2014, Volume 16, Issue 11
Strategic Study of CAE >> 2014, Volume 16, Issue 11
A new method of rock-explosive matching in drilling and blasting based on reasonable control of the crushed zone
1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan 430072，China；
2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education，Wuhan University，Wuhan 430072，China
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Abstract
Reasonable rock-explosive matching is of great important to the enhancing of explosive energy effective utilization and the improving of rock fragmentation effect. The traditionally emphasized method of acoustic impedance matching is not reasonable. Starting from the blasting breakage mechanism, a new method of rock-explosive matching in drilling and blasting is proposed. The new approach chooses explosive parameters by reasonable control of the size of crushed zone under the condition of fully fragmentation between adjacent balstholes. This method can intuitively reflect the blasting fragmentation effect and energy effective utilization, which is easy to implement. Also, a modified model is developed, with the combination of adjacent blastholes explosion load taken into account. As a result, explosive parameters for different grades of rock are given in full coupling on-site mixed explosive charge under different project objectives.
Keywords
drilling and blasting ; crushed zone ; rock-explosive matching ; acoustic impedance matching
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References
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