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2025 Vol.26, Issue 3 Preview Page
A Study on the Prevention of Liquefaction Damage According to the Separation Distance between the Existing Structure and the Sheet Pile Using the 1-G Shaking Table Tests

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

Sanghoon Kim1
,
Jongchan Yoon2
,
Suwon Son3
,
Junseong Moon4
,
Jinman Kim5*
김 상훈1
,
윤 종찬2
,
손 수원3
,
문 준성4
,
김 진만5*
1Ph. D Candidate, Department of Civil and Environment Engineering, Pusan National University
2Post Doc., Department of Civil and Environment Engineering, Pusan National University
3Professor, Department of Architectural and Civil Engineering, Kyungil University
4Graduate student, Department of Civil and Environment Engineering, Pusan National University
5Professor, Department of Civil and Environment Engineering, Pusan National University
*Corresponding Author
1 March 2025. pp. 17-27
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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.

Keywords
Liquefaction
Liquefaction prevention method
Separation distance
1-G Shaking table tests
Sheet pile method

전 세계적으로 발생하고 있는 지진은 많은 인명 피해와 물적 피해를 야기할 수 있다. 특히, 지진에 의해 발생하는 액상화 현상은 구조물에 큰 피해를 발생시킨다. 이에 미국과 일본, 그리고 한국을 포함한 여러 나라에서 액상화 피해 저감을 위한 공법이 다양하게 연구 및 개발되고 있다. 본 연구에서는 지진 시, 구조물과 시트파일 사이의 간격이 구조물의 액상화 피해 저감에 미치는 효과를 확인하기 위해 시트파일과 구조물 사이에 일정한 간격을 설정하여 연구를 수행하였다. 1-G 진동대 실험을 수행하였으며, 주문진 표준사를 이용하여 모형지반을 조성하였다. Iai의 상사법칙을 적용하여 모형 구조물을 제작하였고, 입력파는 가속도 0.6g과 주파수 10Hz의 정현파를 적용하였다. 그리고 시트파일의 근입비와 시트파일과 구조물 사이 간격 간의 상관관계를 파악하기 위해 시트파일의 근입비를 세분화하여 실험을 수행하였다. 연구 결과, 기존 구조물에서 이격한 시트파일 공법을 적용하여 지반을 보강하였을 경우의 구조물 침하가 지반 보강을 하지 않았을 경우 보다 약 67% 감소하였고, 보강효과가 가장 좋은 Hsp/Hsl은 0.85이며, 최소 침하량은 56mm이다. 또한, 근입비 0.85에서 최대간극수압은 약 70% 감소한 0.94kPa로써 이는 시트파일로 보강한 지반의 간극수압 소산이 지연되는 경향임을 확인할 수 있었다. 이러한 결과로 근입비에 따른 구조물 침하와의 관계를 그래프로 도식화하였다. 본 연구 결과는 기존 구조물로부터 이격거리 조건을 적용한 시트파일 공법을 개발하는데 기초자료가 될 수 있을 것으로 기대한다.

키워드
액상화
액상화 방지공법
이격거리
1-G 진동대 실험
시트파일 공법
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Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 26
  • No :3
  • Pages :17-27
  • Received Date : 2024-02-05
  • Revised Date : 2025-02-06
  • Accepted Date : 2025-02-19
  • DOI :https://doi.org/10.14481/jkges.2025.26.3.17
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