Roy, M. P. and Paswan, Ranjit Kumar and Himanshu, Vivek Kumar and Ali, Firoj and Kumar, Suraj (2021) Effect of Accuracy in Timings of Delay Detonators on Intensity of Blast Induced Ground Vibration. The Indian Mining and Engineering Journals, 60 (12). pp. 68-72.

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Abstract

Ever-increasing demand of coal and metal have forced the mining industries to perform a big size blast in open pit and as well as in underground mines. In these circumstances, role of delay timings become very significant. In India, currently cord relays and MS connector with detonating fuse and Nonel delay detonators (shock tube) are very common. In recent time, electronic delay detonators have also been usen at large scale in open pit and underground metal mines. The delay-time accuracy in delay detonators play a very important role in controlling ground vibration as the calculation of maximum explosives weight per delays is mainly rely on this. In general, 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 have been discussed in this paper based on the delay-time errors of detonators. The comparative test of blast-induced vibration has also been carried out using the NONEL and electronic/digital delay detonator. The test results showed that the very good quality of Nonel/digital electronic detonator must be used while blasting in sensitive locations in order to control the vibration. In this paper, the actual firing time of different delay detonators were analysed at open pit Coal and Iron mines and at underground lead zinc mine. The impact of scattering in detonator timing on vibration and fragmentation has been analysed.

Item Type:	Article
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	03 Nov 2022 09:32
Last Modified:	03 Nov 2022 09:32
URI:	http://cimfr.csircentral.net/id/eprint/2542

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