Full
Outline
Aiming at the problem that the impact vibration caused by roof caving threatens the stability of stope in caving mining, a physical simulation experiment was designed based on the mechanism of caving impact vibration and the similarity law of physical simulation. The relationship between the caving impact vibration velocity and the falling height of the caving body, the amount of one caving, the porosity of the cushion, the thickness of the cushion and the distance of the measuring point was systematically studied. The results show that the caving impact vibration velocity is positively correlated with the falling height of the caving body and the amount of one caving, and negatively correlated with the thickness of the cushion and the distance of the measuring point. With the increase of the porosity of the cushion, the caving impact vibration velocity decreases first and then increases. The correlation between the caving impact vibration velocity and each factor from high to low is the distance of the measuring point, the amount of one caving, the falling height of the caving body, the thickness of the cushion, and the porosity of the cushion. Based on the test results and the calculation method of blasting vibration velocity, an empirical formula for calculating the caving impact vibration velocity was constructed and applied to the west No.2 mining area of Jinchuan Longshou Mine. The maximum vibration velocities of roof caving at 1 595 m, 1 554 m and 1 494 m are 6.4 cm/s, 3.7 cm/s and 3.0 cm/s, respectively. The maximum vibration velocities measured in the field are 1.21 cm/s, 0.26 cm/s and 0.09 cm/s, respectively, which verifies the reliability of the measurement method. The research results can provide theoretical basis and practical guidance for the prevention and control of roof caving impact disasters in underground mines.
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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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