Estimation of the coefficient of earth pressure at rest K_0 in over consolidated clays

摘要

The estimate equation of the coefficient of earth pressure at rest, K_0-value, in normal consolidating process, what we call Jaky equation is very famous. Also in overconsolidating process the estimate equation for K_0-values have been proposed by Schmidt and Mayne. In these estimate equation parameter of et and m_r are calculated with a internal friction angle #phi#', the same with Jaky equation. In this study, authors reconsidered whether or not the estimations to be effective, and tried to derive a way to decide parameter of #alpha# and m_r without using #phi#'. The result of K_0 consolidation tests show, that these K_0-value equations are effective. Parameter #alpha# was derived using K_0-values in normal consolidating process and plastic index, parameter mr was derived using K_0-values in normal consolidating and swelling process and maximum overconsolidating ratio. And authors confirmed both parameter were effective.