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Computers and Concrete Volume 34, Number 4, October 2024 , pages 477-487 DOI: https://doi.org/10.12989/cac.2024.34.4.477 |
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In-situ stresses ring hole measurement of concrete optimized based on finite element and GBDT algorithm |
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Chen Guo, Zheng Yang, Yanchao Yue, Wenxiao Li and Hantao Wu
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| Abstract | ||
| The in-situ stresses of concrete are an essential index for assessing the safety performance of concrete structures. Conventional methods for pore pressure release often face challenges in selecting drilling ring parameters, uncontrollable stress release, and unstable detection accuracy. In this paper, the parameters affecting the results of the concrete ring hole stress release method are cross-combined, and finite elements are used to simulate the combined parameters and extract the stress release values to establish a training set. The GridSearchCV function is utilized to determine the optimal hyperparameters. The mean absolute error (MAE), root mean square error (RMSE), and coefficient of determination (R2) are used as evaluation indexes to train the gradient boosting decision tree (GBDT) algorithm, and the other three common algorithms are compared. The RMSE of the GBDT algorithm for the test set is 4.499, and the R2 of the GBDT algorithm for the test set is 0.962, which is 9.66% higher than the R2 of the best-performing comparison algorithm. The model generated by the GBDT algorithm can accurately calculate the concrete in-situ stresses based on the drilling ring parameters and the corresponding stress release values and has a high accuracy and generalization ability. | ||
| Key Words | ||
| finite element; GBDT algorithm; grid search; ring hole method; stress release | ||
| Address | ||
| School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710000, China | ||