Prediction of Ground Condition Changes Ahead of Tunnel Face Using Three-Dimensional Absolute Displacement Analysis

터널 3차원 절대변위 해석기법을 이용한 막장전방지반 예측

  • 방준호 (SK건설(주) 기술본부 연구소) ;
  • 한일영 (SK건설(주) 기술본부 연구소)
  • Published : 2006.06.30

Abstract

Arching effect occurs around the unsupported excavation surface near to tunnel face when a tunnel is excavated in a stable rock mass. If a weak fracture zone exists in front of tunnel face, a displacement occurs between tunnel face and weak fracture zone due to stress concentration. If three-dimensional absolute coordinates (longitudinal, transverse, vertical direction) is measured at tunnel face by geodetic method, the ground change in front of the tunnel face can be predicted by analysing three-dimensional absolute displacement. The purpose of this study is to verify the analysis method of three-dimensional absolute displacement by comparing the trend of displacement ratio at crown and sidewall of tunnel and the influence line/trend line of crown settlement compared with TSP results in the same section.

Acknowledgement

Supported by : 한국건설교통기술평가원