ONE-TIME WELL FORMATION TECHNOLOGY OF DEEP HOLE BLASTING IN CRUSHED ORE BODY
Traditional methods such as manual excavation were originally used in the construction of stope cutting shafts in Zhongguan iron mine,but this method has many drawbacks such as low safety factor,poor working place environment,high labor intensity and low efficiency.With the development and improvement of mining technology,the blasting method has been widely used because of its high safety,fast well formation speed,high efficiency and economic practicability.In order to improve the construction efficiency of the cutting shaft of Zhongguan Iron Mine and reduce the cost of tunneling,according to the actual situation of Zhongguan Iron Mine,a one-time well completion plan for medium and deep hole blasting was formulated.By studying the deep hole grooving and blasting mechanism,to ensure that there is enough compensation space in the blasting process;the charge hole and the empty hole are arranged in a cross"square",a total of 23,of which,13 charge holes and 10 empty holes,the hole diameter and delay time are set for different types of holes,and the rationality of the hole layout mode is verified by the calculation of the compensation coefficient;at the same time,according to the roadway blasting hazard management regulations,the optimal blasting charge is determined,and finally the cutting well is blasted into a well.The practical application in the field shows that the one-time well formation technology of medium and deep hole blasting has good applicability in Zhongguan Iron Mine,which improves the speed and quality of cutting shafts,reduces potential construction safety hazards,ensures the safety of mine production,and provides a reference for similar cutting shaft blasting projects.
cutting wellsmedium and deep holesprimary blastingblast hole arrangementblasting charge
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