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2014 Vol.16, Issue 1 Preview Page
Sensitivity analysis of tunnel stability with a consideration of an excavation damaged zone

암반손상대를 고려한 터널 안정성 민감도 분석

Jin-Soo Kim1
,
Sanki Kwon2*
김 진수1
,
권 상기2*
1Graduate Student, Department of Energy Resources Engineering, Inha University
2Professor, Department of Energy Resources Engineering, Inha University
1인하대학교 에너지자원공학과 석사과정
2인하대학교 에너지자원공학과 교수
*교신저자. *Corresponding Author. 
31 January 2014. pp. 91-104
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Abstract

An Excavation Damaged Zone (EDZ), in which rock properties are permanently changed due to blasting impact or stress redistribution, can influence the behavior and stability of structures. In this study, the mechanical stability of an underground opening was simulated by using FLAC, which is a two-dimensional modeling code, with a consideration of EDZ. A sensitivity analysis was also carried out with fractional factorial design. From the modeling, it was found that the behavior and the stability of an underground tunnel are strongly dependent on the existence of the EDZ. The sensitivity analysis showed that the key parameters affecting the factor of safety around the tunnel are in-situ stress ratio, depth, cohesion, reduction ratio, internal friction angle, and height and width of the tunnel. It is necessary to consider the EDZ, which can significantly affect mechanical stability in tunnel design.

Keywords
Tunnel analysis
EDZ
FLAC
Design of experiment
Sensitivity analysis
Fractional factorial design

발파충격 또는 응력재분배에 의해 발생하는 암반손상대(Excavation Damaged Zone, EDZ)는 암반의 여러 물성들을 변화시킴으로써 구조물의 거동과 안정성에 영향을 미치게 된다. 본 연구에서는 EDZ를 고려한 터널에 대한 2차원 연속체 해석 코드인 FLAC을 이용하여 역학적 안정성을 해석하고 안정성에 관련된 인자들을 대상으로 부분요인설계법(Fractional Factorial Design)을 이용한 민감도 분석을 실시하였다. 모델링 결과 터널 주변의 거동과 안전율은 손상대 유·무에 따라 많은 차이가 있었다. 민감도 분석 결과 터널주변의 안전율에 많은 영향을 미치는 인자는 측압계수와 심도, 점착력, 물성 감소비, 터널의 폭, 내부 마찰각, 터널의 높이 순이었다. EDZ는 터널 주변의 역학적 안전성에 많은 영향을 미칠 수 있기 때문에 터널 설계 시 고려하는 것이 필요하다.

키워드
터널 해석
암반손상대
FLAC
실험계획법
민감도 분석
부분요인설계법
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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 : 16
  • No :1
  • Pages :91-104
  • Received Date : 2014-01-13
  • Revised Date : 2014-01-23
  • Accepted Date : 2014-01-27
  • DOI :https://doi.org/10.9711/KTAJ.2014.16.1.091
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