基于原型监测的小湾特高拱坝首蓄期坝基变形特性分析  

Analysis on Foundation Deformation Properties of Xiaowan Ultra-high Arch Dam in Its First Impound Period based on Prototype Monitoring

作　　者：胡波[1,2] 刘观标[1] 吴中如[2] 

机构地区：[1]国网电力科学研究院/南京南瑞集团公司,江苏省南京市210003 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏省南京市210003

出　　处：《水电自动化与大坝监测》2012年第5期14-20,共7页HYDROPOWER AUTOMATION AND DAM MONITORING

基　　金：人力资源与社会保障部留学人员科技活动项目择优资助项目(2009003);江苏省自然科学基金资助项目(BK2009479);江苏省企业博士聚集计划(苏人才2011-33);江苏省博士后科研资助计划(1101049C)

摘　　要：基于原型监测和数值仿真试验成果,研究了小湾特高拱坝首蓄期坝基变形特性。通过集成和整合理论推导、相关分析、综合过程线对比分析、工程类比、数学模型分析等定性和定量分析手段,形成了一套变形分析和状态评估的方法。首先,运用实测值过程线分析、特征值统计、相关分析等定性半定量方法归纳和总结了坝基的变形特征,找出若干需要重点关注的"疑点"问题。然后,运用相关分析、数学模型分析、成因分析、数值仿真试验等定量方法进行物理解释和机理分析。最后,运用工程类比、模型监控等综合比较的方法,对坝基的变形状态进行评估。分析发现:首蓄期小湾坝基整体向下游和两岸山体方向变形,径向水平位移明显大于切向水平位移,河床坝段径向位移大于岸坡坝段径向位移,变形空间对称性总体较好;拱端切向变形较小,未见重大异常。河床坝基径向变形尽管较大,但变化符合力学规律,当前仍处于可控状态。综合分析认为,小湾特高拱坝经受了1 218m高库水位作用的考验,坝基变形规律总体正常。On the basis of prototype monitoring and numerical analysis,foundation deformation properties of Xiaowan ultra-high arch dam in its first impound period are studied.A set of methods for deformation analysis and condition assessment are established by integrating several qualitative and quantitative methods including theoretical derivation,correlation analysis,comprehensive hydrograph analysis,engineering analogy analysis,mathematical model analysis,etc.Firstly,several doubtful points are raised after preliminary analysis.Secondly,physical interpretation and mechanism analysis are conducted by quantitative analysis,including model analysis,numerical analysis,genetic analysis,and etc.Finally,the safety evaluation is made by comprehensive comparison analysis.The analysis results show that the foundation move to the downstream and the bank,the radial displacement is much greater than the tangential displacement,and the radial displacement on the river bed is much greater than that on the bank.So the deformation is compatible.Although the deformation on the riverbed is large,it accords with the general law.In conclusion,the foundation deformation is normal under the condition of 1 218 m water level.

关 键 词：特高拱坝 原型监测 数值仿真试验 坝基变形 综合对比 

分 类 号：TV543.5[水利工程—水利水电工程]