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Estimation of Ultimate Pullout Resistance of Soil-Nailing Using Nonlinear
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 Title & Authors
Estimation of Ultimate Pullout Resistance of Soil-Nailing Using Nonlinear
Park, Hyun-Gue; Lee, Kang-Il;
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In this study, we constructed a database by collecting field pullout test data of the soil nailing using pressurized grouting, and suggested a method to estimate the ultimate pullout resistance using nonlinear regression analysis to overcome the problems of ultimate pullout resistance estimation using graphical methods. The load-displacement curve estimated by nonlinear regression showed a very high correlation with the field pullout test data. Estimated ultimate pullout load by nonlinear regression method was average 29% higher than estimated ultimate pullout load using previous graphical method. A sigmoidal growth model was found to be the best-fitting nonlinear regression model against rapid pullout failure. Further, an asymptotic regression model was found to be the best fit against progressive nail pullout. The unit ultimate skin friction suggested in this research reflected in the domestic geotechnical characteristics and the specifications of the pressurized grouting method. This research is expected to contribute towards establishing an independent design standard for the soil nailing by providing solutions to the problems that occur when using design charts based on foreign research.
Soil nailing;Nonlinear regression;Pressurized soil nailing;Pullout force;Pullout test;
 Cited by
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