[1]Zhang Wei,Guo Xiaoping,Li Wenye.Study on Suitable Particle Size Gradation of Reconstructed Soil Aquifer in Arid Mining Area[J].Research of Soil and Water Conservation,2024,31(06):290-298.[doi:10.13869/j.cnki.rswc.2024.06.016]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 06
Page number:
290-298
Column:
Public date:
2024-12-10
- Title:
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Study on Suitable Particle Size Gradation of Reconstructed Soil Aquifer in Arid Mining Area
- Author(s):
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Zhang Wei, Guo Xiaoping, Li Wenye
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(School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China)
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- Keywords:
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arid mining area; restructured soil; particle size; principal component analysis; water-holding capacity
- CLC:
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S152.3; S152.7
- DOI:
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10.13869/j.cnki.rswc.2024.06.016
- Abstract:
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[Objective]The aims of this study are to examine the influence of particle size level pairing on the water-holding capacity of the reconstructed soil aquifer, and to improve the water retention and storage capacity of the reconstructed soil in the dump in the western mining area. [Methods]Based on the particle size grading standard of sand soil, sandstone and mudstone weathering were screened into 4 particle size grades(extremely coarse sand: 2~5 mm, coarse sand: 0.5~2 mm, medium sand: 0.25~0.5 mm and fine sand:<0.25 mm). Eleven groups of different particle size grading schemes were designed for gravel sand, coarse sand and medium sand, and soil column simulation tests were conducted to study the water retention performance of different restructured soils under infiltration and evaporation conditions. [Results](1)The infiltration indexes of restructured soil were significantly affected by particle size grading, and the cumulative infiltration amount was significantly negatively correlated with the content of extremely coarse sand(p<0.01). The infiltration time was significantly negatively correlated with the content of extremely coarse sand and coarse sand(p<0.05), and significantly positively correlated with the content of medium sand and fine sand(p<0.01).(2)The cumulative evaporation of restructured soil decreased with the increase of particle size, and increased with the decrease of particle size.(3)The results of principal component analysis showed that the restructured aquifer with the mass ratio of extremely coarse sand:coarse sand:medium sand:fine sand of 4:2:2:2 and 0:2:4:4 had higher scores in the comprehensive evaluation results of water retention performance; but the second group of fine sand and medium sand required a large amount, which was not suitable for practical application. [Conclusion]The particle size gradation has a significant effect on the water-holding capacity of restructured soil. The two groups of aquifer structures with particle size gradation(the particle size decreases in turn)of 4:2:2:2 have strong water-holding capacity, which can be used as the suitable particle size gradation structure of the aquifer for dumping in the western arid mining area.