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 Blaspa Shock Wave & Displacement Simulators
 
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The leading page of these simulators allows the user to enter the parameters for the blasting method which he wishes to simulate; to do this he uses the input group fields <Bench Geometry>, <Rock>, <Explosives>, and <Costs> ; the inputs can be done in Imperial or Metric units.  He also has the choice to keep a record of his studies by using the group field <Study>.  Once his parameters have been entered, he can proceed to simulate the blast; selectable simulator options allows the choice of the different outputs available for the simulators <Shock Wave Stress and Displacement>, as the following paragraphs explain.

The link How to design a blast using the BLASPA simulator explains the mechanisms that take place in the rock mass during a blast.  The simulators <Shock Wave Stress and Displacement> are those which supply to the user the most information regarding what takes place in the rock during a blast, starting at the initiation till the rock mass bursts out.  Thus they allow the user to evaluate very many aspects of the quality of the blast results, and in particular to learn about the following aspects:

 
  Simulator <Shock Wave Stress>

This simulator calculates the contour of the shock wave stress created in the rock mass;  for a given bench blast procedure, the contour of your choice of shock wave stress level T is simulated and displayed graphically inside the bench.  For more information on this simulator, click:

   Simulator <Displacement> 

This simulator calculates the profile of the displacement of the rock mass at a given time after initiation, the value of this time being chosen by the user with the help of the slot <Time Wanted>.  For more information on this simulator, click:

   Option <Maximum Burden> 

This option allows the user to learn the value of the semi-static stress level SS imposed by the blast to the rock at the free face of the bench.  The value of SS, together with the shock wave stress contour, make it possible to predict the largest burden that can be excavated with the blast method under study.  For more information on this option, click:

   Option <Optimum Delay (DSB)> 

This option allows the user to learn the value of delay between rows which imposes the best fragmentation to the rock.  For a given bench blast procedure, the velocity of the rock at the face is simulated and the optimum delay is calculated using the well proven Dupont Sequential Blasting D. S. B. criterion.  This simulation also allows the delay to be calculated according to any other choice of criterion that the user may prefer.  For more information on this option, click:

   Option <Curve Position> 

This option allows the user to select the plane of the bench in which the shock wave stress contour and the displacement profile are simulated.  With the choice <X=0>, the graphs are in a plane perpendicular to the free face of the bench which traverses the blast hole; with <X=S/2>, S being the value of the Spacing, the graphs are in a plane perpendicular to the free face of the bench located half way between two holes.  For more information on this option, click:

   Option <Wall Control> 

The simulators explained to date assume that the horizontal top of the bench stretches reasonably far beyond the last row of the blast.  In construction, e. g. for the excavation of an electrical power plant, or in a mine, e. g. when the blasting approaches a final wall of the pit, some blasts are carried out near a final wall whose base is at the level of the top of the bench.  The option <Wall Control> allows the user to simulate the shock wave stress contours in the presence of such a wall.  For more information on this option, click:

   Option <Coal Control> 

This option is available for a user who wishes to simulate a blast to excavate the rock above a layer of coal.  This option allows the user either to optimize the excavation of the rock, or to control the damage to the coal.  For more information on this option, click:

 

Note:

The user has the choice to simulate with only one simulator at a time, or with several simulators and options simultaneously depending on the selected simulator options on the leading page of the simulators <Shock Wave Stress and Displacement>.

 
 
     
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