Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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A Study on the Application of Lateral Earth Pressure to Earth Retaining Wall Considering Ground Characteristics in Jeju II - Case of Earth Anchor Construction -

제주 지역의 지반 특성을 고려한 흙막이벽의 측방토압 적용에 관한 연구 II -어스앵커 공법 시공 사례-

  • Do-Hyeong Kim (Dept. of Civil Engineering, Jeju National Univ.) ;
  • Dong-Wook Lee (Dept. of Civil Engineering, Jeju National Univ.) ;
  • Seung-Hyun Kim (Jeju Special Self-Governing Provincial Council) ;
  • Kwon-Moon Ko (Korea Rual Community Corporation, Jeju Regional Heafquarter)
  • Received : 2023.05.02
  • Accepted : 2023.06.21
  • Published : 2023.06.30
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Abstract

This paper describes the comparative results of measured and predicted values for the horizontal displacement of earth retaining wall based on two field cases, in order to evaluate the application of lateral earth pressure to earth retaining wall supported by earth anchor in Jeju. The prediction of lateral earth pressure acting on the earth retaining wall was performed by elasto-plastic analysis using Rankine earth pressure, Hong & Yun lateral earth pressure, Terzaghi & Peck modified lateral earth pressure, and Tschebotarioff lateral earth pressure. As a result, the predicted value of the maximum horizontal displacement for site A was about 10 to 12 times greater than the measured value, and in the case of site B, the predicted value was evaluated as about 9 to 12 times greater than the measured value. That is, both sites showed a similar increase rate in the maximum horizontal displacement by the predicted value compared to the measured value. In all field construction cases, the maximum horizontal displacement by measured values occurred in the sedimentary layer, soft rock layer, and clinker layer, and the horizontal displacement distribution was shown in a trapezoidal shape. The maximum horizontal displacement by the predicted value occurred around the clinker layer, and the horizontal displacement distribution was elliptical. In the ground with a clinker layer, the measured value showed a very different horizontal displacement tendency from the predicted value, because the clinker layer exists in the form of a rock layer and continuous layer. In other words, it is unreasonable to apply the existing prediction method, which is overestimated, because the characteristics of the earth pressure distribution in Jeju show a tendency to be quite different from the predicted earth pressure distribution. Therefore, it is necessary to conduct a research on the lateral earth pressure in the realistic Jeju that can secure more economic efficiency.

본 연구에서는 제주 지역에서 어스앵커로 지지된 흙막이벽의 측방토압 적용을 평가하기 위하여, 2개의 현장 시공 사례를 기반으로 수평변위에 대한 계측값과 예측값을 비교하였다. 흙막이벽에 작용하는 측방토압의 예측은 Rankine 토압, Hong & Yun 측방토압, Terzaghi & Peck 수정측방토압, Tschebotarioff 측방토압을 이용하여 탄소성해석을 실시하였다. 그 결과, A현장에 대한 최대 수평변위의 예측값은 계측값에 비하여 약 10배~12배로 화인되었으며, B현장의 경우에는 예측값이 계측값보다 약 9배~12배로 평가되었다. 즉, 2개 현장 모두 계측값에 비해 예측값에 의한 최대 수평변위가 유사한 증가율을 보였다. 모든 현장 사례에서 계측값에 의한 최대 수평변위는 퇴적층, 연암층 및 클링커층에서 발생하였고, 수평변위 형상은 사다리꼴 형태에 나타냈다. 그리고 예측값에 의한 최대 수평변위는 클링커층 주변에서 발생하였으며, 수평변위 형상은 타원형으로 나타났다. 클링커층이 혼재되어 있는 지반에서 계측값이 예측값과 매우 다른 수평변위 경향을 보이는 원인으로는 클링커층이 암반층과 연속된 지층의 형태로 존재하기 때문으로 판단되었다. 즉, 예측되는 토압 분포와 상당히 다른 경향을 보이는 제주 지역의 토압 분포 특성을 고려하면 과다하게 평가되는 기존의 예측방법을 적용하는 것은 다소 무리가 있을 것으로 판단되기 때문에, 보다 경제성을 확보할 수 있는 현실적인 제주 지역의 측방토압에 관한 연구가 수행될 필요가 있다.

Keywords

Acknowledgement

This research was supported by the 2022 scientific promotion program funded by Jeju National University

References

  1. Das, B. M. (1984), Principles of Foundation Engineering, 3th Ed., PWS Publishing, pp.423-425.
  2. Hong, W. P. and Yun, J. M. (1995), "Lateral Earth Pressure Acting on Anchored Retention Walls for underground Excavation", Journal of the Korea Geotechnical Society, Vol.11, No.1, pp.63-78.
  3. Kim, J. H. (2006), A study on the mechanical characteristics and the strength in Pyoseonri basalt, Thesis, Cheju National University. (in Korean)
  4. Kim, S. H. and Lee, D. W. (2016), "Analysis of Blasting Vibration at the Irregular Layered Structure Ground", Journal of the Korean Society of Civil Engineers, Vol.36, No.5, pp.891-901. (in Korean) https://doi.org/10.12652/Ksce.2016.36.5.0891
  5. Kim, S. H. and Lee, D. W. (2019), "Analysis of Ground Vibration Characteristics by Test Blasting in Southern Region of Jeju", Journal of the Korean Society of Civil Engineers, Vol.39, No.3, pp.419-429. (in Korean) https://doi.org/10.12652/KSCE.2019.39.3.0419
  6. Kim, S. H., Lee, D. W., Kang, J. S. and Lee, K. S. (2017), "Analysis of Shear Wave Velocity of the Clinker Layer in Jeju", 2017 KSCE convention, pp.13-14. (in Korean)
  7. Korea Institute of Geoscience and Mineral Resources (2013), Experience the Geological Splendor of Jeju Island: The Visitor's Guide, Rodem Design Institute, Daejeon, pp.41-46.
  8. Lambe, T. W. and Whitman, R. V. (1979), Soil Mechanics, John Wiley & Sons, pp.185-188.
  9. Lee, K., Shin, H., Jung, H., Kim, D., Ryu, Y. and Kim D. (2019), "Evaluation of Shallow Foundation Behavior on Basalt Rock Layers With Clinker and Sediment Layers Reinforced Using Cement Grouting", Journal of the Korean Geosynthetics Society, Vol.18, No.3, pp.33-44. (in Korean)
  10. Lee, Y. G., Yun, J. M., Song, Y. S., Kim, K. Y. and Hong, K. (2015), "Permeability Characteristics of Cement Mixtures with Powdered Sludge of Basalt in Jeju Island", Journal of the Korean Geosynthetics Society, Vol.14, No.4, pp.159-165.  (in Korean) https://doi.org/10.12814/jkgss.2015.14.4.159
  11. Loock, S., van Wyk de Vries, B. and Henot, J.-M. (2010), "Clinker formation in basaltic and trachybasaltic lava flows", Bull Balcanol, Vol.72, pp.859-870. https://doi.org/10.1007/s00445-010-0362-y
  12. Moon, K., Boo, S. and Park, S. (2020), "Evaluation of Bearing Capacity of Clinker Layer in Jeju Island", 2020 KSCE convention, pp.1386-1388. (in Korean)
  13. Nam, J. M., Yun, J. M., Song, Y. S. and Kim, J. H. (2008), "Analysis of Engineering Properties to Basalt in Cheju island", Journal of the Korean Geosynthetics Society, Vol.7, No.1, pp.13-21. (in Korean)
  14. Park, K. H., Ahn, J. S., Ki, W. S. and Park, W. B. (2006), Jeju Island Geological Travel, KIGMR (Korea Institute of Geoscience and Mineral Resources). (in Korean)
  15. Terzaghi, K. and Peck, R. B. (1967), Soil Mechanics in Engineering practice, 2nd Ed., John Wiley and Sons, New York, pp.394-413.
  16. Terzaghi, K. and Peck, R. B. (1948), "Soil Mechanics in Engineering practice", 1st Ed., John Wiley and Sons, New York, pp.345-352.
  17. Tschebotarioff, G. P. (1973), Foundations, Retaining and Earth Structure, McGraw-Hill, New York, pp.415-457.
  18. Yang, K. H., Seo, S. D., Cho, Y. S. and Park, J. J. (2013), "Numerical Analysis of Offshore Wind Turbine Foundation Considering Properties of Soft layer in Jeju", Journal of the Korean Geosynthetics Society, Vol.12, No.4, pp.45-56. (in Korean) https://doi.org/10.12814/jkgss.2013.12.4.045
  19. Yoon, B. J., Park, S. Y. and Lee, S. J. (2022), "A Study on the Geotechnical Characteristics of Jeju Area Using Field Tests", Journal of the Society of Disaster Information, Vol.18, No.4, pp.769-777. (in Korean)  https://doi.org/10.15683/KOSDI.2022.12.31.769