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http://dx.doi.org/10.7843/kgs.2015.31.10.5

Estimation of LRFD Resistance Bias Factors for Pullout Resistance of Soil-Nailing  

Son, Byeong-Doo (Graduate Student, Dept. of Civil Engrg., Chungnam Univ.)
Lim, Heui-Dae (Dept. of Civil Engrg., Chungnam Univ.)
Park, Joon-Mo (Dept. of Civil and Environmetal Engrg., Dongguk Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.31, no.10, 2015 , pp. 5-16 More about this Journal
Abstract
Considering the conversion of the Korea Construction Standards to Limit State Design (LSD), we analyzed the resistance bias factor for pullout resistance, as a part of the development of the Load and Resistance Factor Design (LRFD) for soil nailing; very few studies have been conducted on soil nailing. In order to reflect the local characteristics of soil nailing, such as the design and construction level, we collected statistics on pullout tests conducted on slopes and excavation construction sites around the country. In this study a database was built based on the geotechnical properties, soil nailing specifications, and pullout test results. The resistance bias factors are calculated to determine the resistance factor of the pullout resistance for gravity and pressurized grouting method, which are the most commonly used methods in Korea; moreover, we have relatively sufficient data on these methods. We found the resistance bias factors to be 1.144 and 1.325, which are relatively conservative values for predicting the actual ultimate pullout resistance. It showed that our designs are safer than those found in a research case in the United States (NCHRP Report); however, there was an uncertainty, $COV_R$, of 0.27-0.43 in the pullout resistance, which is relatively high. In addition, the pressurized grouting method has a greater margin of safety than the gravity grouting method, and the actual ultimate pullout resistance determined using the pressurized grouting method has low uncertainty.
Keywords
Soil nailing; Load and Resistance Factor Design; Pullout test; Ultimate pullout resistance; Resistance bias factor;
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