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With the increase of mining depth, the backfill body is affected by high ground stress, mining disturbance and groundwater erosion. In order to explore the influence of groundwater erosion on the mechanical properties of cemented backfill body with polypropylene fiber tailings, uniaxial compression test and Brazilian splitting test were carried out on specimens with different fiber contents, and specimens with better mechanical properties were selected. Based on the groundwater erosion environment, uniaxial compression and acoustic emission monitoring tests were carried out to study the damage and failure evolution characteristics of polypropylene fiber backfill body under the action of groundwater. The results show that with the increase of polypropylene fiber content, the compressive strength of backfill body increases first and then decreases, and the peak strength of the specimen with 0.3% fiber content is 3.82 MPa, which is the best. After groundwater erosion, the cumulative ringing count characteristics of acoustic emission can be divided into three stages: initial active stage, steady growth stage and rapid growth stage, and obvious damage precursor characteristics appear in the steady growth stage. The durability of the backfill body specimens with different pH erosion of groundwater is as follows: eroded backfill body specimens with pH=9> eroded backfill body specimens with pH=7> eroded backfill body specimens with pH=5> non eroded backfill body specimens. With the increase of groundwater pH, the RA-AF shear crack signal continues to decrease, the damage and failure of the backfill body changes from shear failure to tensile failure. The research results can provide reference for the improvement of mechanical properties and durability of mine backfill 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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