Full
Outline
Most of the backfill near the mining working face are in the environment of cycle temperature. In order to study the influence of cycle temperature on the damage evolution and failure characteristics of cemented tailings backfill, digital image correlation (DIC) and acoustic emission (AE) techniques were used to conduct uniaxial compression tests on cemented tailings backfill after curing at six different cycle temperatures. The fracture process and acoustic emission behavior characteristics of cemented tailings backfill at different cycle temperatures were analyzed, and the damage model and constitutive equation of cemented tailings backfill at different cycle temperatures were established. The results show that with the increase of cycle temperature, the compressive strength, elastic modulus and peak strain of cemented tailings backfill increase first and then decrease, and all reach the maximum value when the cycle temperature is 25−40 ℃. With the increase of cycle temperature, the failure pattern of cemented tailings backfill changes from shear failure to tensile-shear composite failure, and then to tensile failure. The intensity of the acoustic emission ringing count signal in the initial compaction stage and the post-peak failure stage is different due to the different cycle temperature. The sudden change of the acoustic emission ringing count can be used as a precursor to the failure of the backfill. The reliability of the model is verified by comparing the theoretical calculation value of the constitutive model of the backfill parameters with the experimental measured value. The research results can provide reference for the design of backfill near the working face.
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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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