Rock mass damage due to blasting (BID) is important for the personnel working underground and also for rock reinforcement costs. Therefore, about 20 methods for damage assessment have been developed. The methods are shortly presented. Often several methods have to be used in combination to achieve good quantitative estimate of the damage. Some blast damage indices have been developed and one of them, the Dib (Yu & Vongpaisal 1996) after a modification of the Index was tested in field with good result. The ultrasonic method used both in lab and field tests has limited value and can only used with good accuracy to a depth of ~0.5 m. This method is not therefore recommended for blast damage measurements where damage depth could be up to 2.5 m.
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Raina et al. (2000) studied this question.