Inversion and Stress Analysis of Mechanical Parameters of Arch Dam of Dongjiang River

Abstract

The structure of arch dam of Dongjiang River is more complex. In addition to the diversion steel pipeline of dam body, gate pier and other main parts close to the arch dam, the downstream face of the dam body is also built with anchored pier and outer wrapper concrete of diversion steel pipeline. This paper uses the combination method of uniform design and improved MMAS (maximum and minimum ant colony system) algorithm and BP neural network for the finite element back analysis of key mechanical parameters of the arch dam, and carries out comparative analysis of the dam stress through further calculation and combined with previous research, and draws the following conclusions: (1) The improved MMAS-BP algorithm improves learning, generalization capability and global and local optimization capability of BP algorithm, with a strong robustness. (2) The inversion results of materials partition for special parts of the dam body have a better compliance with the measured value, and back analysis results are reasonable and effective. (3) The back analysis parameters are used for the finite element calculation and the result shows that, compared with the results of the multi-arch and multi- beam method used in the design and review stages, the overall rules of the finite element calculation results basically remain the same, the arch crown is relatively safe, and the abutment is somewhat dangerous.