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Based on the actual production in jilangde open pit coal mine, the application of air interval charging blasting technology was clarified, defining two test significance: one is “reducing cost and increasing efficiency”, the other is “controlling blasting fragmentation”. Three groups of orthogonal tests are used to evaluate the application effect of air interval blasting technology. The photo photography method is used to identify the fragmentation distribution after blasting. Firstly, the matlab program is optimized with reference to relevant literature to process the fragmentation image into fragmentation distribution data. Secondly, the data is imported into Origin software to generate fragmentation distribution curve to evaluate the blasting effect. The test results show that the fragment size distribution of 17.3% interval blasting is close to continuous charging blasting. Conclusions 1: The air interval height has no positive correlation with the final effect., There is a reasonable interval height which is in line with the purpose of reducing cost and increasing efficiency of enterprises. The fragmentation grading evaluation method is used to analyze the uniformity of blasting effects of different charges. Firstly, the fragmentation distribution data is imported into Origin software to fit the blasting fragmentation grading curve. Secondly, five fragmentation evaluation indexes are summarized with reference to relevant literature. The analysis results are the uniformity of blasting block: continuous charge > interval 17.3% > interval 11.5% Conclusion 2: The charging amount can be reduced through the control of central air interval charging technology, so that the blasting effect is close to the traditional continuous charging, which can achieve the purpose of controlling blasting fragmentation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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