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Zhang, Wengang; Wu, Chongzhi; Zhong, Haiyi; Li, Yongqin; Wang, Lin
Di xue qian yuan., January 2021, 2021-01-00, 2021, 2021-01-01, Volume: 12, Issue: 1Journal Article
Accurate assessment of undrained shear strength (USS) for soft sensitive clays is a great concern in geotechnical engineering practice. This study applies novel data-driven extreme gradient boosting (XGBoost) and random forest (RF) ensemble learning methods for capturing the relationships between the USS and various basic soil parameters. Based on the soil data sets from TC304 database, a general approach is developed to predict the USS of soft clays using the two machine learning methods above, where five feature variables including the preconsolidation stress (PS), vertical effective stress (VES), liquid limit (LL), plastic limit (PL) and natural water content (W) are adopted. To reduce the dependence on the rule of thumb and inefficient brute-force search, the Bayesian optimization method is applied to determine the appropriate model hyper-parameters of both XGBoost and RF. The developed models are comprehensively compared with three comparison machine learning methods and two transformation models with respect to predictive accuracy and robustness under 5-fold cross-validation (CV). It is shown that XGBoost-based and RF-based methods outperform these approaches. Besides, the XGBoost-based model provides feature importance ranks, which makes it a promising tool in the prediction of geotechnical parameters and enhances the interpretability of model. Display omitted •XGBoost and RF-based ELMs for predicting the undrained shear strength of soft clays.•Bayesian hyper-parameter optimization for determination of the hyper-parameters.•ELMs performance and transformation model comparison.•Feature relative importance ranked by the proposed XGBoost-based model.
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