Geomechanics and Engineering

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A study on data mining techniques for soil classification methods using cone penetration test results

  • Junghee Park (Department of Civil and Environmental Engineering, Incheon National University) ;
  • So-Hyun Cho (Department of Civil and Environmental Engineering, Kookmin University) ;
  • Jong-Sub Lee (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Hyun-Ki Kim (Department of Civil and Environmental Engineering, Kookmin University)
  • Received : 2022.12.20
  • Accepted : 2023.08.26
  • Published : 2023.10.10
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Abstract

Due to the nature of the conjunctive Cone Penetration Test(CPT), which does not verify the actual sample directly, geotechnical engineers commonly classify the underground geomaterials using CPT results with the classification diagrams proposed by various researchers. However, such classification diagrams may fail to reflect local geotechnical characteristics, potentially resulting in misclassification that does not align with the actual stratification in regions with strong local features. To address this, this paper presents an objective method for more accurate local CPT soil classification criteria, which utilizes C4.5 decision tree models trained with the CPT results from the clay-dominant southern coast of Korea and the sand-dominant region in South Carolina, USA. The results and analyses demonstrate that the C4.5 algorithm, in conjunction with oversampling, outlier removal, and pruning methods, can enhance and optimize the decision tree-based CPT soil classification model.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2C1088527).

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