Abstract
The determination of the compressibility of clay soils is a major concern during the design and construction of geotechnical engineering projects. Directly acquiring precise values of compression indicators from consolidation tests are cumbersome and time-consuming. Based on experimental results from a series of index tests, this study presents a hybrid method that combines the XGBoost model with the Bayesian optimization strategy to show the potential for achieving higher accuracy in predicting the compressibility indicators of clay soils. The results show that the proposed XGBoost model selected by Bayesian optimization can predict compression indicators more accurately and reliably than the artificial neural network (ANN) and support vector machine (SVM) models. In addition to the lowest prediction error, the proposed XGBoost-based method enhances the interpretability by feature importance analysis, which indicates that the void ratio is the most important factor when predicting the compressibility of clay soils. This paper highlights the promising prospect of the XGBoost model with Bayesian optimization for predicting unknown property parameters of clay soils and its capability to benefit the entire life cycle of engineering projects.
摘要
在岩土工程的设计和实践中, 准确评估黏土的压缩性是一个至关重要问题。鉴于直接从固结试 验中获取压缩指标繁琐耗时, 提出了一种将XGBoost 模型与贝叶斯优化策略耦合的机器学**模型对黏 土的主要性能指标进行预测。结果表明, 贝叶斯优化的XGBoost 模型通过特征重要性分析增**了机器 学**模型的可解释性, 揭示出孔隙率是预测黏土压缩性能时最为关键的特征量;与传统的人工神经网 络(ANN)和支持向量机(SVM)模型相比, 贝叶斯优化的XGBoost 模型预测误差最小, 能实现对黏土压 缩指标更为准确和可靠的预测。
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The overarching research goals were developed by WU Hong-tao, ZHANG Zi-long, and Daniel DIAS. WU Hong-tao and ZHANG Zi-long conducted the literature review, wrote the draft, and completed the modeling processing. Daniel DIAS aided in editing and polishing the original draft. All authors replied to reviewers’ comments and revised the final version.
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WU Hong-tao, ZHANG Zi-long, and Daniel DIAS declare that they have no conflict of interest.
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Foundation item: Project(202206370130) supported by the China Scholarship Council; Project(2023ZZTS0034) supported by the Fundamental Research Funds for the Central Universities, China
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Wu, Ht., Zhang, Zl. & Dias, D. Prediction on compression indicators of clay soils using XGBoost with Bayesian optimization. J. Cent. South Univ. (2024). https://doi.org/10.1007/s11771-024-5681-9
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DOI: https://doi.org/10.1007/s11771-024-5681-9