Optimization inversion of concrete dam's time-dependent parameters based on deformation monitoring data

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 2530 and 2610 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.