The mining industry is seriously concerned about the cost associated with blast damags in terms of safety and productivity of mines. As a consequence, improved control over blast damage to mining excavations has become an economic imperative. Ground vibrations are often considered an undesirable by-product of blasting. The "Peak Particle Velocity" (PPV) is often used as a means of predicting and/or assessing blast induced damage. A study was conducted by monitoring ground vibrations in underground development openings and also the review of the relevant literature. A vibration predictory model was developed for the test site. The predictory model was tested by blasting a round up to the baby arch holes only. By comparing the predicted and actual damage to the back holes, the burden and spacing for back holes were recommended. The interaction between the geological features and blast vibrations has been discussed and the effect of the jointing angle on the propagation of ground vibration was examined using small scale blasting experiments. The relationship between the critical PPV for 'Damage' and 'Fall off was also investigated.
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