Rock breakage using expls

In 1956, Duvall Atchison of USBurMines (Ref 1) developed an experimental technique for making quantitative measurements of the strain produced in a solid rock medium by the deton of an expl chge. This technique has been used to study the physical process of rode breakage. The studies have shown that the characteristics of the strain pulse produced in a rock by an expl determine die effectiveness in breaking rock. Thus, the strainmeasuring technique provides a direct method for measuring the relative effectiveness of different expls (Refs 1, 3 7)... 

---