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Development of Attenuation Relationships for Underground Blasts: Different Equations

Saha Dauji


Blasting operation becomes essential for excavation in weathered and hard rock strata for construction and mining activities. The Indian Standard and industrial practice of establishing the site specific attenuation relationship recommend Power form of relationship between the PPV the scaled distance with an exponent of 2/3 (IS) and 1/2 (industrial practice). In this paper, three different equation forms and five different exponents were explored for modelling the aforementioned relationship for a particular site. It was concluded that the universally popular Power model was among the best models for the aforementioned relationship followed closely by the Reciprocal model and the Weibull model, the last suffering from parsimony. Further, it was found that exponents other than the popularly used 1/2 or the IS recommended 2/3 might give better results. The IS code was found to yield conservative values of safe charge weight for a particular safe PPV for a certain distance.

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IS: 6922, Criteria for Safety and Design of Structures Subject to Underground Blasts, Bureau of Indian Standards, New Delhi, 1973 (reaffirmed 2003).

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