2020 Volume 76 Issue 2 Pages 191-203
In this study, the decrease in the horizontal subgrade reaction coefficient of piles in liquefied volcanic ash ground was quantitatively evaluated by using a centrifugal model test with a liquefaction strength ratio of ground as a parameter. A relational equation which describes the decrease in the horizontal subgrade reaction coefficient of piles in liquefied ground was proposed and the related coefficients were evaluated. As a result, it was confirmed that the coefficient which presents the decrease level was correlated with the liquefaction strength ratio of ground, and the coefficient for volcanic ash ground was evaluated nearly twice as large as that for sandy ground. The above examination revealed that it would be generally sufficient to regard the decrease in the horizontal subgrade reaction coefficient of piles in liquefied volcanic ash ground as being about half that in sandy ground.
