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2019 Vol.21, Issue 6 Preview Page

Research Paper

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

Jung-Tae Kim1
,
Eun-Soo Hong2
,
Seok-Jun Kang1
,
Gye-Chun Cho3*
김 정태1
,
홍 은수2
,
강 석준1
,
조 계춘3*
1Ph.D. Student, Dept. of Civil and Environmental Engineering, KAIST
2Research Professor, Dept. of Civil and Environmental Engineering, Kongju National University
3Professor, Dept. of Civil and Environmental Engineering, KAIST
1학생회원, 한국과학기술원 건설 및 환경공학과 박사과정
2정회원, 국립공주대학교 건설환경공학부 토목환경공학전공 계약교수
3정회원, 한국과학기술원 건설 및 환경공학과 교수
* Corresponding Author
30 November 2019. pp. 861-874
PDF XML Citation
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.

Keywords
Numerical analysis
Dynamic behavior
Vertical shaft-tunnel connection
Soil-structure interaction
Interface stiffness

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 강성 계수의 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.

키워드
수치해석
동적 거동
수직구-터널 접속부
지반 구조물 상호작용
경계면 강성 계수
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 21
  • No :6
  • Pages :861-874
  • Received Date : 2019-09-23
  • Revised Date : 2019-10-08
  • Accepted Date : 2019-10-19
  • DOI :https://doi.org/10.9711/KTAJ.2019.21.6.861
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