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,从力学机制上解析龙羊峡重力拱坝拱冠梁在2 530～2 610 m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。
Based on the deformation monitoring data,three-step method which is used for inverse analysis of time-dependent parameters of dam and rock foundation is developed.Firstly,the elastic moduli of dam and rock foundation are inversely analyzed according to the water pressure components apart from monitoring model.Then,the elastic module of the viscous element is inversely analyzed using the steady value of time-dependent parameter components.Finally,the viscous parameters of the viscous element are inversely analyzed based on the process value of the time-dependent components.Taking the Longyangxia gravity arch dam as an example,the method is used for inversion of time-dependent parameters which are sensitive.The reasons that the radial time-dependent deformation of the crown beam between the elevation 2 530 and 2 610 m is towards upstream are explained in mechanical mechanism.Because the viscous coefficients of the dam and foundation rock are great,the time-dependent deformation caused by the dam self-weight leads to the dam upstream deformation stabilize in a long time;and the long-term low water level of the Longyangxia gravity arch dam is also a factor.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第A01期2941-2945,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2002CB412707)
国家自然科学基金重点项目(50539010)
国家自然科学基金资助项目(50579010)
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
hydraulic engineering
deformation monitoring data
time-dependent parameters
optimization and inversion
radial time-dependent displacement
