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2021 Vol.37, Issue 12 Preview Page
Evaluation of Liquefaction Resistance of Sandy Soil Layer in Songlim-park, Pohang, Using Undisturbed Sample

불교란시료를 활용한 포항시 송림공원 사질토층의 액상화저항강도 평가

Jongkwan Kim1
,
Jin-Tae Han2
,
Ka-hyun Park3
,
Seokhyung Lee4*
김 종관1
,
한 진태2
,
박 가현3
,
이 석형4*
1Member, Senior Researcher, Korea Institute of Civil Engrg. and Building Technology
2Member, Research Fellow, Korea Institute of Civil Engrg. and Building Technology
3Member, Senior Researcher, Korea Institute of Civil Engrg. and Building Technology
4Member, Postdoctoral Researcher, Korea Institute of Civil Engrg. and Building Technology
1정회원, 한국건설기술연구원 수석연구원
2정회원, 한국건설기술연구원 연구위원
3정회원, 한국건설기술연구원 수석연구원
4정회원, 한국건설기술연구원 박사후연구원
*Corresponding Author
31 December 2021. pp. 107-116
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Abstract

In this study, a set of laboratory liquefaction test has been conducted using undisturbed samples collected from Songlim-park, Pohang where liquefaction phenomenon had been observed in 2017. Soil samples were frozen right after tube sampling to minimize the disturbances during transport, storage, and test preparation. Cyclic triaxial test has been carried out to evaluate the liquefaction resistance ratio of undisturbed soil samples. As a result, the liquefaction resistance ratio of samples collected from 8.0~8.8 m and 11.0~11.8 m were almost similar, and these values were approximately 0.04~0.07 larger than values estimated by simplified assessment method using field test results. It is expected that the application of undisturbed sample for the evaluation of liquefaction resistance could contribute to the economical design of geotechnical structures.

Keywords
Cyclic triaxial
Freezing
Laboratory test
Liquefaction
Undisturbed sample

본 연구에서는 2017년 포항지진 시 액상화 현상이 목격된 포항시 송림공원에서 불교란 시료를 채취하여 액상화 실내실험을 수행하였다. 채취한 불교란시료는 현장에서 동결시킴으로써 이동 및 보관, 그리고 실내실험 시 발생할 수 있는 교란을 최소화 하는 방법을 적용하였다. 동결 보관한 불교란시료를 활용하여 반복삼축압축실험을 통해 액상화저항강도를 산출하였다. 그 결과 심도 8.0~8.8m 및 11.0~11.8m에서 채취한 시료는 유사한 액상화 저항강도를 나타냈으며, 간편법을 통해 산출한 액상화저항강도와 비교하여 0.04~0.07가량 큰 값을 나타냈다. 이는 연대효과 및 간편법의 경우 안전측 설계를 위하여 하한선을 채택하고 있기 때문으로 판단된다. 이를 통해 불교란 시료를 활용할 경우 경제적설계에 기여할 수 있을 것으로 보인다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 37
  • No :12
  • Pages :107-116
  • Received Date : 2021-12-06
  • Revised Date : 2021-12-17
  • Accepted Date : 2021-12-17
  • DOI :https://doi.org/10.7843/kgs.2021.37.12.107
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