基于原型监测和数值仿真试验的小湾特高拱坝坝基岩体变形特性分析  

Foundation Rockmass Deformation Research on Xiaowan Ultra-high Arch Dam Based on Prototype Monitoring and Numerical Testing

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》2013年第1期32-37,42,共7页HYDROPOWER AUTOMATION AND DAM MONITORING

基　　金：国家自然科学基金资助项目(51139001);国家人力资源与社会保障部留学人员科技活动择优资助项目(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：针对小湾特高拱坝施工期及首次蓄水期坝基岩体变形的"疑点"和"焦点"问题,通过集成和整合综合过程线对比分析、数学建模分析、数值仿真试验、理论演绎、数理统计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。分析发现,坝踵基岩水平位移并非库水位的单调函数,存在拐点水位,主要由于库水的重力和推力两种不同作用效应引起。坝踵基岩垂直变形发展可分为卸荷回弹、压缩和抬升三个阶段,坝趾可分为卸荷回弹、自重压缩和坝体转动压缩三个阶段。水压是影响坝基岩体变形的主要因素,变形时效分量逐渐趋于收敛。综合分析认为,大坝经受了1 218m高库水位作用的考验,坝基岩体变形发展基本能与施工及蓄水过程相对应,变形规律总体正常,不会对大坝安全造成重大威胁。The prototype monitoring and numerical analysis are integrated to study the foundation rockmass deformation properties of Xiaowan dam.A set of method system is established to research the problem,including comprehensive hydrograph analysis,model analysis,numerical testing,derivation,mathematical statistics,and etc.The analysis results show that,the relationship between deformation in dam heels and water level is not monotone function.Including water push,the water gravity is another important effect from reservoir water to the dam.There are three typical stages in the rockmass vertical deformation hydrograph at dam heels,namely unloading rebound,compressive and lifting.There are three typical stages of the rockmass vertical deformation hydrograph at dam toes,namely unloading rebound,gravity effect compressive and rotate compressive.The water pressure is the main factor influencing the deformation of rockmass in dam foundation.And the time-effect component tends to convergent.In conclusion,the foundation rockmass deformation is normal on the condition of 1218m water level.

关 键 词：特高拱坝 坝基 原型监测 数值仿真试验 变形 

分 类 号：TV223.1[水利工程—水工结构工程] TV698.1