Structural blast vibration limits should be based on the strength of the structure,the stress induced by blasting,and a responsible factor of safety.In this article,a methodology that uses direct strain measurements to determine the stress induced by blasting is described.The methodology has been used to measure strain resulting from blasting and establish appropriate blast vibration limits on a brick sewer tunnel,an underground mine heading,brick veneer houses,a water pipeline,and transmission tower foundations.An outline is given of the use of the methodology to establish limits for the main entry heading of an underground coal mine,and transmission tower footings.The methodology that is described has reduced uncertainty factors and permitted the specification of higher blast vibration limits than had been previously used.
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