Abstract
The delay‐time of detonators in hole‐by‐hole blasting is generally calculated accurately considering they have great influence on the blasting effect, such as blasting vibration and blasting slungshot. The high‐precision nonel detonator and digital electronic detonator are been commonly used because of their accuracy of delay‐time. However, each detonator has an allowable error range of delay‐time due to the difference in manufacturing process. In the initiation network, the errors of delay‐time often accumulate gradually as the number of detonators increases. Therefore, theoretical delay‐time and actual delay‐time with error in the detonating network were discussed based on the delay‐time errors of detonators. The single‐factor variable method was used to carry out the comparative test in deep hole blasting. The results showed that the particle peak vibration velocity (PPV) was 13.1783 cm/s and 3.4856 cm/s with a drop of 73.55% in comparison with a nonel detonator and digital electronic detonator, which proved that hole‐by‐hole blasting in the high‐precision nonel detonator network was not achieved due to the delay error of detonators. Furthermore, the location distribution map of holes where the same section of detonators might occur was obtained. Finally, the probability of blasting in the same section changes with the number of blast holes was discovered by theoretical analysis, which provided a basis for accurate hole‐by‐hole blasting.
Highlights
Blasting is one of the most efficient methods for excavation in mines, hydropower projects, and tunnel
Different empirical formulae and prediction models were established to explore the relationship between charge weight per delay and peak particle velocity (PPV) based on blast-induced monitoring data [1,2,3,4]. e influence of geological conditions on blast vibration was revealed combining blasting tests and numerical simulation [5,6,7,8]
Blair [12] proved the influence of charge weight on blast vibration during surface blasting and underground blasting, which showed that the charge weight had a great impact on surface blasting but less on underground blasting
Summary
Blasting is one of the most efficient methods for excavation in mines, hydropower projects, and tunnel It brings some harmful effects, such as blast-induced vibration. Different empirical formulae and prediction models were established to explore the relationship between charge weight per delay and peak particle velocity (PPV) based on blast-induced monitoring data [1,2,3,4]. E former realize the delay-time through chemicals in detonators, and the latter use electronic chips. E delay errors of detonators would affect blastinduced vibration by changing the initiation time of blast hole. Is paper focuses on the influence of delay-time errors of detonators on blastinduced vibration thorough theoretical analysis and field experiments Few research studies concentrated on delaytime errors of detonators. is paper focuses on the influence of delay-time errors of detonators on blastinduced vibration thorough theoretical analysis and field experiments
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