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Assessment of Notch Effect on Fracture Plane Control  

Kim, Kwang-Yeom (한국건설기술연구원 지하구조물연구실)
Kim, Dong-Gyou (한국건설기술연구원 지하구조물연구실)
Jeong, Dong-Ho (유신코퍼레이션 지반.터널 2부)
Cho, Sang-Ho (전북대학교 자원.에너지공학과)
Publication Information
Explosives and Blasting / v.26, no.1, 2008 , pp. 57-66 More about this Journal
Abstract
It has been proven that the pre-cracking notches in a blasting hole are applicable to control crack growth along specific direction. This study compared the roughnesses of the fracture plane resulting from test blasts using a regular charge hole and notched charge hole to investigate the effect of the notches of charge hole on the formation of fracture plane. A notch bit system was used to drill the notched hole in the rock specimens. The surfaces of the fracture planes were reconstructed as Digital Elevation Model (DEM) using digital photogrammetric method and the roughnesses of the surfaces were estimated with Surface Roughness Profile Index (SRp).
Keywords
Notch; Roughness; DEM; Digital photogrammetry;
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