A New Quantification Method of Rock Joint Roughness (II) - Roughness classification and strength equation -

암석 절리면 거칠기의 정량화에 대한 연구(II) - 거칠기의 구분과 강도식의 제안 -

  • 홍은수 (한국지질자원연구원 지반안전연구부 지하공간연구실) ;
  • 조계춘 (한국과학기술원 건설 및 환경공학과) ;
  • 권태혁 (한국과학기술원 건설 및 환경공학과) ;
  • 이인모 (고려대학교 사회환경시스템공학과)
  • Published : 2006.06.30

Abstract

Rock joint roughness obtained from the camera-type 3D scanner was classified into waviness and unevenness. The classification criteria were established in the previous study; digital filtering was used to distinguish one from another. The classified and original profiles were used to produce metal moulds. For accurate machining of the moulds, the WEDM(Wire-cut Electric Discharge Machining) was adopted. Specimens were cast using high strength gypsum, and joint shear tests were performed by varying normal stress from low value to high one. Roughness mobilization characteristics depending on the asperity scale and the applied normal stress were investigated. A new equation was proposed to predict shear strength of rock joint, which can consider the characteristics of roughness mobilization and roughness parameters. The roughness quantification composed of waviness and unevenness was found to be a useful method to predict the joint shear strength.

Acknowledgement

Supported by : 한국건설교통기술평가원