1-G 진동대 실험을 이용한 기존 구조물과 시트파일의 이격거리에 따른 액상화 피해 방지 연구

다국어 초록 (Multilingual Abstract)

Earthquakes occurring around the world can cause significant casualties and material damage. In particular, liquefaction caused by earthquakes causes significant damage to structures. Accordingly, various methods for reducing liquefaction damage are being researched and developed in many countries, including the United States, Japan, and Korea. In this study, a study was conducted by setting a certain gap between the sheet pile and the structure to determine the effect of the gap between the structure and the sheet pile on reducing the liquefaction damage of the structure during an earthquake. A 1-G shaking table tests was performed and a model ground was created using the Jumunjin standard sand. The model structure was manufactured by applying Iai's similarity law, and the input wave was a sine wave with an acceleration of 0.6 g and a frequency of 10 Hz. And in order to find out the correlation between the Embedded depth ratio (denoted as EDR) of the sheet pile and the gap between the sheet pile and the structure, an experiment was conducted by subdividing the EDR of the sheet pile. As a result of the study, when the ground is reinforced by applying the sheet pile method separated from the existing structure, the structure settlement is reduced by approximately 67% compared to when the ground is not reinforced, and EDR with the best reinforcement effect was 0.85 and the minimum settlement is 56 mm. In addition, the maximum pore water pressure at EDR 0.85 is reduced by approximately 70% to 0.94 kPa, which confirmed that the pore water pressure dissipation of the ground reinforced with sheet piles tended to be delayed. As a result, the relationship between EDR and structural settlement is graphically diagrammed. The results of this study are expected to serve as basic data for developing a sheet pile method that applies separation distance conditions from existing structures.