Spatio-temporal Tracking And Monitoring Method For Deformation Behaviour Of RCC Arch Dams

Due to the influence of long-term water environment,the structure and material properties of RCC dam in service are degraded in varying degrees,which has been objectively shown in the prototype observation data.Based on the positive and negative analysis of dam deformation monitoring data,and then effectively consider the impact of layer weakness on dam service performance is the key point of RCC dam safety monitoring.Therefore,taking an in-service RCC arch dam as the object,the methods of mathematics,mechanics,neural network and sparrow algorithm are comprehensively applied to carry out the research on the time-space tracking monitoring method of RCC arch dam deformation behavior from the aspects of deformation behavior statistical analysis,mechanical parameter inversion and time-space deformation monitoring.The main research contents are as follows:(1)Based on the prototype monitoring data,through the time-varying evolution analysis of the environmental quantity and deformation effect quantity of the RCC arch dam,the mathematical statistical model is used to quantify the change trend of the dam deformation effect quantity and the influence degree of its main influence factors on the total effect quantity,and then the evolution characteristics of the deformation behavior of the RCC arch dam are characterized.(2)In view of the complexity and low efficiency of the inversion of the main mechanical parameters of RCC dams,based on the layer by layer equivalent method,the uniform design method is used to efficiently generate the mechanical parameter samples,combined with the COMSOL finite element platform for forward analysis,and then the sparrow algorithm is used to optimize the BP neural network to establish the nonlinear functional relationship between the hydraulic pressure component and the mechanical parameters,The fast inversion method of the main mechanical parameters of RCC arch dam is explored.(3)Considering that the traditional water pressure season time(HST)model can only reflect the local displacement of the dam,and it is difficult to fully interpret the construction layer and its seepage characteristics,based on the analysis of HST model,the water pressure components of the body and layer are calculated and analyzed by introducing spatial coordinates and the coupling analysis model of seepage field and stress field,based on COMSOL finite element platform,and multiple linear regression is carried out,A hybrid model of time-space deformation monitoring for RCC arch dam considering the influence of bedding plane and seepage flow is established.