Analysis and monitoring of deformation of ultra-high arch dams

Abstract

The engineering technology and construction challenges of the 305-meter-level ultra-large hydropower station are beyond imagination, with many technical indicators surpassing current regulatory requirements. Mastering the deformation laws and formulating deformation monitoring indicators are extremely complex task. Firstly, the significant deformation characteristics of the active dam body are analyzed and summarized from multiple perspectives based on 1∶1 prototype test parameters, providing feedback on the actual service performance of the dam body and exploring external influencing factors and laws. Secondly, by integrating load sets and load effect sets, various influencing factors are comprehensively determined through deterministic functions and physical inference method. Based on measured data, the coefficients of each factor in the model are determined, allowing the calculation of the load effect set for a certain set of load sets. Subsequently, a deformation monitoring statistical model for super high arch dams is established to determine the working status of buildings and monitor them. Through deformation prediction analysis of typical measurement points, the result are compared and analyzed with other method, leading to the derivation of deformation monitoring indicators and optimal formulation method for super high arch dams. Thirdly, a three-dimensional nonlinear finite element model of the dam body is established, and an incremental step difference algorithm is proposed, considering the self-weight of the dam body and external water load, which accurately simulated the actual deformation behavior of the arch dam. The research result provide a strong reference for the exploration and analysis of similar projects in the future.

Keywords

305 m level / ultra large hydropower stations / arch dam deformation / deformation monitoring