Full
Outline
Regarding the problem of collecting the impact frequency of open-pit down-the-hole drill rigs, based on the characteristics of the drilling acoustic signals of the TAIYE-390-Ⅱ split hydraulic open-pit down-the-hole drill rig, the impact frequency acquisition system and acquisition method were analyzed. Under the condition of constant wind pressure and constant axial pressure, drilling acoustic experiment and blasthole peep experiment were carried out to study the stability of the system and the feasibility of impact frequency in the identification of rock mass structural plane. The results show that 6 kHz is the most obvious signal dominant sampling frequency of the impact section waveform. The impact frequency acquisition method of acoustic signal in drilling process based on Hilbert transform, variational mode decomposition (VMD) and Savitzky-Golay filter can accurately extract the real-time impact frequency of drilling, and the error is controlled at 1 Hz. The impact frequency has a relatively obvious response to the rock mass structure. When encountering various structural planes, the value of the impact frequency will decrease by 1−3 Hz. The research results have important theoretical significance and application value in aspects such as the collection of the impact frequency of down-the-hole drills and the identification of rock mass structural planes.
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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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