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A Study on Measuring the Coefficient of Earth Pressure at Rest II  

SONG MU-HYO (Division of Civil and Urban Engineering, Dong Eui University)
Publication Information
Journal of Ocean Engineering and Technology / v.18, no.6, 2004 , pp. 58-69 More about this Journal
Abstract
In order to investigate the characteristics of the lateral earth pressure at rest, under hysteretic $K_o-loading/unloading$ conditions, seven types of multi-cyclic models have been studied, using dry sand. For this study, the new type of $K_o-oedometer$ apparatus was developed, and the horizontal pressure was accurately measured. The multi-cyclic models consist of primarily 3 cases: (i) $K_o-test$ under the same loading / unloading condition, (ii) multi-cyclic loading / unloading $K_o-test$ exceeding the maximum pre-vertical stress, and (iii) multi-cyclic loading / unloading $K_o-test$ within the maximum pre-vertical stress. Results fromthe multi-cyclic model indicated that a single-cyclic model could be extended if the exponents for the unloading condition $(\alpha\;and\;\alpha^*)$ and the reloading coefficients $(m_r,\;and\;m_r^{\ast})$ were primarily dependent upon the type of model, number of cycles, and the relative density.
Keywords
Lateral Earth Pressure at Rest; Loading/Unloading Condition; Mnulti-Cyclic Models; Ko-Oedometer Apparatus; Relative Density;
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