Full-scale model test on pile foundation earthquake-resistance reinforcement method using ground solidification body

In the past large earthquakes, many pile foundations were suffered from destructed damage due to strong vibration and ground liquefaction. The necessity of earthquake resistant reinforcement to pile foundations has risen. However, applications of existing earthquake resistant reinforcement methods to pile foundations are limited because of various unfavorable construction conditions. The authors proposed a new method for the earthquake resistant reinforcement for pile foundations based on ground solidification techniques which is applicable to both new and existing pile foundations. The proposal method aims to increase the stiffness of the pile foundation by the effect of a two layered larmen structure by the reinforcement body made in the ground around piles, and was confirmed by model shaking table tests under 1g gravitational field and numerical simulation analyses. This paper will show a full-scale model test of the proposed method that was conducted to examine the construction performance and the quality of reinforcement body in the pile foundation. The full - scale test includes horizontal load tests, vibration tests, and excavation of the reinforcement body for observation. Based on the test results, applicability of the proposed reinforcement method for a real pile foundation was confirmed.