Full
Outline
In order to solve the problem of water inrush and instability of stope caused by a large amount of fissure water in the water-rich fault fracture zone, taking the stope in the northern area of Zhongguan Iron Mine as the background, the water pressure monitoring tests was carried out. The sensitivity of stope stability to water pressure change was explored by FLAC3D, and the water pressure gradient with obvious change was obtained. Then, a numerical model of "water pressure-waterproof layer thickness" was established to explore the control effect of different water pressure values and waterproof layer thicknesses on stope stability. The stability and variation rules were analyzed with the distribution of roof stress, displacement and plastic zone as indicators, and the relationship between water pressure and waterproof layer thickness was obtained. The results show that the ore body in the northern area of Zhongguan Iron Mine is a typical water-rich deposit, and the water pressure is between 0.1 MPa and 2.0 MPa. When the water pressure is greater than 1.0 MPa, the influence of water pressure on the roof stability is significant. Based on the comprehensive analysis of the variation trends of stress, displacement and plastic zone, the following conclusions are drawn: when the water pressure is 0.1 MPa, the the waterproof layer thickness should not be less than 1.8 m; when the water pressure is 0.5 MPa, the waterproof layer thickness should not be less than 3 m; when the water pressure is 1.0 MPa, the waterproof layer thickness should not be less than 4 m; when the water pressure is 1.5 MPa, the waterproof layer thickness should not be less than 5.6 m; when the water pressure is 2.0 MPa, the waterproof layer thickness should not be less than 7.1 m. The simulation results provide theoretical support for determining the waterproof layer thickness corresponding to different water pressure values in this ore body.
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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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