Overconsolidation ratio(OCR)is an important geotechnical parameter that plays a crucial role in the analysis and design of foundations and structures on clay deposits.In this study,five machine learning(ML)algorithms,...Overconsolidation ratio(OCR)is an important geotechnical parameter that plays a crucial role in the analysis and design of foundations and structures on clay deposits.In this study,five machine learning(ML)algorithms,including gradient boosting machine(GBM),random forest(RF),artificial neural network(ANN),support vector machine(SVM),and eXtreme gradient boosting(XGB)were developed to estimate the OCR of clays based on the piezocone penetration test data.The‘GridSearchCV’function from the Scikit-learn package was employed to perform hyper-parameter tuning and k-fold cross-validation,ensuring the best possible model performance.Vertical total stress(σ_(v0)),hydrostatic pore water pressure(u_(0)),corrected cone resistance(q_(t)),pore pressure elements at the cone tip(u_(1)),and above the cone base(u_(2)),along with the type of clay(intact or fissured)were selected as the main features of input data.Sensitivity analysis revealed that qt was the most influential parameter for RF,GBM,XGB,and SVM predictions,while all inputs affected the ANN model.It was found that the SVM model delivered the lowest accuracy in predicting OCR.In contrast,the XGB model showed the best performance,while the remaining models achieved reliable results,each with a coefficient of determination of 0.90 or higher.展开更多
文摘Overconsolidation ratio(OCR)is an important geotechnical parameter that plays a crucial role in the analysis and design of foundations and structures on clay deposits.In this study,five machine learning(ML)algorithms,including gradient boosting machine(GBM),random forest(RF),artificial neural network(ANN),support vector machine(SVM),and eXtreme gradient boosting(XGB)were developed to estimate the OCR of clays based on the piezocone penetration test data.The‘GridSearchCV’function from the Scikit-learn package was employed to perform hyper-parameter tuning and k-fold cross-validation,ensuring the best possible model performance.Vertical total stress(σ_(v0)),hydrostatic pore water pressure(u_(0)),corrected cone resistance(q_(t)),pore pressure elements at the cone tip(u_(1)),and above the cone base(u_(2)),along with the type of clay(intact or fissured)were selected as the main features of input data.Sensitivity analysis revealed that qt was the most influential parameter for RF,GBM,XGB,and SVM predictions,while all inputs affected the ANN model.It was found that the SVM model delivered the lowest accuracy in predicting OCR.In contrast,the XGB model showed the best performance,while the remaining models achieved reliable results,each with a coefficient of determination of 0.90 or higher.
