Full
Outline
The open stope mining with subsequent filling method is adopted in the open-pit to underground mining in Sijiaying Iron Mine, and horizontal isolation pillars are required to realize the isolation of open-pit and underground mining system to ensure the safety of underground mining. In order to improve the overall stability of the mining area, based on the gravity increase method, the effects of gravity acceleration on the distribution of stress field, displacement field and plastic zone of the open-pit bottom pillar structure system were studied when the thickness of open-pit bottom boundary pillar was 45 m and the width of panel pillar was 20 m. The results show that under the initial gravity acceleration, the pillar structure system is basically in a stable state, and with the increase of the gravity acceleration, the stress concentration phenomenon of the pillar structure system continues to increase. When the gravity acceleration increases to 2 times of the initial one, the maximum principal stress reaches 56.98 MPa. The distribution range of tensile stress also expands with the increase of gravity acceleration, and the value of tensile stress finally reaches the tensile strength of rock mass. Under the initial gravity acceleration, the maximum displacement of the pillar structure system is 259 mm and the distribution range is very small and the pillar system is in a stable state. However, the displacement increases exponentially with the gravity acceleration. The pit bottom boundary pillar and panel pillar within the range of N22 to N26 exploration lines in the mining area are high-risk areas prone to instability, which is likely to cause multiple pillar chain instability and failure. It is suggested that in the process of design and mining, measures should be taken to improve the bearing capacity of the panel pillars and the filling quality of the goaf in the range of N22 to N26 exploration lines, so as to ensure the safety and reliability of the open-pit to underground mining of Sijiaying Iron Mine.
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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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