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Experimental study on blasting performance of water soil composite plugging in underground mines

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Document pages: 11 pages

Abstract: In the large diameter deep hole cut blasting of underground mine, in order to prevent the explosive energy from escaping from the upper part of the blast hole, the top blocking must be carried out. The commonly used single mud blockage often leads to material blockage, which reduces the blasting efficiency. To solve this problem, a new water-soil composite plugging method is proposed. A series of small-scale tests were carried out on solid concrete blocks to study the effects of top blocking material and blocking length on blasting performance. The test results show that the effect of water plugging is worse than that of single soil with the same length in improving the utilization rate of explosion energy. In addition, the average fragment size decreases with the increase of Incease of stemming length for single water stemming. Three schemes of water-soil composite stemming were designed and the scheme with soil in the lower part and water filled in bags in the higher part had the best fragmentation. The water-soil composite stemming was applied in underground stopes, and field results indicated that the newly proposed stemming led to similar rock fragmentation with traditional single soil stemming, but greatly reduced the clogged blast hole ratio, thus effectively improving blasting and mining efficiency.

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