Characteristics of Stress-wave Induced Fractures in Controlled Laboratory-scale Blasting Ezperiments
Laboratory-scale blasting tests have been conducted with 15 cm diameter core samples of Barre granite to study shock wave-induced fractures in rock. These were designed to confine the explosion gases within the borehole so that the crack network created in the target rock was strictly due to the shock/stress waves. This was accomplished by inserting a tightfitting copper tube into the central borehole. Suitable combination of detonating cord (3g/m) and air coupling in 6 mm and 10 mm diameter boreholes made it possible to generate reproducible fracture patterns without fragmenting the core samples. The variation of crack density and their dimensions have been accurately mapped as a function of distance from the charge hole.Such data are crucial to calibrating the current and future numerical models used to predict blast results.
blasting detonating cord crack patterns shock wave granite fracture imaging
B.Mohanty M.M.Dehghan Banadaki
Department of Civil Engineering and Lassonde Institute, University of Toronto, Toronto, Canada, M5S 1A4
国际会议
The Second Asian-Pacific Symposium on Blasting Techniques(第二届亚太地区爆破技术研讨会)
大连
英文
43-49
2009-07-01（万方平台首次上网日期，不代表论文的发表时间）