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2021 Vol.23, Issue 2

Research Paper

Numerical sensitivity analysis for the reinforcement effect of a curvature of a tunnel floor on soft grounds

연약지반에 위치한 터널 바닥부 곡률의 보강효과에 대한 수치해석적 민감도 분석

Kwang-Ho You1*
유 광호1*
1Professor, Dept. of Civil and Environmental Engineering, University of Suwon
1정회원, 수원대학교 건설환경공학과 교수
*Corresponding Author
31 March 2021. pp. 61-76
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Abstract

As the number of existing road tunnels increases every year, collapse and floor heaving accidents occur frequently during construction. The collapse among tunnel accidents dominates, so that studies related to the floor heaving are relatively insufficient. Accordingly, many studies to reinforce the lower part of the tunnel have been conducted, but the analysis on the effect of the curvature of the tunnel floor is insufficient. Therefore, in this study, the effects of the upper analysis area height and the coefficient of lateral earth pressure of the tunnel located on a tuff deterioration zone with a large rock cover, as well as the floor curvature, were examined through sensitivity analysis. As a result of the analysis, it turned out that the overall stability of the tunnel increases as the floor curvature increases, the coefficient of lateral earth pressure decreases, and the upper analysis region increases.

Keywords
Curvature of tunnel floor
Tuff deterioration zone
Coefficient of lateral earth pressure
Height of analysis area above a tunnel

매년 기존 도로 터널의 개소 및 연장이 증가하는 만큼 시공 중 붕락 및 융기사고가 빈번하게 발생하고 있다. 터널 사고 중 붕괴가 주를 이루어 상대적으로 융기와 관련된 연구가 미흡한 상태이다. 이에 터널 하부를 보강하는 많은 연구가 진행되어 오고 있으나, 터널 바닥부 곡률에 대한 분석이 부족한 실정이다. 따라서 본 연구에서는 바닥부 곡률은 물론이고, 토피가 큰 응회암 변질대에 위치한 터널의 상부 해석영역 높이 및 측압계수가 안정성에 미치는 영향을 민감도 분석을 통해 살펴보았다. 해석 결과 전반적으로 바닥부 곡률이 커질수록, 측압계수가 작을수록, 상부 해석영역이 높을수록 터널의 안정성이 증가하는 것으로 나타났다.

키워드
터널 바닥부 곡률
응회암 변질대
측압계수
터널 상부 해석영역 높이
References
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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 : 23
  • No :2
  • Pages :61-76
  • Received Date : 2020-12-09
  • Revised Date : 2021-03-08
  • Accepted Date : 2021-03-08
  • DOI :https://doi.org/10.9711/KTAJ.2021.23.2.061
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