In the first part of this research, centrifuge model testing was used to investigate the relationship between the coefficient of lateral earth pressure at rest, K_0, and overconsolidation ratio, OCR, for clean sand for the whole loading-unloading-reloading cycle. Tactile pressure sensors were used to measure the change in K_0 in two saturated centrifuge models conducted on Ottawa sand A relationship was developed between the change in K_0 and OCR both for unloading and reloading conditions. In the second part of this research, the same tactile sensor was used to test the influence of extensive liquefaction on K_0 A centrifuge model was subjected to very strong shaking causing extensive liquefaction. Lateral earth pressure was measured before and after liquefaction. It was found that there is a significant reduction on K_0 due to extensive liquefaction which explains the increased vulnerability of sandy deposits after liquefaction, as observed by many researchers.
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