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Pullout Characteristics of Pressure Reinjection-Grouted Reinforcements in Decomposed Granite Soil  

Shim, Yong-Jin (주성건설 기술연구소)
Lee, Jong-Kyu (기술법인 다원)
Lee, Bong-Jik (한국교통대학교 토목공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.11, 2012 , pp. 61-68 More about this Journal
Abstract
Most widely methods for reinforcement of soil utilized in Korea are anchor method, soil nail method and micro pile method. These methods are classified by the intended use of the structure to be constructed, but the reinforcement of the ground is accomplished contains in common the process of grouting work after inserting the reinforcements. Domestically, gravity grouting has been used mostly so far, but there has always been the risk of insufficient restoration of the loose ground area from the drill holes because the grouting is conducted only by gravity. On the other hand, pressure reinjection grouting may enhance the grouting quality by solving the problem of the existing grouting method considerably since it additionally reinjects grouting through pre-installed tube a certain time after the first grouting. Accordingly, this study evaluated the pullout characteristics by the grouting methods by performing model test on decomposed granite soil, and investigated the support increasing characteristics of reinforcements depending on the curing time, reinjection pressure, and uplift force variation of the pressure reinjection grouting. The result of this research shows that the pressure reinjection grouting demonstrated 1.1~1.3 times of performance of the gravity grouting, and suggests some analysis on optimal water content, reinjection pressure and curing time of the pressure reinjection grouting.
Keywords
Decomposed granite soil; Gravity grouting; Pressure reinjection-grouting; Reinforcing effect; Curing time; Reinjection pressure;
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