群杭基礎の振動特性に関する研究 : 杭基礎試験体の強制加振実験と解析的検討

抄録

The forced vibration tests in horizontal and vertical directions are performed on pile foundation models. The purposes of these tests are to obtain the dynamic characteristics of pile groups foundation and to develop the dynamic analysis method for pile groups foundation. In these tests, single pile model and pile groups model are examined. As for the pile groups model, the effect of grouting between the ground surface and the concrete block bottom is found not to be negligible, and the embedment effect of the block is verified. Then, vibration mode of pile is examined. Comparing the single pile and the group piles, it is recognized that the group effect of piles appear remarkably in the real parts of the impedance functions, whereas in the imaginary parts, these effects can not be recognized. The correlation analyses are performed between test results and analyses, and it is found that the test results before backfilling are well simulated based on the 3-D thin layer method, and that the results after backfilling are proved also well simulated based on side spring of the block with the above mentioned method.