Blast optimization for the assessment of ground vibrations at Demirbilek panel of Tunçbilek mine

Arseven, Burak
Demirbilek village is located within the close neighbourhood of the Demirbilek open cast mine. The stripping operation at the mine is done by bench blasting. The blasting induced ground vibration already caused the structural damage in the buildings at the above mentioned village. Therefore, the control and minimization of ground vibrations constitutes the aim and the scope of this research work. The research work consisted of monitoring of vibration, characterising the seismic waves, determination of magnitude and frequency of the waves. Total number of vibration records are 102 for single hole blasts and 4 for round blasts. These studies were followed by a critical evaluation and proposals for new blast designs. The proposed blast designs were also validated by further monitoring. As a result the best blasting practice was selected and offered to control and minimize the ground vibrations. Findings of the study show that, to perform productive, time and cost saving blasting at least 30 to 50 Kg charge must be used per blasthole. Moreover, it is understood that at less than 100 m of absolute distances both single hole and round blasts cause cosmetic cracking on the structures. For more than 100 m of absolute distances, it is recommended to perform round blasts by using 60ms delay period to eliminate structural damage. Depending on the feet that the minimum amount of charge per hole is 30 kgs, the prevention of human disturbance is not possible for distances below 350 meters. It is understood that single hole blasts are not time and cost effective. Therefore, the use of round blasts with optimum delay time is recommended.


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Citation Formats
B. Arseven, “Blast optimization for the assessment of ground vibrations at Demirbilek panel of Tunçbilek mine ,” M.S. - Master of Science, Middle East Technical University, 2003.