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Effects of interface stiffness on dynamic behavior of connections between vertical shafts and tunnels under earthquake

지진 시 공동구용 수직구-터널 접속부 거동에 대한 경계면 강성 계수의 영향

  • Kim, Jung-Tae (Dept. of Civil and Environmental Engineering, KAIST) ;
  • Hong, Eun-Soo (Dept. of Civil and Environmental Engineering, Kongju National University) ;
  • Kang, Seok-Jun (Dept. of Civil and Environmental Engineering, KAIST) ;
  • Cho, Gye-Chun (Dept. of Civil and Environmental Engineering, KAIST)
  • 김정태 (한국과학기술원 건설 및 환경공학과) ;
  • 홍은수 (국립공주대학교 건설환경공학부 토목환경공학전공) ;
  • 강석준 (한국과학기술원 건설 및 환경공학과) ;
  • 조계춘 (한국과학기술원 건설 및 환경공학과)
  • Received : 2019.09.23
  • Accepted : 2019.10.19
  • Published : 2019.11.30

Abstract

A great interest in the seismic performance evaluation of small size tunnel structures such as utility tunnel has been taken since recent earthquakes at Pohang and Gyeongju in Korea. In this study, the three-dimensional dynamic analyses of vertical shaft and horizontal tunnel under seismic load were carried out using FLAC3D. Especially, parametric analyses was performed to investigate the effects of interfacial stiffness on interfacial behavior between soil and structure. The parametric analysis showed that the interfacial stiffness scarcely gave an effect on the global dynamic behavior of the structure, while had a significant effect on the local displacement behavior of the connections. The magnitude of the interfacial stiffness was inversely proportional to the displacement, while the magnitude of interface stiffness was proportional to the normal and shear stresses. The results of this study suggest the limitations of the existing empirical equations for interfacial stiffness and emphasize the need to develop new interfacial stiffness models.

최근 발생한 포항과 경주 지진 이후 공동구와 같은 소단면 터널 구조물에 대한 내진 성능 평가에 대한 관심이 증가하고 있다. 이 연구에서는 유한 차분법 기반의 FLAC3D를 사용하여 지진 하중에 대한 수직구와 수평 터널 구조물에 대한 3차원 동적 해석을 수행하였다. 특히 지반과 구조물 사이 경계면 특성을 고려한 지반-구조물 상호 해석 시 중요 인자인 경계면 강성 계수의 영향을 분석하기 위한 매개변수 해석을 수행하였다. 매개변수 해석을 통해 경계면 강성 계수는 지하 구조물의 전체 동적 거동에는 큰 영향을 미치지 않지만 접속부의 국부적인 변위 거동에는 큰 영향을 미치는 것을 확인 할 수 있었다. 경계면 강성계수의 크기는 접속부에서의 변위와 반비례하는 경향을 보였으며, 수직 응력 및 전단 응력에 대해서는 비례하는 경향을 확인하였다. 연구 결과 수치 해석에서 주로 사용되고 있는 경계면 강성 계수에 대한 경험적 식의 한계를 제시할 수 있었으며, 새로운 경계면 강성 계수 모델 개발의 필요성을 확인하였다.

Keywords

Acknowledgement

Grant : 도심지 소단면(ø3.5 m급) 터널식 공 동구 설계 및 시공 핵심기술 개발

Supported by : 국토교통부

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