Blasting JSC Gaiskiy GOK

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Uploaded: 16.06.2016
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The thesis presents a new scientifically based decision tasks to improve the technology blasting during mining chamber system with a bookmark, which allows to increase the efficiency of drilling and blasting operations during the mining of the reserves cameras secondary queues.
The main scientific and practical results of the work are as follows:
1. It is established that the ore array of cameras second and subsequent queue represents the technogenic changed part of the working out of the array, a characteristic feature of which is the presence of a large number of cracks that weaken load-bearing elements of the development system. Analysis of calculation methods and theories of the mechanism of explosive destruction shows that the blasting disturbed areas of the array parameters of drilling and blasting can be defined from the point of view of the seismic impact of the explosion. The mechanism of explosive destruction of fractured rocks takes into account the wave nature of the process of destruction, the dynamic strength characteristics and properties of fractured array, and allows to determine the necessary for its destruction, the amount of explosives.
2. Studies the regularities of the effect of the width, the type of filler and amount of cracks on the rate of passage of longitudinal waves in the array. Changing the speed of passage of longitudinal waves is not dependent on the type of filler and the crack opening under other equal conditions remains dependent on size alone.
3. Energy saturation of the array is evaluated by the developed algorithm for determining parameter is equivalent to the given distance, reflecting the law of similarity. Studies have shown that when
increasing the distance between the charges 0.5 m equivalent to a given distance increases by 3-6%; the increase in the distance from the free surface to 0.5 m leads to an increase of the Se at 10-17%. The location of the charges for the blasting fractured the array in this case would be the interaction between explosion load between charges, ensuring the separation of the required volume of ore array, and the increase in LNS, leading to the decrease of saturation, and the resulting fragmentation will be characterized by degree of fracturing.
4. Identified according to the definition of the seismic characteristics of the explosion of the explosive charge determine the speed of displacement under compressive and tensile stresses depending on the distance. The distance for implementation of critical deformation to determine the parameters of the charge location and the conditions of destruction of the array.
5. The results of calculation of parameters of location charges for different categories of fracture of rocks and diameters of the charge showed that the grid placement of the charges in the breaking of arrays of smaller structural size can be increased. The coefficient of convergence in the rocks of category III and below, can take a value of 1.3-1.5, the distance between the charges and the line of least resistance for wells with a diameter of 110 mm relative to the diameter 89 mm in average increased by 20 and 15%, respectively. Reducing the saturation of explosive destruction, while ensuring the required quality of fragmentation is most efficiently implemented by reducing the diameter of the charge and application nezarazene delineation wells along the contour of the extraction chambers.
6. Developed and tested technological schemes and parameters of blasting allow you to get better ore fragmentation (the average size of the broken piece fell by 150 mm), reducing output oversized pieces (10%>) and the reduction of the clogging ore bookmarked (more than 10%). The implemented solutions allow to obtain an economic effect on the sewage works in the amount 11,17 tonne for Gaisky underground mine. Annual effect is 16.97 million RUB

Additional information

The total cost of drilling wells.
Drilling rig and diameter of Consumables, $ /1 p. m fee Earned driller, RUB/1 p. m shock absorpt
tional contributions, rubles/1 p. m total, RUB/1 p. m
SOLO 89 mm 46,07 of 15.91 42,59 104,58
105 mm 122,41 180,92
NKR-100 M 105 mm 127,3 85,86 17,95 231,08
110 mm 86,26 231,48

Savings in the drilling of one meter bore diameter of 89 mm compared with the diameter 105 mm installation "SOLO" is 76,34 RUB For the conditions of Gaisky underground mine, where the output of ore from 1 meter borehole in average 20 tons of cost saving when switching to a smaller diameter wells will be an average of 3.5 rubles per 1 ton of redeemable stocks.
Costs associated with the breaking of reserves will depend on the consumption of explosive substances and materials on m3 repulsed stocks. The specific consumption of EXPLOSIVES is determined by the actual number of loading wells (table. 6.6).


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