Rock drilling and blasting parameters
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( 1 ) The location of the rock drilling patio. The principle of the arrangement of the rock drilling patio is: The rocking radiation point should be on the contact line between the ore body and the surrounding rock of the lower plate, so that after the blasting of the blasthole, neither the residual ore remains in the lower plate nor the lower rock, and the bottom plate is smooth and flat. To this end, when arranging the blasthole, the blasthole next to the surrounding rock of the lower plate should be in contact with the lower plate and be located in the ore body.
( 2 ) A piece of collapse. The amount of a piece of collapsing is determined by the volume of the ore roadway and the ore roadway. The ore that can be collapsed at a time can be completely accommodated by the ore and mine roadway. When the ore is discharged, it can be completely released, and the ore will not be piled up in the lower plate. When the mine collapses, the ore falls into the mine roadway.
( 3 ) The direction of the minimum resistance line. It is necessary to face the mine roadway and make full use of the explosive force generated during the collapse of the mine to cause the ore to be thrown into the mine roadway.
( 4 ) When multiple rows are detonated, the delay between row and row is delayed. The delay time between the row and the row, to ensure that the ore in the back row will not hit the front row of the blasted ore in the middle of the throwing and will fall on the bottom plate of the lower plate, and the rolling will not be affected by the mine roadway, according to the use. The practice of exploding the mining method of the mining method proves that the delay time between the row and the row is preferably 50~100ms .
( 5 ) The unit consumption of explosives. The factors affecting the single-consumption consumption of explosives and explosives are: ore body inclination and thickness, throwing distance, ore blasting and explosive type. Generally speaking, the explosive consumption of explosives is lower than that of non-explosive force. It takes about 30% more to move , and the amount of explosives that can be used is determined.