| dc.description.abstract | Taiwan, which is an island that situated on Circum Pacific Seismic Belt and is extruded by Eurasian plate and Philippine sea plate. There are many faults in Taiwan because the plate movement occurs so frequently. When earthquake occurs, it would damage the crowded cities disastrously, especially in the area on the line of the trail of the faults. According to some earthquake recently, it is observed that the permanent displacement was due to dislocation of the fault and caused severe damage to the con-struction that sit on the trail of the fault. In addition, dislocation of the fault also let the pile foundations rotate, decline, and displace horizontally and vertically if they are set in the near-fault area. What’s more, it may lead to the bridge above near-fault area collapse. Therefore, it is worth discussing that the influences between the interaction of the pile founda-tion and the cover layer deformation caused by the dislocation of the reverse fault.
By using centrifuge to scale down the on-site group piles under 60g gravity field, the centrifugal model experiment is be conducted with four sets to analyze the dislocation of the reverse fault. To know how the pile behaves and deforms when reverse fault dislocation occurs, the test in-cludes one set is for free field and the other three sets are for group piles models on different positions. Furthermore, the experiment can also ob-serve the deformation characteristics near the ground and the develop-ment of the trail of the fault .The experimental results indicate: (1) The closer to the dislocation surface of the fault for the group piles founda-tions, the narrower the shear zone is. It causes the third trail of the fault when one of the group piles is on the upper plate and the other is on the lower plate. (2) If one of the group piles is on the upper plate and the other is on the lower plate when reverse fault dislocating, the bottom of the two piles on the upper plate would deform downwards to the lower plate. There is a settlement area near the pile cap on the upper plate, leading to larger rotation, horizontal displacement and vertical displace-ment. (3) It is observed that the trend of the changes of the bending moment in Test 1 and Test 2 are similar, and so do the changes of the axial force within Test 1 and Test 2. | en_US |