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为了减少排间微差齐发爆破的有害影响,加斯佩矿山分公司采用了孔间微差顺序爆破法。为改进这种方法分三步进行了试验:把炮孔的矩形排列改为方形排列、加大边孔的填塞长度和试验排间延时间隔从35毫秒延长到50毫秒。试验结果表明,由于有增加残炮数量的可能性,所以排间微差齐发爆破方法的改进有一定限度。在采用孔间微差顺序爆破法以前,对原用方法的种种改进可以确定改进爆破的总途径,包括:规划开采顺序,监督每次爆破的穿孔、装药和连线,汇集和评价爆破结果,逐个台阶对比爆破结果并坚持每次爆破都做一次改变。通过这样一种途径可成功地分两步采用孔间微差顺序爆破法:进行排间延时起爆试验和排内孔间延时起爆试验。用高速摄影和计算机模拟爆破分析了最优结果。用CORDLINE起爆系统获得了实际的最优顺序爆破,用了系统中的15段,可按排间延时间隔230毫秒和排内孔间延时间隔50毫秒进行大量炮孔的顺序爆破。在推行孔间微差顺序爆破的同时,仔细研究了穿爆成本。结果表明,每吨矿石的穿孔成本有显著降低。尽管卷装浆状炸药的使用量增加了,但每吨矿石的爆破成本却有所降低。每吨矿石穿爆成本降低的原因可解释为:在平均单位炸药消耗量不变的情况下,孔网尺寸扩大了。加斯佩矿山公司成功地使用孔间微差顺序爆破法,提高了爆破质量,而且有助于提高劳动生产率和最大限度地降低穿爆成本。
In order to reduce the harmful effects of differential blasting, Gaspar Mine Branch adopted a series of microprojection sequence blasting. In order to improve this method, the experiment was carried out in three steps: the rectangular arrangement of the bores was changed to a square arrangement, the padding length of the enlarged bores and the delay interval between the test rows were extended from 35 milliseconds to 50 milliseconds. The test results show that due to the increased number of residual guns, the improvement of the method of row-wise differential blasting has a certain limit. Prior to the application of the microtunnel blasting method, improvements to the original method were used to determine the overall route for improved blasting, including planning the sequence of mining, monitoring the perforation, charging and connection of each blasting, pooling and evaluating the blasting results , Step by step blasting results and insisted that each blasting done a change. Through such a method, the micropore blasting method between holes can be successfully used in two steps: the time delay detonation test and the time delay detonation test within the row are carried out. The best results were analyzed by high-speed photography and computer simulation of blasting. Using CORDLINE detonation system to obtain the actual optimal sequence blasting, with the 15 sections in the system, a large number of blasting blasting can be carried out according to the interval of 230 milliseconds and the lapse interval of 50 milliseconds. In the implementation of microporous blasting between the order of the same time, careful study of the cost of wearing explosion. The results show that per ton of ore perforation costs have dropped significantly. Despite the increased use of package slurry explosives, blasting costs per ton of ore have decreased. The reason for the reduction in cost per ton of ores can be explained by the fact that the pore size is enlarged with an average unit consumption of explosives. Gaspe Mining has successfully used microprojectile blasting to increase the quality of the blasting, as well as helping to increase labor productivity and minimize blasting costs.