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Outline
The rational design of stope filling body is very important to ensure the safe and efficient mining of mines. Based on the engineering background of a stope mined by large-diameter deep hole open stoping with subsequent filling mining method, the reasonable strength of filling body in stope was studied by combining theoretical calculation and numerical simulation. The stress, displacement and surface subsidence deformation law inside the filling body of the stope were explored. The results show that the maximum principal stress inside the filling body gradually increases with the progress of mining. The stress is mainly compressive stress, which is more obvious at the roof and floor. The strength change of the filling body has little effect on the maximum and minimum principal stress peaks, but the increase of the strength of the filling body reduces the stress radiation range. The increase of the strength of the filling body reduces the roof subsidence space and limits the roof deformation, and its constraint effect on the roof is better than that of the surface. Under the influence of excavation disturbance, the displacement inside the filling body presents a step-like change rule. Under the working condition that the strength of the filling body in stope is 2.5 MPa at the 10 m of top and bottom and 1.5 MPa in the middle part, the maximum tilt deformation, curvature, maximum horizontal deformation in X-direction, and maximum horizontal deformation in Y-direction of the surface monitoring line are 0.109, 0.181×10－3,－0.024, and 0.059 mm/m, respectively. All these values meet the requirements of the safety regulations for the impact of surface subsidence on structures.
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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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