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http://dx.doi.org/10.7843/kgs.2019.35.5.43

Improvement of Lift-off Tests via Field Evaluation of Residual Load in Ground Anchor  

Song, minkwon (Dept. of Civil & Environmental Engrg., Dankook Univ.)
Park, Seong-yeol (Dept. of Civil & Environmental Engrg., Dankook Univ.)
Lee, Sangrae (Korea Expressway Corporation Research Institute)
Cho, Wanjei (Dept. of Civil & Environmental Engrg., Dankook Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.35, no.5, 2019 , pp. 43-51 More about this Journal
Abstract
At present, the ground anchor method is commonly applied to securing the slope stability in Korea. The ground anchor is reported to decrease in tensile load due to aging and environmental influences with time such as corrosion, relaxation, creep and so on. In Korea, the lift-off test is performed for the periodic inspection or cases when the symptoms of deterioration on anchors and the residual tensile load of the anchors is checked. However, the current lift-off test standard (MOLIT, 2010) is not fully specified in details. In this study, the factors affecting the lift-off test were investigated based on the previous research and foreign standards and lift-off tests were performed with consideration for the loading and unloading cycle, load increment method, and tensioning tendon method. Based on the results, this paper proposes improved testing and evaluation procedures of the lift-off test considering the workability and time limits in the field.
Keywords
Ground anchor; Lift-off test; Residual tensile load; Residual displacement;
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  • Reference
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