Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Comparative Study on the Evaluation of Liquefaction Resistance Ratio According to the Application of the Korean Standard for Cyclic Triaxial Strength Test

반복삼축강도시험의 KS 표준 제정에 따른 액상화 저항강도 평가 비교 연구

  • Lee, Seokhyung (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) ;
  • Kim, Jongkwan (Korea Institute of Civil Engrg. and Building Technology)
  • Received : 2022.08.03
  • Accepted : 2022.08.11
  • Published : 2022.09.30
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Abstract

The cyclic triaxial strength test is commonly applied as a laboratory test for evaluating the liquefaction resistance ratio. However, the test procedure was not standardized in South Korea until recently; thus, the test results could significantly differ depending on the performer and apparatus, even when identical soil is used. In this study, the American and Japanese standards for the cyclic triaxial strength test were analyzed and the Korean standard was developed considering domestic circumstances. To verify the effectiveness of the standardization of liquefaction laboratory tests, several cases of cyclic triaxial strength tests were conducted and analyzed (1) following the Korean standard and (2) without following any specific instructions for the test procedure. Under (1), the deviation of the liquefaction resistance ratio dramatically decreased.

흙의 액상화 저항강도를 실내실험을 통해 산출할 때 일반적으로 반복삼축강도시험장비가 사용된다. 하지만, 국내의 경우 반복삼축강도시험 방법이 표준화되어 있지 않아 기관별로 상이한 실험방법으로 실험을 수행하고 있어 동일한 시료임에도 큰 편차가 발생하는 문제가 있다. 본 연구에서는 미국과 일본의 반복삼축강도시험 기준을 분석하고 이를 바탕으로 국내실정을 고려한 반복삼축강도시험 방법의 표준화를 수행하였다. 액상화 실험방법의 표준화에 따른 효용성을 검토하기 위해 표준화되지 않았던 기존의 실험방법과 표준화된 실험방법 두 방식을 통해 동일 시료에 대한 액상화 저항강도 평가를 수행하였으며 이를 통해 표준화에 따른 실험결과의 편차를 분석하였다. 그 결과, 표준화된 방법을 통해 실험을 수행한 경우 기관별 차이가 크게 줄어드는 것을 확인 할 수 있었다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었으며 이에 감사드립니다(과제번호: 22SCIP-C151438-04).

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