Blast safety distance, also known as the minimum separation distance, refers to the minimum distance between the explosive charge and related objects in an explosive operation. In other words, it is to determine the minimum distance between the blasting source and the protected target by theoretic or field experiments, so as to ensure the safety of the protected target in the static state without detonation.
Blast safety distance is a very important element in blasting operations, because improper control of blast safety distance will lead to safety accidents caused by blast shock wave and air overpressure. In order to prevent accidents from happening and ensure the safety of personnel and objects, maintaining a certain distance between the charge and exposed personnel and objects is very important.
The factors that affect the blast safety distance, in addition to the intensity of the explosive charge, also include environmental protection, geological factors and type of protection target. Generally, the closer the protection object is to the blasting source, the greater the risk and the greater the safety distance required. In order to determine the safety distance of a particular explosive, experiments or calculations based on a set of specific conditions need to be carried out in advance.
In order to determine a reasonable blast safety distance, engineers need to conduct theoretical calculations and experiments to test. Generally speaking, the calculation of the blast safety distance includes two methods, namely theoretical calculation and empirical formula calculation. The calculation of the blast safety distance by theoretical calculation is based on the theory of fluid mechanics, the theory of detonation wave propagation and so on. On the basis of the empirical formula calculation, it is necessary to analyze the field experiments and give the blast safety distance accordingly.
In addition, in the control of blast safety distance, the measurement of blast effect parameters by short distance monitoring system should also be done before blasting. This is to ensure that the actual situation is close to the calculated parameters, so as to avoid the risk of blasting safety accidents.
Therefore, the control of blasting safety distance plays a very important role in the blasting operation, and its scientific determination and control measures can ensure the safety of blasting personnel and construction.
