Full
Outline
The composite filling structure with strong-weak combination formed by the two-step filling mining bears the roof load jointly, and its overall creep characteristics directly affect the long-term stability of the filling stope. Uniaxial step-loading creep tests were carried out to analyze the influence of different combinations of strong and weak media on the creep characteristics of composite filling specimens. On this basis, considering the time-dependent degradation effect of material mechanical properties and the characteristics of the accelerated creep stage, an improved Nishihara model capable of characterizing the creep characteristics of the composite filling structure was established. The study shows that the strong media has a more significant impact on the overall creep characteristics of the composite specimens. As the strength of the strong media increases from 23.60 MPa to 33.80 MPa, the elastic modulus increases from 1.85 GPa to 2.18 GPa, and the axial creep increments under the first three stress levels decrease by 59.72%, 57.35%, and 55.08%, respectively. The instantaneous creep rates decrease by 31.55%, 21.46%, and 23.14%, respectively. The transverse strain difference between the strong-weak media increases from 260 με, 368 με, and 524 με to 685 με, 895 με, and 1 032 με, respectively. The overall creep failure mode of the specimens transforms from shear failure to compressive splitting failure. The improved Nishihara model achieves a fitting accuracy exceeding 0.93 for the experimental data, effectively simulating the entire creep process of the composite filling structure.
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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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