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http://dx.doi.org/10.7843/kgs.2018.34.11.93

Numerical Analysis and Exploring of Ground Condition during Groundwater Drawdown Environment in Open-cut Type Excavation  

Han, Yushik (Geotechnical Engrg. Research Institute, Korean Geotechnical Society)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.11, 2018 , pp. 93-105 More about this Journal
Abstract
Precise investigation and interpretation of the ground subsidence risk factors needed to predict and evaluate the settlement problems of the surrounding ground due to the ground excavation. There are various geophysical exploration methods to investigate the ground subsidence risk factors. However, there are factors that influence the characteristics of the underground medium in these geophysical methods, and the actual soil contains complex factors affecting geophysical exploration. Therefore, it is necessary to analyze the effects on the geophysical methods based on the understanding of the geotechnical properties of soil. In this study, a test bed was constructed to consider various complicated factors in the complex ground and the ground behavior was analyzed by numerical analysis. In addition, we analyzed the limitations on investigating the ground subsidence risk factors through ground penetration radar (GPR) survey. As a result, ground subsidence of Open-cut Type Excavation is caused by various factors. Especially, in the case of soft ground condition, it was found that it was greatly influenced by the flow change of groundwater level. At the center frequency of GPR of 250 MHz, the attenuation of the electromagnetic wave is severely attenuated in the clay with high electrical conductivity, making it difficult to penetrate deeply into the ground (4 m below the surface). As the electromagnetic waves pass through the groundwater level below the groundwater, the attenuation of the electromagnetic waves becomes severe.
Keywords
Ground subsidence risk factors; Ground penetration radar (GPR); Open-cut type excavation; Groundwater flow change; Electromagnetic wave;
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Times Cited By KSCI : 3  (Citation Analysis)
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