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Unformatted text preview: if p.' cr', o Normally consolidated (NC) H p. c-,. o Under-consolidated (UC) I' ,., L ,,-; o Over-consolidation Ratio Oc.R.-fl' /(J~; Reasons for pc > a'o : o overburden/load removal including erosion, dune movement, structure removal, melted~ I glaciers, etc. (this is the strict definition) I rise in groundwater levels which lowers effective stress o past desiccation induced capillary forces o seepage forces o tectonic forces, earth movements-Many researchers now believe that truly NC soils are rare, lowest natural OCR = 1.1 UC soils are infrequent and may indicate active consolidation (and lots of settlement!)...
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- Fall '08