한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제37권12호
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  • Pages.107-116
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  • 2021
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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불교란시료를 활용한 포항시 송림공원 사질토층의 액상화저항강도 평가

Evaluation of Liquefaction Resistance of Sandy Soil Layer in Songlim-park, Pohang, Using Undisturbed Sample

  • Kim, Jongkwan (Korea Institute of Civil Engrg. and Building Technology) ;
  • Han, Jin-Tae (Korea Institute of Civil Engrg. and Building Technology) ;
  • Park, Ka-hyun (Korea Institute of Civil Engrg. and Building Technology) ;
  • Lee, Seokhyung (Korea Institute of Civil Engrg. and Building Technology)
  • 투고 : 2021.12.06
  • 심사 : 2021.12.17
  • 발행 : 2021.12.31
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초록

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.

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.

키워드

과제정보

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었습니다(21SCIP-C151438-03).

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