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

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

DOI QR Code

Experimental Analysis of Liquefaction Resistance Characteristics of Silica Sand Used in Earthquake Simulation Tests

국내 지진 모의시험에 이용되는 규사의 액상화 저항특성에 관한 실험적 분석

  • Choi, Jaesoon (Civil & Architectural Engineering, Seokyeong University) ;
  • Jin, Yunhong (Geotechnical Department, Soosung Engineering & Consulting) ;
  • Baek, Woohyun (Construct System Engineering, Seoul National University of Science & Technology)
  • Received : 2021.12.28
  • Accepted : 2022.04.20
  • Published : 2022.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, dynamic characteristics and liquefaction resistance characteristics of silica sand which is used to simulate sandy layer were conducted using the cyclic triaxial test according to the relative density difference. The difference in liquefaction resistance with the relative density was confirmed through the test results, which the relative density conditions were changed to 40%, 60%, and 80%, and the cyclic resistance ratio (CRR) curve of the silica sand was obtained. In addition, in order to examine the validity of the liquefaction resistance ratio (CRR) curve, artificial silica sand ground was created, and liquefaction potential was evaluated through the simple assessment method and the detailed assessment method, and the safety factors of each were compared.

본 연구에서는 국내 지진모의시험 수행 시 모래지반의 모사를 위해 국내에서 널리 이용되는 지반재료인 인공규사를 대상으로 상대밀도 차이에 따른 진동삼축시험을 수행하여 인공규사의 동적특성 및 액상화 저항특성을 실험적으로 분석하였다. 상대밀도 조건을 40%, 60%, 80%로 달리한 시험결과를 통해 상대밀도에 따른 액상화 저항특성을 확인하였으며, 액상화 진동저항응력비(Cyclic resistance stress ratio, CRR) 산정 곡선을 도시하였다. 또한, 액상화 진동저항응력비(CRR) 산정곡선의 타당성을 검토하기 위해 실내진동삼축시험에 사용된 규사로 이루어진 인공지반을 조성한 후, 간편예측법과 상세예측법을 통한 액상화 평가를 수행하여 각각의 안전율을 비교·검토하였다. 최종적으로, 상대밀도를 달리한 실험을 통해 인공규사의 동적물성을 파악하여 결과를 도출하였으며, 이 결과를 물성치로 적용한 상대밀도 40% 간편예측법은 안전율이 1로 안전한 지반으로 도출된 반면 상세예측법은 0.05작은 값으로 결과가 도출되었다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었습니다(과제번호 22SCIP-C151438-04).

References

  1. Bao, N. N., Nghiem, X. T. and Kim, S. R. (2018), Evaluation of dynamic p-y curves of group piles using centrifuge model tests, Journal of the Korean Geotechnical Society, Vol. 34, No. 5, pp. 53~63 (In Korea). https://doi.org/10.7843/KGS.2018.34.5.53
  2. Darendeli, M. B. (2001), Development of a new family of normalized modulus reduction and material damping curves, University of Texas at Austin.
  3. Hwang, B. Y., Han, J. T., Kim, J. K. and Kwak, T. Y. (2020), Liquefaction characteristic of Pohang sand based on cyclic triaxial test, Journal of the Korean Geotechnical Society, Vol. 36, No. 9, pp. 21~32(In Korea). https://doi.org/10.7843/KGS.2020.36.9.21
  4. Idriss, I. and Boulanger, R. W. (2008), Soil liquefaction during earthquakes, Earthquake Engineering Research Institute.
  5. Ishihara, K. (1993), Liquefaction and flow failure during earthquakes, Geotechnique, Vol. 43, No. 3, pp. 351~451. https://doi.org/10.1680/geot.1993.43.3.351
  6. Jo, S. B., Ha, J. G., Choo, Y. W. and Kim, J. K. (2013), A case study of evaluating inertial effects for inverted T-shape retaining wall via dynamic centrifuge test, Journal of the Korean Geotechnical Society, Vol. 29, No. 4, pp. 33~44 (In Korea). https://doi.org/10.7843/KGS.2013.29.4.33
  7. Kim, J. K., Kwak, T. Y., Han, J. T., Hwang., B. Y. and Kim, K. S. (2020), Evaluation of dynamic ground properties of Pohang area based on in-situ and laboratory test, Journal of the Korean Geotechnical Society, Vol. 36, No. 9, pp. 5~20 (In Korea). https://doi.org/10.7843/KGS.2020.36.9.5
  8. Kim, S. I., Park, I. J. and Choi, J. S. (2000), A Study on the assessment of liquefaction potential in Korea, Journal of the Korean Society of Civil Engineers, Vol. 20, No. 2-C, pp. 129~139 (In Korea).
  9. Kim, S. R. (2018), Evaluation of dynamic p-y curves of group piles using centrifuge model tests, Journal of the Korean Geotechnical Society, Vol. 34, No. 5, pp. 53~63 (In Korea). https://doi.org/10.7843/KGS.2018.34.5.53
  10. Lee, C. J., Kim, S. I. and Jung, S. S. (2010), A study on the liquefaction resistance of anisotropic sample under real earthquake loading, Journal of the Korean Geotechnical Society, Vol. 26, No. 2, pp. 5~14 (In Korea). https://doi.org/10.7843/KGS.2010.26.2.5
  11. Lee, J. S., Park, T. J., Lee, M. G. and Kim, D. S. (2018), Verification of the numerical analysis on caisson quay wall behavior under seismic loading using centrifuge test, Journal of the Korean Geotechnical Society, Vol. 34, No. 11, pp. 57~70 (In Korea). https://doi.org/10.7843/KGS.2018.34.11.57
  12. MOF (2018), Korea Design Standard : Seismic Design of Port and Harbor (KDS 64 17 00).
  13. Seed, B. and Lee, K. L. (1966), Liquefaction of saturated sands during cyclic loading, Journal of Soil Mechanics and Foundations Division, ASCE, 4972 92 Proceeding.
  14. Seed, H. B. and Idriss, I. M. (1971), Simplified procedure for evaluating soil liquefaction potential, Journal of Soil Mechanics and Foundation Division, ASCE, Vol. 97, No. 9, pp. 1249~1273. https://doi.org/10.1061/JSFEAQ.0001662
  15. Seed, H. B., Tokimatsu, K. and Harder, L. (1984), The influence of SPT procedures in evaluating soil liquefaction resistance, UCB, Earthquake Engineering Research Center, University of California, Berkeley, EERC, pp. 84~15.
  16. Sun, C. K., Kim, H. J. and Chung, C. K. (2008), Deduction of correlations between shear wave velocity and geotechnical in-situ penetration test data, Journal of Earthquake Engineering Society of Korea, Vol. 12, No. 4, pp. 1~10 (In Korea). https://doi.org/10.5000/EESK.2008.12.4.001
  17. Shin, Y. S. (1999), A Study on the Modified Method for Assessing Liquefaction Potential Based on Korean Earthquake Magnitude, Master's thesis, Yonsei University, pp. 66~90 (In Korea).
  18. Skempton, A. W. (1954), The pore-pressure coefficients A and B, Geotechnique, Vol. 4, No. 4, pp. 143~147. https://doi.org/10.1680/geot.1954.4.4.143
  19. Skemptom, A. W. (1986), Standard penetration test procedures and the effects in sands of over-burden press, relative density, particle size, ageing and overconsolidation, Geo-technique, Vol. 36, No. 3, pp. 425~447
  20. Yoo, M. T. and Kwon, S. Y. (2018), Comparison of lateral pile behavior under static and dynamic loading by centrifuge tests, Journal of the Korean Geotechnical Society, Vol. 34, No. 7, pp. 51~58 (In Korea). https://doi.org/10.7843/KGS.2018.34.7.51
  21. Yun, J. W., Han, J. T. and Kim, J. K. (2020), Study on improvement of response spectrum analysis of pile-supported structure: focusing on the natural periods and input ground acceleration, Journal of the Korean Geotechnical Society, Vol. 36, No. 6, pp. 17~34 (In Korea). https://doi.org/10.7843/KGS.2020.36.6.17