Full
Outline
To address the time-varying problem of rheological parameters caused by cementitious material hydration during long-distance transportation of mine backfill slurry, rheological tests of backfill slurry were conducted at a constant temperature of 25 ℃, and the abrupt change law of the yield stress of cement-based backfill slurry at key nodes was revealed. A modified Darcy-Weisbach equation was derived, and an innovative design method for backfill pipelines based on time-varying rheology and sectional resistance was proposed, which was then validated through a 5 km backfill pipeline engineering case. The results are concluded as follows. Firstly, the higher the cement-sand ratio is, the earlier the abrupt change node appears, and the initial yield stress of backfill slurry with a high cement-sand ratio is higher than that with a low cement-sand ratio. Secondly, as the hydration time extends, excessive hydration products cause particle agglomeration and densification of the microstructure, leading to an increase in the plastic viscosity of the slurry and a significant increase in pipeline friction resistance. The greater the cementitious material content, the more obvious the change. Thirdly, compared with the conservative scheme, the time-varying sectional design scheme improves the safety margin of the backfill pipeline by 28.5%, and reduces the pipeline cost and annual energy consumption cost by 22.6% and 26.1%, respectively. The research results can provide a theoretical basis for the construction of mine backfill systems.
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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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