Experimental Study of Blast‐Induced Vibration Characteristics Based on the Delay‐Time Errors of Detonator

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.

Experimental Study on Frequency Modulation Damping Effect of Digital Detonator in Road Clearance Blasting

“…Because the actual and the nominal delay of detonator have large discreteness [37][38][39], there is normally a delay error. Terefore, in the actual initiation process, a hole-by-hole initiation with a small delay time was adopted [40][41][42][43]. Te time settings of hole initiation sequence are shown in Figure 4.…”

Metoda zarządzania ryzykiem zawodowym dla robót strzałowych w odkrywkowym górnictwie skalnym w oparciu o zmodyfikowany algorytm FMECA

“…Current research work on blasting safety mainly focuses on the environmental impact of blasting. In the case of blast-induced ground vibrations research was done on prediction of intensity and modeling of ground-borne vibration phenomena [10,11,12,13,14,15], the effect of blast-induced vibrations on buildings and structures [16,17,18], and the influence of blasting technology on the seismic effect [19,20,21]. Considering airblast and flyrock, research was mostly made in prediction models of its intensity [22,23,24,25,26].…”

Arduino-Based Low-Cost Device for the Measurement of Detonation Times in Blasting Caps

“…If the detonation of a blast hole occurs at an instant far from its nominal value, overlapping or detonations outside the expected time can occur, with the appearance of adverse effects such as projections, vibrations, airwaves, poor fragmentation, poor blast performance, etc. [ 12 , 13 , 14 , 15 ]. Hence, it is crucial to know the actual instant of detonation of the detonators in order to study the accuracy of the initiation system and its influence on the blasting results.…”