Geomechanics and Engineering

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Correlations between variables related to slope during rainfall and factor of safety and displacement by coupling analysis

  • Jeong-Yeon Yu (Department of Civil Engineering, Inha University) ;
  • Jong-Won Woo (Department of Civil Engineering, Inha University) ;
  • Kyung-Nam Kang (Department of Civil Engineering, Inha University) ;
  • Ki-Il Song (Department of Civil Engineering, Inha University)
  • Received : 2022.11.25
  • Accepted : 2023.03.07
  • Published : 2023.04.25
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Abstract

This study aims to establish the correlations between variables related to a slope during rainfall and factor of safety (FOS) and displacement using a coupling analysis method that is designed to consider both in rainfall conditions. With the recent development of measurement technologies, the approach of using the measurement data in the field has become easier. Particularly, they have been obtained in tests to determine the real-time safety and movement of a slope; however, a specific method has not been finalized. In addition, collected measurement data for recognizing the FOS and displacement in real-time with a specific relevance is difficult, and risks of uncertainty, such as in soil parameters and time, exist. In this study, the correlations between various slope-related variables (i.e., rainfall intensity, rainfall duration, angle of the slope, and mechanical properties including strength parameters of selected three types of soil; loamy sand, silt loam, sand) and the FOS and displacement are analyzed in order of seepage analysis, slope stability analysis and slope displacement analysis. Moreover, the methodology of coupling analysis is verified and a fundamental understanding of the factors that need to be considered in real-time observations is gained. The results show that the contributions of the abovementioned variables vary according to the soil type. Thus, the tendency of the displacement also differs by the soil type and variables but not same tendency with FOS. The friction angle and cohesion are negative while the rainfall duration and rainfall intensity are positive with the displacement. This suggests that understanding their correlations is necessary to determine the safety of a slope in real-time using displacement data. Additionally, databases considering rainfall conditions and a wide range of soil characteristics, including hydraulic and mechanical parameters, should be accumulated.

Keywords

Acknowledgement

This study was supported by the "Ministry of Interior and Safety" R&D program (20018265).

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