Full
Outline
Calcium carbonate can be used as a retarder to increase the flowable time of the filling slurry. In order to study the influence of calcium carbonate on the mechanical properties of paste filling body, the single factor and orthogonal method were used to design the filling body material ratio scheme, and the filling body was prepared. The uniaxial compression test was carried out on the filling body specimen, and the acoustic emission change of the filling body during the loading process was monitored in real time. The microstructure of the crack of the specimen was observed by SEM. The influence law and weight order of each factor on the compressive strength of the filling body were studied, and the failure mechanism of the filling body was analyzed from multiple perspectives. The results show that with the increase of calcium carbonate mass fraction, the strength of filling body decreases first and then increases. After adding calcium carbonate, the influence of mass fraction of fly ash, cement and solid material on the strength of filling body at each curing age (3 d, 7 d, 28 d) is basically the same as that before adding calcium carbonate. Calcium carbonate has a weak degradation effect on the compressive strength of filling body, but it has a price advantage and can be used as a retarder for filling materials. Based on the range analysis, the weight order of the influence of each factor on the 28 d strength of the filling body is cement mass fraction>calcium carbonate mass fraction>solid mass fraction>fly ash mass fraction. According to the failure characteristics of filling body, with the increase of curing age, the failure mode of filling body changes from ductile splitting to brittle shear failure. The acoustic emission ringing count changed abruptly before and after the initial compaction of the filling body approaching the elastic deformation stage and the peak stress, which revealed the internal damage evolution process of the filling body.
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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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