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http://dx.doi.org/10.7843/kgs.2011.27.10.013

A Study for Predicting Adfreeze Bond Strength from Shear Strength of Frozen Soil  

Choi, Chang-Ho (Korea Institute of Construction Technology/Associate, University of Science and Technology)
Ko, Sung-Gyu (University of Science and Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.27, no.10, 2011 , pp. 13-23 More about this Journal
Abstract
Bearing capacity of pile foundations in cold region is dominated by adfreeze bond strength between surrounding soil and pile perimeter. It denotes that adfreeze bond strength is the most important design parameter for foundations in cold region. Adfreeze bond strength is affected by various factors like 'soil type', 'frozen temperature', 'normal stress acting on soil/pile interface', 'loading rate', 'roughness of pile surface', etc. Several methods have already been proposed to estimate adfreeze bond strength during past 50 years. However, most methods have not considered the effect of normal stress for adfreeze bond strength. In this study, both freezing temperature and normal stress have been controlled as primary factors affecting adfreeze bond strength. A direct shear box was used to measure adfreeze bond strength between sand and aluminum under different temperature conditions. Based on the test results, the relation between shear strength of frozen sand and adfreeze bond strength have been investigated. The test results showed that both of shear strength and adfreeze bond strength tend to increase with decreasing frozen temperature or increasing confining pressure. The ratio of shear strength and adfreeze bond strength, expressed as $r_s$, decreased initially frozen section but increased at much lower frozen temperature and there were uniform intervals under the different normal stress conditions. A method for predicting adfreeze bond strength using $r_s$ has finally been proposed in this study.
Keywords
Adfreeze bond strength; Cold region; Direct shear test; Frozen sand; Pile foundation;
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