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When a bench
blast takes place, there are three values of the delay
between rows which influence significantly on the
quality of the blast results; they are (1) the Minimum
Delay; (2) the Optimum Delay (or DSB Delay) to give
the best fragmentation of the rock; and (3) the
Necessary Delay required in order to create sufficient
horizontal swell to move the rock of a back row
adequately to prevent too much upward movement and
flyrock.
Blaspa includes simulators
which allow the evaluation of each of these types of
delays for a given blast method in a given rock type.
A simulation can calculate the appropriate value of
the delay, in millisec,
for each case.
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Minimum Delay < Shock Wave Stress and Displacement > |
The value of the
Minimum Delay is evaluated with the simulator which
calculates the speed of the fragmentation front
created inside the rock mass during a blast; presently
this value is available to the user when he runs the
simulator < Shock Wave Stress and
Displacement >. For more information on the
use of this simulator to evaluate the Minimum Delay,
click:
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Optimum Delay < Shock Wave Stress and
Displacement > |
The value of the
Optimum Delay is evaluated with the simulator which
calculates the velocity of the rock movement at the
face of the bench; presently this value is available
to the user when he runs the simulator
< Shock Wave Stress and
Displacement >. For more information on the
use of this simulator to evaluate the Optimum Delay,
click:
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