BLASPA    B L A S t i n g   P A t t e r n s  Blast Simulators for the Mining, Construction & Explosive industry
Blaspa Flyrock Simulators
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Blaspa includes simulators which make it possible to evaluate the flyrock for a given blast method in a given rock.  A simulation calculates the range and altitude of each fragment of rock projected from the free surfaces of the rock mass being blasted, and informs the user of the maximum values of these ranges and altitudes.

There are three simulators which deal with a bench blast, and one simulator which deals with a blast to open a cut (e. g. to blast a ramp, or a tunnel round).

 Bench blast

A simulation calculates the range and altitude of each fragment of rock projected from the top free face of the bench and from the vertical free face of the bench, and informs the user of the maximum values of these ranges and altitudes.  The user can obtain these maximum values for any one of three cases, as follows: (1) the front row of the bench (simulator called Maximum Flyrock from Top and Face); (2) a back row of the bench (simulator called Maximum Flyrock from Back Row); (3) the vertical face of the front row, the top of the bench being covered with a net to stop flyrock (simulator called Maximum Flyrock from Face Only-Net on Top).  For more information on any one of these simulators, click according to your choice:

 Blast to open a cut

This simulator (Flyrock Maximum Open Cut) calculates the range and altitude of each fragment of rock projected from the horizontal free face around the top of a vertical blast hole during an open cut blast, and informs the user of the maximum values of these ranges and altitudes.  The user can obtain these maximum ranges and altitudes for a ‘plug’ hole, or for a hole further from the center of the initiation.

This simulator is useful to evaluate the risk of hazardous flyrock during the excavation of a ramp, or if during a bench blast the horizontal movement of the rock is inadequate to prevent excessive upward swell of the rock of a back row of the bench (Note: see the other simulators explained below to learn how to remedy the problem of inadequate horizontal rock movement to prevent excessive upward swell of the rock of a back row of the bench).  For more information on this simulator, click:

Note

The simulators < Flyrock Maximum Bench> and <Flyrock Maximum Open Cut> do not simulate a ‘canon’ type rock projection, i. e. one where the explosion gases push directly and in concentrated fashion on a single slab of rock.  A ‘canon’ type rock projection is exceedingly rare; it can be simulated on request, if the detailed structure of the open joints in the rock mass is known.  The person responsible for the blasting must avoid a ‘canon’ type rock projection by recognizing the joint conditions likely to create such projections.