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Outline
Aiming at the problems of low production capacity, many mining and cutting projects, high cost, poor working environment, many hidden dangers and high risks in the 2 230 m and 2 170 m middle stopes of Pakrut Gold Mine, based on the rock physical and mechanical properties tests and RMR (rock mass geomechanics classification index), the reasonable stope size was obtained by using Mathews stability diagram method. The stope was changed from the original four 12 m low segments to two 21 m high segments. Taking the mining width as the variable, the stability of the stope under the condition of mining one block separated by three blocks was simulated by FLAC3D, and the optimal stope width was determined to be 11−12 m. The industrial test indicated that after optimizing the structural parameters of stope, the stope production capacity was increased by 20%, the loss rate was reduced by 4.67 percentage points, the dilution rate was reduced by 3.25 percentage points, and the kiloton mining ratio was reduced by 36%, and the stope did not collapse, the desired results had be reached. The research shows that based on the rock physical and mechanical properties tests and RMR rock classification, the method of optimizing stope structure parameters by Mathews stability diagram method and FLAC3D numerical simulation and then verifying the parameters by industrial test has a high application value.
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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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