–6915(2007)增1–2941–05OPTIMIZATIONINVERSIONOFCONCRETEDAM′STIME-DEPENDENTPARAMETERSBASEDONDEFORMATIONMONITORINGDATAHUANGYaoying,HUANG
3、Guangming,WUZhongru,SHENZhenzhong(CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing,Jiangsu210098,China)Abstract:Basedonthedeformationmonitoringdata,three-stepmethodwhichisusedforinverseanalysisoftime-dependentparametersofdamandrockfoundationisdeveloped.Firstly,theelastic
4、moduliofdamandrockfoundationareinverselyanalyzedaccordingtothewaterpressurecomponentsapartfrommonitoringmodel.Then,theelasticmoduleoftheviscouselementisinverselyanalyzedusingthesteadyvalueoftime-dependentparametercomponents.Finally,theviscousparametersoftheviscouselementareinverselyanalyzedbased
5、ontheprocessvalueofthetime-dependentcomponents.TakingtheLongyangxiagravityarchdamasanexample,themethodisusedforinversionoftime-dependentparameterswhicharesensitive.Thereasonsthattheradialtime-dependentdeformationofthecrownbeambetweentheelevation2530and2610mistowardsupstreamareexplainedinmechanic
6、almechanism.Becausetheviscouscoefficientsofthedamandfoundationrockaregreat,thetime-dependentdeformationcausedbythedamself-weightleadstothedamupstreamdeformationstabilizeinalongtime;andthelong-termlowwaterleveloftheLongyangxiagravityarchdamisalsoafactor.Keywords:hydraulicengineering;deformationmo
7、nitoringdata;time-dependentparameters;optimizationandinversion;radialtime-dependentdisplacement工作状态,存在着随时间变化的不可逆变形,即时1引言效位移。时效位移是分析和评价大坝安全状况的重要依据。为了对大坝的安全状况进行监控,在大坝大量工程实践表明,大坝和坝基一般呈黏弹性和坝基内布置了大量的观测仪器,对其观测值一般收稿日期:2006–08–01;修回
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