[논문]3D 프린터를 이용한 선단 모양 변화에 따른 타입말뚝 거동 연구

김도현

doi:10.7843/kgs.2023.39.1.27

3D 프린터를 이용한 선단 모양 변화에 따른 타입말뚝 거동 연구
Study on the Effect of Pile Tip Shape on Driven Pile Behavior Using 3D Printers 원문보기

韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.39 no.1, 2023년, pp.27 - 38

김도현 (국립한밭대학교 건설환경공학과)

초록
AI-Helper

본 연구에서는 3D 프린팅 기술을 활용하여 타입말뚝 선단의 모양에 따른 관입성 분석을 현장 축소모형시험을 통해 관찰하고, 대변형 수치해석을 통해 타입 중 말뚝 선단에 집중되는 최대응력의 변화를 확인하였다. 3D 프린터를 통하여 다양한 직경, 각도 그리고 모양의 말뚝 선단 모형을 제작하였고, 이를 현장 축소모형시험에 활용하였다. 이를 통해, 말뚝 선단 조건에 따른 말뚝의 침하량의 변화를 관찰하였다. 더 나아가, 대변형 수치해석 기법을 적용하여 다양한 말뚝 선단 조건에 따른 타입 중 말뚝 선단부의 최대응력의 변화와 최대응력 작용 위치 또한 확인하였다. 현장 축소모형시험과 대변형 수치해석의 결과 분석을 토대로 말뚝 선단 조건의 변화를 통해 타입말뚝의 관입성을 향상 시킬 수 있으며 선단부에 집중되는 최대응력 또한 완화 시켜 말뚝 시공 중 말뚝 손상을 방지할 수 있을 것으로 결론지을 수 있었다.

Abstract ▼ AI-Helper

In this study, the impact of pile tip geometry, including shape, size, and angle, on the drivability and stress concentration during pile driving was investigated using 3D printing technology and finite element numerical analysis. A series of field loading tests were conducted on a test pile with various pile tip conditions, including width, angle, and shape. The changes in settlement were quantified as a ratio to the settlement of a conventional pile tip case and large deformation finite element analysis was used to investigate the maximum stress on a pile tip and the location of possible damage during pile driving. The results showed that by modifying the shape, size, and angle of the pile tip, the drivability of the pile could be improved and the maximum stress concentration around the pile tip could be significantly reduced, thereby ensuring the structural integrity of the pile during pile driving.

주제어

표/그림 (13)

그림 Fig. 1. Schematic of driven pile
그림 Fig. 2. Schematic of 3D printed pile tips (half section) (diameter = 0, 2, 4, 6, 8cm)
그림 Fig. 3. Preparation of the model scale loading test
그림 Fig. 4. Field test results (settlement)
표 Table 1. SPT N-value at pile tip
표 Table 2. Test results (%) (settlement, normalized with measurements from default pile tip)
그림 Fig. 5. FE modelling
표 Table 3. Soil properties for FE numerical analysis (Kim et al., 2020; Kim, 2021)
그림 Fig. 6. Flow chart of the automated remeshing process
그림 Fig. 7. Numerical model verification
그림 Fig. 8. Location of the maximum stress concentration
그림 Fig. 9. Numerical results (maximum stress)
표 Table 4. Numerical results (%) (maximum stress, normalized with results from default pile tip)

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