Full
Outline
Against the backdrop of panel mining utilizing the stage open stoping with subsequent backfill method during the transition from open-pit to underground mining at Sijiaying Iron Mine, three stope mining sequence schemes were proposed: "from one side to the other" "from the center to both sides", and "from both sides to the center". A numerical simulation approach was employed to investigate the stress field distribution characteristics, displacement variations, and plastic zone propagation laws of the surrounding rock in the panel stope under different mining sequences. Ultimately, the "from the center to both sides" sequence was determined to be the optimal mining scheme for this mine. The results are shown as follows. Firstly, across the three mining schemes, the compressive stress following stress release, the tensile stress, and the maximum internal displacement within the surrounding rock consistently exhibit a trend of "from the center to both sides" < "from both sides to the center" < "from one side to the other". Secondly, under the "from the center to both sides" scheme, the compressive stress and maximum tensile stress of the surrounding rock following stress release are 1.58 MPa and 0.35 MPa, respectively, with a maximum internal displacement of 37.765 mm; these values are universally superior to those of the other two schemes. Finally, following panel extraction, the total volume of the plastic zone in the surrounding rock, and the volume ratio between the tensile plastic zone and the total plastic zone, exhibit the same variation law as the surrounding rock stress field and displacement field. Specifically, the "from the center to both sides" scheme yields a total plastic failure volume of 34.73×104 m3 and a tensile plastic zone ratio of 60.60%, both of which outperform the alternative schemes. These findings hold significant implications for guiding the design and future production of the mine during its transition from open-pit to underground operations.
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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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