Estimation of Total Displacements by RMR Grades using 3-Dimensional Numerical Analysis

3D 수치해석을 이용한 퇴적암 터널의 암반 등급별 전변위 산정

  • Yim, Sung-Bin (Department of Earth & Environmental Sciences, Chungbuk National University) ;
  • Yun, Hyun-Seok (Department of Earth & Environmental Sciences, Chungbuk National University) ;
  • Seo, Yong-Seok (Department of Earth & Environmental Sciences, Chungbuk National University) ;
  • Park, Si-Hyun (Korea Infrastructure Safety & Technology Corporation, Underground Facility Dept.)
  • 임성빈 (충북대학교 지구환경과학과) ;
  • 윤현석 (충북대학교 지구환경과학과) ;
  • 서용석 (충북대학교 지구환경과학과) ;
  • 박시현 (한국시설안전기술공단 지하시설실)
  • Published : 2007.06.30

Abstract

Tunnel displacement happens during the process of stress redistribution by tunnelling. Tunnel displacement can be divided into 3 types such as displacements occurring before excavation, non-measured displacements after excavation and measured displacements after excavation. Because measurements of displacements occurring before excavation and non-measured displacement after excavation are difficult and time-consuming in the field, many researchers have studied on total displacement and its characteristics with excavation using numerical analysis. In this study, we used a 3-D back analysis to estimate total displacement by rock mass grades in tunnel constructed in sedimentary rock. We reduced error between measured displacements and calculated displacements from a 3-D numerical analysis, and then estimated suitable rock mass properties by RMR classes. Ultimately, Logistic nonlinear regressions of total displacement with tunnelling were estimated by least square estimation.

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