Full
Outline
Non-explosive mechanical excavation mining has the advantages of small disturbance, high efficiency, low support cost and good roadway shaping effect compared with drilling and blasting method, and the optimal selection of pick parameters is of great significance to efficient excavation. Based on the measured ground stress data and rock mechanics test results of the -525 m, -606 m, and -653 m sections of a certain metal mine, a PFC particle flow rock breaking model of picks was established. Numerical simulation analysis of pick rock breaking after unidirectional unloading was conducted with three types of intrusion angle of 90°, 60°, and 45° under three different stress levels in the middle section. The research results indicate that as the stress level increases, the area of dense nuclei formed by the pick breaking decreases, the length of the strip-shaped crack propagation shortens, and the number of microcracks generated during the rock breaking process also decreases, indicating that high stress conditions have a suppressive effect on rock fragmentation. Under the 45° intrusion angle rock breaking mining, the traction and cutting force fluctuations of the cutting tooth are small and the cutting force always maintains a high level. At the same time, the number of microcracks generated by rock breaking at a 45° intrusion angle is much greater than that at 60° and 90° intrusion angles. Combining the comprehensive analysis of mechanical response and rock fragmentation effect, the 45° intrusion angle has the optimal rock breaking performance at varying stress levels.
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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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