Full
Outline
In a gold mine, the uniaxial compressive strength of ultra-fine unclassified tailings backfill cannot satisfy the requirements of stope filling. To improve the backfill strength, steel fibers, polypropylene fibers and steel-polypropylene hybrid fibers were adopted as reinforcement materials for backfill, and the effects of fiber type, fiber dosage and curing age on the backfill strength were systematically analyzed. Based on the test data, a prediction model for backfill strength integrating Gaussian Process Regression (GPR) and Shapley Additive Explanations (SHAP) was proposed. The research results show that both steel fibers and polypropylene fibers can effectively enhance the backfill strength. Compared with the fiber-free blank control group, all fiber systems achieve the optimal strength enhancement at a fiber dosage of 0.3%. A typical nonlinear relationship of "promotion at low dosage and inhibition at high dosage" exists between fiber dosage and backfill strength. In addition, the established strength prediction model exhibits excellent prediction performance, and the average relative error of strength prediction is controlled within 10%. The SHAP analysis can accurately quantify the influence degree of fiber type, fiber dosage and curing age to backfill strength. The research results provide a quantitative basis for the mix proportion design of fiber-modified backfill and help promote the intelligent development of mine backfilling engineering.
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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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