Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of Dynamic Ground Properties of Pohang Area Based on In-situ and Laboratory Test

현장실험 및 동적실내실험을 이용한 포항지역 동적 지반특성 평가

  • Received : 2020.08.04
  • Accepted : 2020.09.01
  • Published : 2020.09.30
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Abstract

In 2017, after the Pohang earthquake, liquefaction phenomena were firstly observed after the observation of domestic earthquake by epicenter. In this study, various in-situ tests and laboratory tests were performed to determine the dynamic properties in (1) Songlim Park, (2) Heunghae-eup, Mangcheon-ri and (3) Heungan-ri, Pohang. As a site investigation, the standard penetration test (SPT), cone penetration test (CPT), multichannel analysis of surface wave (MASW), density logging, downhole test, and electrical resistivity survey were performed. In addition, cyclic triaxial test against sampled sand from site was also conducted. Based on the result, high ground water level and loose sand layer in shallow depth were observed for all sites. In addition, liquefaction resistance ratio of soil sampled from Songlim park was lower than those of Jumunjin sand, Toyoura sand, and Ottawa sand.

2017년 발생한 포항지진에서는 계기지진 이래 처음으로 액상화 현상이 목격되었다. 본 연구에서는 액상화 현상이 목격된 포항시 (1) 송림공원, (2) 흥해읍 망천리, (3) 흥안리를 대상으로 다양한 지반조사 및 실내실험을 수행하였다. 액상화 발생위치의 동적특성을 파악하기 위해 지반조사 항목으로는 표준관입시험(SPT), 콘관입시험(CPT), 표면파탐사(MASW), 밀도검층, 다운홀테스트, 전기비저항탐사를 수행하였고, 현장에서 채취한 시료를 바탕으로 진동삼축압축 시험기를 통해 액상화실험을 수행하였다. 그 결과 세 곳 모두 지하수위가 높고 얕은 심도에 연약한 모래층이 존재하며, 송림공원에서 채취한 모래는 주문진 표준사, Toyoura 모래, Ottawa 모래에 비해 액상화 저항강도가 작은 것을 확인하였다.

Keywords

References

  1. Asadi, M. S., Asadi, M. B., Orense, P. E., and Pender, M. J. (2018), "Undrained Cyclic Behavior of Reconstituted Natural Pumiceous Sands", Journal of Geotechnical and Geoenvironmental Engineering, Vol.144, No.8, 04018045.
  2. ASTM, International (2019), D5311 Standard Test Method for Load Controlled Cyclic Triaxial Strength of Soil. West Conshohocken, PA.
  3. ASTM, International (2019), D5778 Standard Test Method for Electronic Friction Cone and Piezocone Penetration Testing of Soils. West Conshohocken, PA.
  4. Carraro, J. A. H., Bandini, P., and Salgado, R. (2003), "Liquefaction Resistance of Clean and Nonplastic Silty Sands Based on Cone Penetration Resistance", Journal of Geotechnical and Geoenvironmental Engineering, Vol.129, No.11, pp.965-976. https://doi.org/10.1061/(ASCE)1090-0241(2003)129:11(965)
  5. Choi, M. G., Seo, K. B., Park, S. Y., and Kim, S. I. (2005), "Experimental Study on the Effect of Particle Size Distribution of Soil to the Liquefaction Resistance Strength", Proceedings of the KGS spring conference 2005, Jeju, South Korea.
  6. Cubrinovski, M., Henderson, D., and Bradley, B. (2012), "Liquefaction Impacts in Residential Areas in the 2010-2011 Christchurch Earthquakes", Proceedings of the International Symposium on Engineering Lessons Learned from the 2011 Great East Japan Earthquake, 3-4 March, pp.811-824.
  7. De Alba, P., Seed, H. B., and Chan, C. K. (1976), "Sand Liquefaction in Large-scale Simple Shear Tests", Journal of the Geotechnical Engineering Division, Vol.102, No.9, pp.909-927. https://doi.org/10.1061/AJGEB6.0000322
  8. Hegazy, Y. A. and Mayne, P. W. (1995), Statistical Correlations between VS and Cone Penetration Data for Different Soil Types, Proceedings international symposium on cone penetration testing CPT'95, Vol.2, pp.173-178.
  9. Idriss, I. and Boulanger, R. W. (2008), Soil liquefaction during earthquakes, Earthquake engineering research institute.
  10. Ishihara, K. (1996), Soil behavior in earthquake geotechnics, The Oxford engineering science series.
  11. Ishihara, K. and Yamazaki, F. (1980), "Cyclic Simple Shear Tests on Saturated Sand in Multi-directional Loading", Soils and Foundations, Vol.20, No.1, pp.45-59. https://doi.org/10.3208/sandf1972.20.45
  12. Jaime, A. and Romo, M. P. (1988), The Mexico Earthquake of September 19, 1985-correlations between Dynamic and Static Properties of Mexico City Clay, Earthquake spectra, Vol.4, No.4, pp.787-804. https://doi.org/10.1193/1.1585502
  13. Jeong, Nam-Hoon (2009), Behavior of Shear Wave Velocity Based on Suspension PS Logging Tests, Doctor's thesis, Dankook University, pp.90-95.
  14. KLHC (2009), Measurement and application of shear wave velocity for resonable soil classification in seismic design, Korea Land and Housing Corporation.
  15. Korea Meteorological Administration (2018), Pohang Earthquake Report.
  16. Ladd, R. S. (1978), "Preparing Test Specimens Using Under Compaction", Geotechnical Testing Journal, Vol.1, No.1, pp.16-23. https://doi.org/10.1520/GTJ10364J
  17. Long, M. and Donohue, S. (2010), Characterization of Norwegian Marin Clays with Combined Shear Wave Velocity and Piezocone Cone Penetration Test (CPTU) data, Canadian geotechnical journal, Vol.47, No.7, pp.709-718. https://doi.org/10.1139/T09-133
  18. Mayne, P. W. and Rix, R. J. (1995), Correlations between Cone Tip Resistance and Shear Wave Velocity in Natural Clay, Soils and Foundations, Vol.35, No.2, pp.107-110. https://doi.org/10.3208/sandf1972.35.2_107
  19. Ministry of Oceans and Fisheries (2018), Seismic design standard of Port and Harbor (KDS 64 17 00).
  20. Ministry of the Interior and Safety (2018), Seismic design criteria common application.
  21. National Research Council (NRC) (1985), Liquefaction of soils during earthquakes, National Academy Press., Washington, D.C.
  22. NDMI (2017), The investigated result of liquefaction due to Pohang earthquake (2017.11.15.), National Disaster Management Research Institute.
  23. Piratheepan, P. (2002), Estimating shear-wave velocity from SPT and CPT data, Clemson university (Master of science thesis).
  24. Seed, H. B., Tokimatsu, K., Harder, L. F., and Chung, R. K. (1985), "Influence of SPT procedures in soil liquefaction resistance evaluations", Journal of geotechnical engineering, Vol.111, No.12, pp.861-878.
  25. Sun, C. K., Kim, H. J., and Chung, C. K. (2008), Deduction of Correlations between Shear Wave Velocity and Geotechcnial In-situ Penetration Test Data, Journal of earthquake engineering society of Korea, Vol.12, No.4, pp.1-10. https://doi.org/10.5000/EESK.2008.12.4.001
  26. Sykora, D. W. and Stokoe, K. H. (1983), Correlations of In-situ Measurements in Sands of Shear Wave Velocity, Soil dynamics and earthquake engineering, Vol.20, pp.125-136. https://doi.org/10.1016/S0267-7261(00)00044-0
  27. Vaid, Y. P. and Sivathayalan, S. (1996), "Static and Cyclic Liquefaction Potential of Fraser Delta Sand in Simple Shear and Triaxial Tests", Canadian Geotechnical Journal, Vol.33, No.2, pp.281-289. https://doi.org/10.1139/t96-007
  28. Yasuda, S., Harada, K., and Ishikawa, K. (2012), "Characteristics of Liquefaction in Tokyo Bay Area by the 2011 Great East Japan Earthquake", Soils and Foundations, Vol.52, No.5, pp.793-810. https://doi.org/10.1016/j.sandf.2012.11.004
  29. Yoshimi, Y., Tokimatsu, K., Kaneko, O., and Makihara, Y. (1984), "Undrained Cyclic Shear Strength of a Dense Niigata Sand", Soils and Foundations, Vol.24, No.4, pp.131-145. https://doi.org/10.3208/sandf1972.24.4_131

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