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

  • 제14권6호
  • /
  • Pages.13-19
  • /
  • 2013
  • /
  • 1598-0820(pISSN)
  • /
  • 2714-1233(eISSN)
한국지반환경공학회 (Korean Geo-Environmental Society)
권호 표지

Arias Intensity 액상화 평가기법의 적용성에 관한 연구

A Study on the Applicability of Arias Intensity Liquefaction Assessment

  • Hwang, Jungtae (Dept. of Civil and Environmental Engineering, Univ. of Incheon & Korea Infrastructure Safety Corporation) ;
  • Lee, Jongkeun (Dept. of Civil and Environmental Engineering, Univ. of Incheon & Korea Infrastructure Safety Corporation) ;
  • Shin, Eunchul (Dept. of Civil and Environmental Engineering, Univ. of Incheon)
  • 발행 : 2013.06.01
⟨ 이전 논문 다음 논문 ⟩

초록

본 연구에서는 액상화 평가 대상지반을 선정하여 미국, 일본 등 액상화 발생지역에 적용한 사례가 있는 에너지를 기반으로 하는 Arias intensity 액상화 평가법을 적용하고, 적용성을 검토하기 위하여 기존의 원위치시험을 통한 액상화 간편예측법을 수행하여 평가결과를 비교하였다. 대상지반에 대한 액상화 평가결과, Hachinohe 지진과 Ofunato 지진의 실지진기록을 이용한 Arias Intensity 안전율은 간편예측 안전율과 유사하게 산정되었으며, 설계응답스펙트럼으로부터 작성된 인공지진의 경우 Arias Intensity 안전율은 간편예측 안전율과 비교하여 다소 차이가 나타났다. 액상화를 발생시키는 전단응력비와 발생강도는 응력과 에너지라는 서로 다른 개념으로 산정되지만, 간편예측법의 전단저항응력비와 Arias Intensity의 저항강도는 실지진에 따른 액상화 발생지역을 대상으로 한 표준관입시험 등 경험적 도표를 사용한다는 점에서 Hachinohe 지진과 Ofunato 지진의 경우 Arias Intensity 평가법과 응력개념의 간편예측법 사이에 비슷한 결과가 나타난 것으로 판단된다. 따라서, 에너지를 기반으로 하는 Arias Intensity 액상화 평가법은 응력개념의 간편예측법에서 고려하지 않은 실지진 기록에 대한 가속도, 지속시간, 진폭 등의 지진특성으로 야기되는 지반의 동적변화를 표현할 수 있음을 확인할 수 있었다.

In this study, the target ground was selected for the assessment of liquefaction, for which energy-based Arias intensity liquefaction assessment method was applied, The results of evaluation by simplified method using conventional in-situ test were compared. The result of the assessment of liquefaction revealed that the safety factor of the Arias Intensity using the actual records of the Hachinohe and Ofunato earthquake showed generally similar trends with the simplified method, However, the Arias Intensity factor of safety for the artificial earthquake created from the design response spectrum showed some difference from the factors of safety of the simplified method. The shear stress ratio and the occurrence strength of the Arias Intensity are differently calculated between stress and energy, but the resistance stress ratio of the simplified method and the resistance strength of the Arias Intensity use the empirical chart of the results of the standard penetration test for the actual liquefaction areas by the earthquake, which seems the reason for the similar results between Arias Intensity assessment and stress concept simplified method for Hachinohe and Ofunato earthquakes. Therefore, it was found that the energy-based Arias Intensity liquefaction assessment could represent the dynamic changes of the ground caused by seismic characteristics such as acceleration, magnitude, duration and amplitude.

키워드

참고문헌

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