Prediction of Rock Mass Strength Ahead of Tunnel Face Using Hydraulic Drilling Data

천공데이터를 이용한 터널 굴진면 전방 암반강도 예측

  • 김광염 (한국건설기술연구원 기반시설연구본부) ;
  • 김성권 (한국건설기술연구원 기반시설연구본부) ;
  • 김창용 (한국건설기술연구원 기반시설연구본부) ;
  • 김광식 (한국건설기술연구원 기반시설연구본부)
  • Published : 2009.12.31

Abstract

Appropriate investigation of ground condition near excavation face in tunnelling is an inevitable process for safe and economical construction. In this study mechanical parameters from drilling process for blasting were investigated for the purpose of predicting the ground condition, especially rock mass strength, ahead of tunnel face. Rock mass strength is one of the most important factors for classification of rock mass and making a decision of support type in underground construction. Several rock specimens which are considered homogeneous and having different strength values respectively were tested by hydraulic drill machines generally used. As a result, penetration rate is fairly related with rock mass strength among drilling parameters. It is also found that penetration rate increases along with the higher impact pressure even under same rock strength condition. It is finally suggested that new prediction method for rock mass strength using percussive pressure and penetration rate during drilling work can be utilized well in construction site.

Keywords

Ahead of tunnel face;Drilling data;Penetration rate;Prediction of rock mass strength

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