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Consideration on local blast vibration control by delay blasting
University of Tokyo, School of Engineering, Department of Geosystem Engineering.
Mitsui Mining and Smelting Co.
University of Tokyo, School of Engineering, Department of Geosystem Engineering.
University of Tokyo, School of Engineering, Department of Geosystem Engineering.
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1999 (English)In: Kayaku-gakkaishi, ISSN 1340-2781, Vol. 60, no 5, p. 238-239Article in journal (Refereed) Published
Abstract [en]

In this research, local blast vibration control based on the theory of superposition of waves was investigated. Firstly, the influence of delay time errors of conventional electric detonators upon the level of local blast vibration was examined. Secondly, for a further effective local blast vibration control, a new delay blasting design concept "combined delay blasting" that postulates the use of electronic detonators, which virtually have no delay time errors, is proposed. For a delay blasting with uniform detonation time intervals, an optimum time interval to minimize the local PPV (Peak Particle Velocity) is obtained based on the relationship between the PPV and the time interval, which is derived by superposing identical vibration time histories of each single hole shot. However, due to the scattering of the actual delay time caused by errors, PPV of a production blast seldom coincides with the estimated one. Since the expected value and the variance of PPV mainly depend on sensitivity of PPV around the nominal delay time, it is proposed that not only the optimum but also several sub-optimum candidates of delay time should be examined taking error into consideration. Concerning the "combined delay blasting", its concept and some simulation results are presented. The estimated reduction effect of blast vibration of a delay blast based on this concept was quite favorable, indicating a possibility for further effective local blast vibration control.

Place, publisher, year, edition, pages
1999. Vol. 60, no 5, p. 238-239
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-5687Local ID: 3da305e0-2b47-11de-adf6-000ea68e967bOAI: oai:DiVA.org:ltu-5687DiVA: diva2:978561
Note
Godkänd; 1999; 20090417 (andbra)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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