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Outline
Aiming at the reasonable safe width of pillars in cut-and-fill stoping of steeply inclined thick and large phosphorite ore bodies, a mechanical analysis model of stope pillars was established based on elastic mechanics theory. The average bearing load of pillars due to the backfill was calculated, and a stope structural layout consisting of roof pillars and stope pillars was adopted. Cusp catastrophe theory was used to analyze the critical instability conditions of pillars, and the formula for critical failure width of pillars was then deduced, with which the critical pillar width is calculated to be 3.591 m. On this basis, numerical simulation was carried out to investigate the deformation and failure characteristics of surrounding rock in a stope with width of 10 m and pillar widths of 2 m, 3 m, 4 m and 5 m respectively. The comparison results of displacement and plastic zone indicate that roof subsidence gradually decreases with the increase of pillar width. When the pillar width is 5 m, the maximum roof subsidence is 30.95 mm and the plastic zone is only distributed in local roof areas. Engineering practice has verified that with pillars 5 m in width, the maximum displacement and maximum stress of the pillars are 18.47 mm and 4.32 MPa respectively, and both the stope and backfill remain in a stable state, which meets the requirements of engineering safety and economic efficiency.
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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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