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2024 Vol.40, Issue 4 Preview Page
Sensitivity Analysis Study of Geotechnical Factors for Gas Explosion Vibration in Shallow-depth Underground Hydrogen Storage Facility

저심도 지하 수소저장소에서의 가스 폭발 진동에 대한 지반공학적 인자들의 민감도 분석 연구

Gyu-Hyun Go1
,
Hyeon-Jae Woo2
,
Van-Hoa Cao2
,
Hee-Won Kim2
,
YoungSeok Kim3*
,
Hyun-Jun Choi4
고 규현1
,
우 현재2
,
카오 반호아2
,
김 희원2
,
김 영석3*
,
최 현준4
1Member, Associate Prof., Dept. of Civil Engineering, Kumoh National Institute of Tech.
2PhD Student, Dept. of Civil Engineering, Kumoh National Institute of Tech.
3Member, Senior Research Fellow, Hydrogen-Infrastructure Research Cluster, Korea Institute of Civil Engineering and Building Technology
4Member, Senior Researcher, Hydrogen-Infrastructure Research Cluster, Korea Institute of Civil Engineering and Building Technology
1정회원, 국립금오공과대학교 토목공학과 부교수
2비회원, 국립금오공과대학교 토목공학과 박사과정
3정회원, 한국건설기술연구원 수소인프라클러스터 선임연구위원
4정회원, 한국건설기술연구원 수소인프라클러스터 수석연구원
*Corresponding Author
31 August 2024. pp. 169-178
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Abstract

While stable mid- to large-scale underground hydrogen storage infrastructures are needed to meet the rapidly increasing demand for hydrogen energy, evaluating the safety of explosion vibrations in adjacent buildings is becoming important because of gas explosions in underground hydrogen storage facilities. In this study, a numerical analysis of vibration safety effects on nearby building structures was performed assuming a hydrogen gas explosion disaster scenario in a low-depth underground hydrogen storage facility. A parametric study using a meta-model was conducted to predict changes in ground dynamic behavior for each combination of ground properties and to analyze sensitivity to geotechnical influencing factors. Directly above the hydrogen storage facility, the unit weight of the ground had the greatest influence on the change in ground vibration due to the explosion, whereas, farther away from the facility, the sensitivity of dynamic properties was found to be high. In addition, in evaluating the vibration stability of ground building structures based on the predicted ground vibration data and blasting vibration tolerance criteria, in the case of large reinforced concrete building structures, the ground vibration safety was guaranteed with a separation distance of about 10-30 m.

Keywords
Equivalent TNT
Gas explosion
Meta-model
Sensitive analysis
Underground hydrogen storage

최근 급격히 늘어나는 수소 에너지 수요를 감당하기 위해 안정적인 중·대규모의 지하 수소 저장 인프라가 필요한 가운데, 지하수소저장소에서의 가스 폭발에 따른 인접 건축물의 폭발 진동 안전성 평가가 중요해지고 있다. 본 연구에서는 저심도 지하수소저장소의 수소가스 폭발 재난 시나리오를 가정하여 인근 건축구조물에 미치는 진동 안전성에 대한 수치해석을 수행하였다. 메타모델을 활용한 매개변수연구를 수행하여 지반물성 조합 별 지반 동적 거동 변화를 예측하고, 지반공학적 영향인자에 대한 민감도를 분석하였다. 수소 저장소 직상부에서는 지반의 단위중량이 폭발에 의한 지반 진동치 변화에 가장 큰 영향을 미치는 반면 저장소로부터 멀리 떨어질수록 지반의 동적 물성의 민감도가 높게 나타났다. 또한, 도출된 지반 진동치와 국내 발파진동 허용치 자료를 기반으로 지상 건축구조물들의 진동 안정성을 평가한 결과, 대형 철근 콘크리트 구조물의 경우 약 10-30m 수준의 이격거리 확보 시 지반진동 안전성이 보장되는 것으로 평가되었다.

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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 : 40
  • No :4
  • Pages :169-178
  • Received Date : 2024-08-12
  • Revised Date : 2024-08-19
  • Accepted Date : 2024-08-19
  • DOI :https://doi.org/10.7843/kgs.2024.40.4.169
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