한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

한국지반공학회 (Korean Geotechnical Society)
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SPT와 CPT 지반조사결과에 기초한 포항지역 액상화 위험도 평가

Evaluation of Liquefaction Triggering for the Pohang Area Based on SPT and CPT Tests

  • 김연준 (한국과학기술원 건설 및 환경공학과) ;
  • 고길완 (한국과학기술원 건설 및 환경공학과) ;
  • 김병민 (울산과학기술대학교 도시환경공학과) ;
  • 박두희 (한양대학교 건설환경공학과) ;
  • 김기석 ((주)희송지오텍) ;
  • 한진태 (한국건설기술연구원 인프라안전연구본부 지진안전센터) ;
  • 김동수 (한국과학기술원 건설 및 환경공학과)
  • 투고 : 2020.09.28
  • 심사 : 2020.10.16
  • 발행 : 2020.10.31
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초록

본 연구에서는 2017년 11월 15일 포항지진 시 액상화 위험도가 높았던 5개소의 부지에 대해 액상화 가능성을 재분석하였다. 액상화 지진 하중은 포항 지진파를 지반예측운동방정식(Ground motion prediction equation, GMPE)로 산정한 응답스펙트럼에 보정한 결과를 입력 지진파로 사용하였다. 지반의 액상화 저항력은 현장 시험 중 표준관입시험(Standard Penetration Test, SPT)과 콘관입시험(Cone penetration test, CPT)을 통해 결정되었다. 한편, 액상화 발생 가능성은 지반 액상화 지수(LPI)를 통해 정량화되었으며 이를 기존 연구 결과와 비교하였다.

Liquefaction-induced sand boils were observed during the Pohang earthquake (Moment magnitude, 5.4) on November 15, 2017, specifically in the region of agricultural fields and park areas near the epicenter. This was recorded as the first observed liquefaction phenomenon in Korea. This paper analyzes liquefaction potentials at the key sites at Pohang area. The simplified methods and current design standard were used to evaluate the occurrence of liquefaction. The seismic demand was estimated based on the NGA-WEST2 ground motion prediction equations (GMPEs). The liquefaction resistance of the ground was determined using the in-situ tests: standard penetration test (SPT) and cone penetration test (CPT). The liquefaction potentials were quantified by liquefaction potential index (LPI), which were compared with those from the previous studies.

키워드

참고문헌

  1. Ministry of Interior and Safety (2018), Pohang earthquake white paper, Ministry of Interior and Safety, Korea.
  2. Kim, Y.J., Ko, K.W., Manandhar, S., Kim, B.M., and Kim, D.S. (2020), "Overview on Standards for Liquefaction Triggering Evaluation using the Simplified Method", EESK J. Earthquake Eng., Vol.24, No.4, pp.197-209.
  3. Kwak, C.W., Choi, J.S., Khang, K.J., and Kim, S.I. (2002), "Development of the Method for Liquefaction Hazard Microzonation in Korean Coastal Area", KBS spring conference, Seoul, pp.431-438.
  4. Seo, M. W., Sun, C. G., and Oh, M. G. (2009), "LPI-based Assessment of Liquefaction Potential on the West Coastal Region of Korea", EESK J. Earthquake Eng., Vol.13, No.2, pp.1-13. https://doi.org/10.1080/13632460902813190
  5. Koo, T. J. (2010), "Develoment of mapping of liquefaction hazard considering various ground condition in Korea", MS thesis, Seokyeong National Univ.
  6. Saeed-ullah, J. M., Park, D. H., Kim, H. S., and Park, K. C. (2016), "Cyclic Simple Shear Test based Design Liquefaction Resistance Curve of Granular Soil", Journal of the Korean Geotechnical Society, Vol.32, No.3, pp.49-59. https://doi.org/10.7843/kgs.2016.32.6.49
  7. Baek, W. H., Choi, J. S., and Ahn, J. K. (2018), "Liquefaction Hazard Map Based on in Pohang Under Based on Earthquake Scenarios", EESK J. Earthquake Eng., Vol.22, No.3, pp.219-222.
  8. Ahn, J. K., Baek, W. H., Choi, J. S., and Kwak, D. Y. (2018), "Investigation of Pohang Earthquake Liquefaction Using 1D Effective-Stress Site Response Analysis", Journal of Korean Geotechnical Society, Vol.34, No.8, pp.37-49. https://doi.org/10.7843/KGS.2018.34.8.37
  9. Choi, J. S. (2016), "A Proposal on Micro and Macro Mapping Methods for Liquefaction Hazard in Korea", Journal of Korean Society of Disaster & Security, pp.207-215.
  10. Yoo, B. S., Bong, T. H., and Kim, S. R. (2019), "Evaluation Methods of Cyclic Shear Stress Ratio for the Assessment of Liquefaction in Korea", Journal of Korean Geotechnical Society, Vol.35, No.6, pp.5-15. https://doi.org/10.7843/KGS.2019.35.6.5
  11. Jang, Y.E., Seo, H.W., Kim, B.M., Han, J.T., and Park, D.H. (2020), "Selection of Ground Motions for the Assessment of Liquefaction Potential for South Korea", EESK J. Earthquake Eng., Vol.24, No.2, pp.111-119.
  12. Ministry of Land, Infrastructure and Transport (2018), General Seismic Design (KDS 17 10 00), Ministry of Land, Infrastructure and Transport, Korea.
  13. Ministry of Land, Infrastructure and Transport (2016), Foundation Design Criteria (KDS 11 50 25). Ministry of Land, Infrastructure and Transport, Korea.
  14. Ministry of Land, Infrastructure and Transport and Korea Infrastructure Safety Corporation (2020), Guidelines for evaluating and improving earthquake resistance of existing facilities (Foudation and ground) Ministry of Land, Infrastructure and Transport, Korea.
  15. Seed, H. B. and Idriss, I. M. (1971), "Simplified Procedure for Evaluating Soil Liquefaction Potential", J. of the Soil Mechanics and Foundation Devision, Vol.97, No.9, pp.1249-1273. https://doi.org/10.1061/JSFEAQ.0001662
  16. Ha, I. S. and Oh, I. T. (2020), "Feasibility Study of Domestic Liquefaction Evaluation Criteria by Analyzing the Liquefaction Phenomenon Caused by the Pohang Earthquake", Journal of Korean Geotechnical Society, Vol.36, No.5, pp.17-30. https://doi.org/10.7843/KGS.2020.36.5.17
  17. Youd, T. L., Idriss, I .M., Andrus, R. D., Arango, I., Castro, G., Christian, J. T., and Ii K. H. S. (2001), "Liquefaction Resistance of Soils: Summary Report from the 1996 NCEER and 1998 NCEER/NSF Workshops on Evaluation of Liquefaction Resistance of Soils", Journal of Geotechnical and Geoenvironmental Engineering, Vol.127, No.10, pp.817-833. https://doi.org/10.1061/(ASCE)1090-0241(2001)127:10(817)
  18. Idriss, I. M. and Boulanger, R. W. (2008), Soil liquefaction during earthquakes, Earthquake Engineering Research Institute, California
  19. Boulanger, R. W. and Idriss, I. M. (2014), "CPT and SPT based liquefaction triggering procedures", Center for Geotechnical Modeling Department of Civil and Environmental Engineering University of California Davis, California.
  20. Kayen, R. E., Moss, R. E., Thompson, E.M., Seed, R.B., Cetin, K.O., Der Kiureghian, A., and Tokimatsu, K. (2013), "Shear-Wave Velocity-based Probabilistic and Deterministic Assessment of Seismic Soil Liquefaction Potential", Journal of Geotechnical and Geoenvironmental Engineering, Vol.139, No.3, pp.407-419. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000743
  21. Cetin, K. O., Seed, R. B., Kiureghian, A., Tokimatsu, K., Harder, Jr L. F., Kayen, R. E., and Moss, R. E. (2004), "Standard Penetration Test-based Probabilistic and Deterministic Assessment of Seismic Soil Liquefaction Potential", Journal of Geotechnical and Geoenvironmental Engineering, Vol.130, No.12, pp.1314-1340. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:12(1314)
  22. National Disaster Management Research Institute (2017), The investigated result of liquefaction due to Pohang earthquake. Korea.
  23. Ha, I. S. and Jung, M. S. (2018), "A Case Study on Liquefaction Occurred During the Pohang Earthquake", Proc. of EESK Conference, Korea, pp.15-16.
  24. Park, S. S., Nong, Z. Z., Choi, S. G., and Moon, H. D. (2018), "Liquefaction Resistnace of Pohang sand", Journal of Korean Geotechnical Society, Vol.34, No.9, pp.5-17. https://doi.org/10.7843/kgs.2018.34.9.5
  25. Bae, S.J., Kim, M. R., Lee, H. J., and Kim, B. M. (2018), "Characteristics of the Gyeongju Earthquake Ground Motions: Comparison with Prediction Models", Korean Society of Hazard Mitigation, Vol.18, No.1, pp.57-67. https://doi.org/10.9798/kosham.2018.18.1.57
  26. Hashash, Y. M. A., Musgrove, M. I., Harmon, J. A., Okan, I., Groholski, D. R., Phillips, C. A., and Park, D. (2001), DEEPSOIL 7.0. User Manual, University of Texas at Austin, pp.38-61.
  27. Seed, H. B. and Idriss, I. M. (1970), "Soil moduli and damping factors for dynamic response analysis", Report No EERC 70-10 Earthquake Engineering Reserch Center University of California, Berkeley, pp.1-40.
  28. Vucetic, M. (1992), "Soil Properties and Seismic Response", In Proceeding of 10th world conference of earthquake engineering; Madrid, pp.1199-1204.
  29. Sun, C. G., Kim, D. S., and Chung, C. K. (2005), "Geologic Site Conditions and Site Coefficients for Estimating Earthquake Ground Motions in the Inland Areas of Korea", Engineering Geology, Vol.81, No.4, pp.446-469. https://doi.org/10.1016/j.enggeo.2005.08.002
  30. Kim, D. S. and Choo, Y. W. (2001), "Deformation Characteristics of Hydraulic-filled Cohesionlesssoils in Korea", In Proceedings of 4th International Conference on Recent Advances in Geotechnical, San Diego, pp.20-27.
  31. Bong, T. H., Kim, S. R., and Yoo, B. S. (2019), "Evaluation of Estimation and Variability of Fines Content in Pohang for CPT-based Liquefaction Assessment", Journal of the Korean Geotechnical Society, Vol.35, No.3, pp.37-46. https://doi.org/10.7843/KGS.2019.35.3.37
  32. Cubrinoski, M., Ntritsos, N., Dhakal, R., and Arhodes. (2019), "Key Aspects in Theengineering Assessment of Soil Liquefaction", In Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, Roma, Italy, pp.189-208.
  33. Iwasaki, T., Tatsuoka, F., Tokida, K. I., and Yasuda, S. A. (1978), "A Practical Method for Assessing Soil Liquefaction Potential Based on Case Studies at Various Sites in Japan", In Proceedings 2nd International Conference on Microzonation Safer Construction Research and Application, Japan, pp.885-896.
  34. Luna, R. and Frost, J. D. (1998), "Spatial Liquefaction Analysis System", J. Computing in Civil Engineering, Vol.12, No.1, pp. 48-56. https://doi.org/10.1061/(ASCE)0887-3801(1998)12:1(48)