| In this study、 static horizontal loading and dynamic vibration tests of single pile models were conducted using centrifuge model tests in a 50 G field for sandy soil ground、 as well as for clayey soil ground and volcanic ash ground、 which are widely distributed in Hokkaido、Japan. Accordingly、 basic earthquake-proof evaluation was conducted focusing on the pile ground spring constant. The p- method、 which focuses on relative displacement of piles and ground during earthquakes、 and the eigenvalue analysis method for calculation of the dynamic ground spring constant from the natural period of piles were used as analysis methods. These results showed that the dynamic coefficient of horizontal subgrade reaction of piles (Khe 、a main factor in pile foundation aseismic design methods) must be determined by comprehensive evaluation based on earthquake-proofness for each ground type 、 rather than by determining Khe from the relationship with the static coefficient of horizontal subgrade reaction、 Kh (Khe = Kh)、 or from shear elastic waves and other foundation strength constants. |
