A PROPOSAL ON THE BLAST VIBRATION CONTROL BASED ON PROBABILISTIC APPROACH

Blasting is usually used in tunnelling in mountainous region. Nowadays, however, controlled blasting is often used because of vibration or air blast by the blasting. We fundamentally estimate and control the blasting vibration by a survey of blasting test. For that purpose, we use the equation of PPV=KWaD-b where PPV is the peak particle velocity, D is the distance from the source and W is the sum of the instantaneously detonating charge. Because we consider that W is the charge within the same delay number in this equation, the reduction of vibration caused by a distribution of firing within the same delay number is not considered. Analyzing the blasting vibration records measured in a tunnelling in practice, we propose the blast vibration control method using probability theory which is based on the charge per each hole instead of the charge within the same delay number.