An investigation on interaction between liquefied soil and pile foundation during earthquake

关于钢桩式桥墩的破坏记录很少。在以前的地震中。然而，在1995年的Hyogoken-Nambu地震中，位于重力式沉箱前的几个桥墩遭到破坏。现场桩的破坏表明，地面的侧向流动可能会加速桥墩的破坏。在本研究中，首先进行了离心机试验，以模拟1995年Hyogoken-Nambu地震中受损的钢桩式桥墩的动力行为和破坏情况。并进行了不同地基条件下的试验，探讨了抛石丘下砂层液化对地面侧向流动的影响，以及重力式沉箱与桥墩的接近板对两种结构动力相互作用的影响。

There had been very few records on damages of steel pile type piers. in previous earthquakes. However, several piers located in front of gravity caissons were damaged during the 1995 Hyogoken-Nambu Earthquake. Damage of piles at the site suggested that the lateral flow of the ground might accelerate the failure of the pier. In this study, centrifuge tests were firstly carried out to simulate dynamic behavior and failure of a steel pile type pier damaged in 1995 Hyogoken-Nambu Earthquake. And also some tests with different ground conditions were conducted to discuss the effects of liquefaction of the sand layer under the rubble mound on the lateral flow of the ground and the effect of the approaching plate connecting gravity caisson to ther pier on the dynamic interaction between the two structures.