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http://dx.doi.org/10.9711/KTAJ.2015.17.2.075

Application of non-destructive method for evaluation of soil nail length  

Kim, Ki-Hong (School of Civil, Environmental and Architectural Engineering, Korea University)
Kim, Nag-Young (Korea Expressway Corporation)
Lee, Jong-Sub (School of Civil, Environmental and Architectural Engineering, Korea University)
Yu, Jung-Doung (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.17, no.2, 2015 , pp. 75-90 More about this Journal
Abstract
As soil nails support a ground by the friction between nails and soils being reinforced, the length of soil nails is important factor for a ground stability. Thus, the soil nail length has to be accurately evaluated in order to secure a ground stability. The goal of this study is to suggest the applicability of the non-destructive method as the basic research for the evaluation of the soil nail length. First, the elastic and electromagnetic waves are adopted to select an applicable method for the soil nails connected by the coupler. Test results show that while the ultrasonic waves are not detected due to the coupler, the electromagnetic waves are free for the influence of the coupler. Second, electromagnetic waves are measured for combined soil nails with the length of 1 m~15 m for the investigation of the characteristics of electromagnetic waves. The travel time of the electromagnetic wave increases with an increase in the soil nail length. In addition, the ground cable is used to apply the electromagnetic waves to pre-installed soil nails. Test results show that the travel time of the electromagnetic wave by using the ground cable increases with an increase in soil nail length. This study demonstrates that the electromagnetic wave may be a promising method for the evaluation of the soil nail length.
Keywords
Electromagnetic waves; Non-destructive testing; Soil nail; Time domain reflectometry; Ultrasonic waves;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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