Full
Outline
In response to the engineering difficulties of strength design of filling body during deep phosphate mining, a combination of on-site monitoring and numerical simulation was used to monitor the stress of the cemented backfill in the full-time (filling stage, curing stage, bearing stage) of the mining site, so as to obtain the internal stress evolution law of the filling body. Numerical simulation analysis shows that after the first stage of mining and filling is completed, the stress is mainly generated by the reserved pillar bearing the overlying rock mass. After the completion of the second stage of mining and filling, the stress distribution of the filling body in the mining area is uneven, with a stress distribution pattern of “large in the middle and small at both sides” inside the filling body. The average stress on the filling pillars is 3.0 MPa. The on-site measured data analysis shows that the filling body is a passive bearing body, and it gradually begins to bear after blasting and mining the adjacent pillars of the filling body. After the back filling of the side pillar of the filling body, the maximum vertical stress reached 0.714 MPa. The mining area adopts a filling body with a design strength of 3.0 - 3.5 MPa, which can resist the disturbance stress generated by blasting mining, and the filling body is in a stable state.
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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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