Sensitivity analysis and instability study of mechanical parameters of deterioration layer of RCC dam

Aiming at the characteristics of multi-layer structure of roller compacted concrete (RCC) dam and the complicated combination of layers, the three-dimensional calculation of the structure of RCC dam adopts the multi-layer elastoplastic constitutive model. The influence of various parameters of RCC dam deterioration on the strength of the dam body was analyzed in detail. The Latin hypercube algorithm was used to randomly sample each material parameter. The sensitivity of the degraded interlayer parameters was studied based on the Spearman rank correlation coefficient. To solve the simulation The non-stationary randomness of the degradation process, the introduction of the impact factor attenuation function to smooth the degradation, the establishment of a time-varying model of material parameter degradation, and on the basis of the strength reduction coefficient method, the degradation driving level of the RCC dam is calculated. Through the research results, it is possible to focus on monitoring the relevant aspects of the dam during operation, take relevant measures in real time, and feedback on the design and construction plan, which is of great significance for the research on the stability of the RCC dam against sliding.