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In order to investigate the microscopic structural characteristics and uniaxial damage evolution law of loess-slag-based cemented filling materials with different water-cement ratios, scanning electron microscopy and acoustic emission tests were conducted on the loess-slag-based cemented filling materials. Furthermore, PFC2D was used to investigate the crack evolution and particle damage characteristics of cemented filling materials with different water-cement ratios under uniaxial compression. The results show that when the water-cement ratio is small, the cemented filling material can generate more hydration products and the structure of the specimen is denser. The acoustic emission ringing count curves of cemented filling materials can be divided into compaction stage, linear-elastic deformation stage, crack constant-velocity expansion stage, crack sudden increase stage, and post-peak stage, and the ringing count characteristics are correlated with the strength characteristics. As the water-cement ratio increases, the cracking stress and damage stress during the compression process of the specimen gradually decrease, and the ratio of cracking stress to peak stress and damage stress to peak stress are not affected by the water-cement ratio. When the cemented filling material is damaged, shear cracks are the main type. As the water-cement ratio decreases, the number of cracks increases and the maximum value of the force chain increases. Changing the water-cement ratio has little effect on the spatial distribution of internal cracks and force chains in the specimens.
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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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