Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Prevention of Liquefaction Damage of the Sheet File Method Applicable to the Foundation of Existing Structures Using the 1-G Shaking Table Experiment

1-G 진동대 실험을 이용한 기존 구조물 기초에 적용 가능한 시트파일 공법의 액상화 피해 방지에 관한 연구

  • Jongchan Yoon (Department of Civil and Environment Engineering, Pusan National University) ;
  • Suwon Son (Department of Architectural and Civil Engineering, Kyungil University) ;
  • Junhyeok Park (Department of Civil and Environment Engineering, Pusan National University) ;
  • Junseong Moon (Department of Civil and Environment Engineering, Pusan National University) ;
  • Jinman Kim (Department of Civil and Environment Engineering, Pusan National University)
  • Received : 2023.06.09
  • Accepted : 2023.06.28
  • Published : 2023.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, earthquakes have occurred frequently in worldwide. These earthquakes cause various forms of natural and physical damage. In particular, liquefaction in which the ground shows liquid-like behavior causes great damage to the structure. Accordingly, various liquefaction damage reduction methods are being studied and developed. Therefore, in this study, a method of reducing liquefaction damage in the event of an earthquake applicable to existing structures was studied using the sheet pile method. The 1-G Shaking table test was performed and the ground was constructed with Jumunjin standard sand. A two-story model structure was produced by applying the similitude law, and the input wave applied a sine wave with an acceleration level of 0.6 g and a frequency of 10 Hz. The effect of reducing structure damage according to various embedded depth ratio was analyzed. As a result of the study, the structure settlement when the ground is reinforced by applying the sheet pile method is decreased by about 71% compared to when the ground is not reinforced, and the EDR with minimum settlement is "1". In addition, as the embedded depth ratio is increased, the calculation of the pore water pressure in the ground tends to be delayed due to the sheet pile. Based on these results, the relationship with structural settlement according to the embedded depth ratio is proposed as a relational equation with the graph. The results of this study are expected to be used as basic data in developing sheet pile methods applicable to existing structures in the future.

최근 국내·외에서 지진이 자주 발생하고 있다. 이러한 지진은 다양한 형태의 자연적 피해와 물리적 피해의 원인이 된다. 특히, 지반이 액체와 같은 거동을 보이는 액상화는 구조물에 큰 피해를 발생시킨다. 이에 다양한 액상화 피해 저감 공법들이 연구 및 개발되고 있다. 이에 본 연구에서는 시트파일 공법을 이용하여 기존 구조물에 적용 가능한 지진 시 액상화 피해 저감 공법에 대해 연구하였다. 1-G 진동대 실험을 수행하였고 주문진 표준사로 지반을 조성하였다. 상사 법칙을 적용하여 2층 규모의 모형 구조물을 제작하였고, 입력파는 가속도 수준 0.6g와 주파수 10Hz의 정현파를 적용하였다. 다양한 근입비에 따른 구조물 피해 저감 효과를 분석하였다. 연구 결과, 시트파일 공법을 적용하여 지반을 보강하였을 때의 구조물 침하가 지반 보강을 하지 않았을 때보다 약 71% 정도 감소하였으며, 최소 침하량을 보인 근입비는 "1"이었다. 그리고 근입비가 증가할수록 시트파일로 인해 지반 내 간극수압의 소산이 지연되는 경향을 보였다. 이러한 결과를 바탕으로 근입비에 따른 구조물 침하와의 관계를 그래프와 관계식으로 제안하였다. 본 연구 결과는 향후 기존 구조물에 적용 가능한 시트파일 공법을 개발하는데 있어 기초자료로 사용될 수 있을 것으로 기대된다.

Keywords

Acknowledgement

본 연구는 부산대학교 기본연구지원사업(2년) 및 한국연구재단 4단계 BK21 사업의 스마트 해양도시 인프라 교육연구단 과제(4199990614525)에 의하여 연구되었으며, 이에 깊은 감사를 드립니다.

References

  1. Bray, J. D. and Dasht, i S. (2010), "Liquefaction-induced movements of buildings with shallow foundations", MISSOURI S&T. 2010-Fifth International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, 24th-29th; OSP 2: pp. 1~10.
  2. Bray, J. D., Markham, C. S. and Cubrinovski, M. (2017), "Liquefaction assessments at shallow foundation building sites in the Central Business District of Christchurch", Soil Dynamics and Earthquake Engineering, 92: pp. 153~64. https://doi.org/10.1016/j.soildyn.2016.09.049
  3. Byung-Won Han, Hwa-Soo Son, In-Chool Sung, Young-Gyun Baek and Gay-Chun Lee (2010), "Case study of characteristics on lateral deformation in soft ground under embankment in the Nakdong River estuary(1)", KGS Spring National Conference 2010, pp.1178~1189 (In Korean).
  4. Cho, K.H., Kim, H.J., Park, Y.H. and Bae, K.T. (2011), "Evaluation of liquefaction mitigation of RAP (Rammed Aggregate Piers)", Korean Society of Hazard Mitigation, Vol. 6, pp. 175~ 181 (In Korean). https://doi.org/10.9798/KOSHAM.2011.11.6.175
  5. Hong, Eui and Sim, Dong-Hyun (2006), "A case study of ground treatment for container terminal site formation with full dredging and replacement method", Korean Association of Professional Soil Mechanics & Foundation Engineering, pp. 235~247 (In Korea).
  6. Ha, Ik-Soo and Oh, I-Tae (2020), "Feasibility study for revision of domestic liquefaction evaluation criteria by analyzing the liquefaction phenomenon caused by the Pohang earthquake", Journal of the Korean Geotechnical Society, Vol. 36, No, 4, pp. 17~30 (In Korea). https://doi.org/10.7843/KGS.2020.36.4.17
  7. Iai, S. (1989), "Similitude for shaking table tests on soil-structurefluid model In 1g gravitational field", Japanese Society of Mechanics and Foundation Engineering, Soils and Foundations Vol. 29, No. 1, pp. 105~118.
  8. Iai, S. and Sugano, T. (1999), "Soil-structure interaction studies through shaking table tests", Theme Lecture for the Second International Conference on Earthquake Geotechnical Engineering.
  9. Ishihara, K. (1985), "Stability of natural deposits during earthquakes", 11th Intl. Conf. on Soil Mechanics and Foundation Engineering, San Francisco, 1: pp. 321~376.
  10. Jeon, N.S., Choe, M.J., Kwon, O.K. and Kim, D.S. (2006), "A study on size effect of model test by 1g shaking table test and one-dimensional ground response analysis", Korean Society of Civil Eng., pp. 4116~4119.
  11. Kim, Jong-Kook and Chae, Ypung-Su (2006), "A study on the evaluation of the effect of the ground improvement reclaimed land based on dynamic compaction method", Journal of the Korean Geotechnical Society, Vol. 22, No. 22, pp. 13~26 (In Korea).
  12. Park, Y.H., Kim, S.R., Kim, S.H. and Kim, M.M. (2000), "Liquefaction of embankments on sandy soils and the optimum countermeasure against the liquefaction", Jour. of the KGS., 16: pp. 15~21.
  13. Rasouli, R., Hayashida, T. and Towhata, I. (2012), "Experimental study on subsidence of structures due to liquefaction and its mitigation", JAEE. International symposium on earthquake engineering. November; Tokyo, Japan, 8-10: pp. 199~208.
  14. Rasouli, R., Towhata, I. and Hayashida, T. (2015), "Mitigation of seismic settlement of light surface structures by installation of sheet-pile walls around the foundation", Soil Dynamics and Earthquake Engineering, 72: pp. 108~118. https://doi.org/10.1016/j.soildyn.2015.02.010
  15. Tanaka, H., Murata, H., Kita, H. and Okamoto, M. (2000), "Study on sheet pile wall method as a remediation against liquefaction", 12WCEE., 0535: pp. 1~8