水平力を受ける2本群杭の相互作用に関する研究

Abstract

In order to estimate the displacement of laterally loaded pile groups, it is very important to evaluate the interaction between group piles. In this study, the interaction between group piles is investigated by the centrifuge model tests (40g). We place focus on the simplest case, that is, the interaction between two piles. The model piles have the same bending rigidity as the actual steel pile, 60cm in diameter. Air-dried Toyoura standard sand is used for the ground material, and its relative density is more than 90%. The spacing between pile centers and the angle from the loading direction are the experimental parameters. From the test results, it is found that the load distribution decreases for the pile positioned in back, since the interaction between each pile are not equal due to the difference in subgrade reaction in front of the pile. Secondly, three-dimensional elast-plastic FEM (GPILE-3D) is improved and analyzed above centrifuge model tests to check the validity of this analysis.