Full
Outline
There are significant differences in mechanical properties and failure modes among backfill with different sizes. In order to study the size effect of backfill, the uniaxial compression experiments were conducted on four groups of backfill specimens with different sizes, and an acoustic emission meter was used to monitor the energy release during the loading process. Numerical simulation was used to simulate and verify the compression failure of the specimens and study the size effect and damage characteristics of cylindrical backfill specimens with different sizes. Finally, the scanning electron microscope tests were carried out on the cylindrical specimens of gangue cemented backfill with different sizes, and the microscopic morphology difference of different sizes of specimens was observed. The results show that the uniaxial compressive strength of the specimen is inversely proportional to the size of the specimen. The small size specimen is dominated by shear failure. When the size of the specimen increases to a certain extent, it shows a certain tensile failure. With the increase of the size of the specimen, the specimen shows a more obvious size effect. The acoustic emission characteristic of the cylindrical specimen can be divided into the initial preparation stage, the acoustic emission increasing stage and the acoustic emission decreasing stage. The acoustic emission activity of the specimen with small size is more intense than that with the large size. The larger the size of specimen, the more weak points in the specimen, and the worse the cementation ability of the specimen. The research results can provide a scientific basis for the determination of backfill parameters of different size structures in gangue cemented filling.
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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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