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Outline
Microbially Induced Carbonate Precipitation (MICP) technology shows remarkable potential in tailings pond ecological reinforcement projects due to its environmental friendliness and sustainability characteristics. However, the quantitative study of seepage diffusion during microbial grouting remains a key constraint to its application. Aiming at multi-round microbial grouting reinforcement scenarios and systematically considering the synergistic effect of the sandy soil medium on the slurry diffusion behaviour during the dynamic attenuation of permeability coefficient and the evolution of porosity gradient, a permeability diffusion radius prediction model based on the column diffusion theory was constructed by combining the multi-scale tests and theoretical modelling with a combination of one-dimensional sand column experiments, intermediate-scale 2D planar physical model experiments, and FLAC3D numerical simulations of coupled flow and solidity. The results are concluded as follows. The vertical dimension is dominated by gravity effect, and the slurry diffusion shows significant asymmetry, forming a pagoda-like distribution with the bottom wide and the top narrow, and the final diffusion radius at the bottom is 3.91 times of the diffusion radius at the top. The horizontal dimension follows the radial attenuation law of diffusion effect, and the reinforcement strength is inversely proportional to the centre distance of the slurry injection pipe. Validation of the theoretical model shows that the relative errors between the maximum diffusion radius and the predicted value for the 2nd to 5th rounds of grouting were 43.89%-63.72%, and the error ranges were within reasonable limits. The research results can provides a quantitative theoretical framework for the optimisation of MICP process parameters and engineering-scale diffusion prediction.
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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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