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Outline
Aiming at the problems of poor roadway stability and difficulty in forming in the conventional mining process of soft sandstone-type uranium deposit, the similar simulation test were carried out. The fine sand, the barite powder, the swelling soil and the 425 normal portland cement were selected as the raw materials. The similar material tests with different material ratios were carried out by the orthogonal experiment. Finally, the similar materials close to the physical and mechanical parameters of the ore rock were obtained. The similar material ratio is as follows: the mass ratio of lime to sand is 1∶8, the m(barite powder)∶m(sand) is 20%, the m(bentonite)∶m(sand) is 8%, and the particle size of fine sand is less than 2.00 mm. The key factors of similar materials such as the density, the compressive strength and the tensile strength are close to the ore rock. The error rates are controlled within 7%. The results of the similar material ratio can meet the requirements of the similar simulation test. The soft sandstone similar material obtained in this test can provide basic material for similar simulation test of the roadway excavation and support.
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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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