| Cite this article: | 李叶鑫,吕 刚,宁宝宽,等.煤矿复垦排土场裂缝区土壤团聚体分布及稳定性[J].灌溉排水学报,0,():-. |
| LI Yexin,LV Gang,NING Baokuan,et al.煤矿复垦排土场裂缝区土壤团聚体分布及稳定性[J].灌溉排水学报,0,():-. |
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| Distribution and Stability of Soil Aggregates at Ground Fissure in a Coal Mine Reclamation Dump |
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LI Yexin1, LV Gang2, NING Baokuan1, CHEN Sili1, WANG Daohan2
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1.School of Architecture and Civil Engineering,Shenyang University of Technology;2.College of Environmental Science and Engineering,Liaoning Technical University
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| Abstract: |
| 【Objective】Reveal the distribution characteristics of soil aggregates. 【Method】In this paper, typical reclamation sample plots were selected at the surface coal mine reclamation dump in northern grassland of China, the development characteristics of ground fissures (GF) was investigated, the composition and distribution charateristics of soil aggregates with different ground fissures (GF) was determined by dry and wet sieve methods, and the soil aggregate stability and their relationship with ground fissures were analyzed. 【Results】The content of >0.25 mm air-dried soil aggregates among the fissures was 23.02%-42.70%, and which of >0.25 mm water-stable soil aggregates was 16.9%-29.52%. There was no significant difference in the aggregates of air-dried and water-stable soil aggregates. The content of >0.25 mm water-stable soil aggregates in 0-60 cm soil layer with GFⅠ、GFⅡ、GFⅢ was 25.26%, 26.57%, 23.62%. The percentage of aggregate destruction in three fissures was 20.77%-36.17%, 20.52%-25.00%, and 26.58%-40.56%, respectively, and GFⅢ was significantly higher than GFⅠ and GFⅡ. The percentage of aggregate destruction with 0-10, 10-20, 20-30, 30-40, 40-50, and 50-60 cm was 28.81%, 29.96%, 26.19%, 23.50%, 24.91%, and 29.38%, respectively. The fractal dimensions of air-dried and water-stable soil aggregates were 2.847-2.919 and 2.898-2.942, respectively, and aggregates were mainly small aggregates or fine particles. The soil aggregate mean mass diameter (MWD) and geometric mean diameter (GMD) of air-dried soil aggregates in three fissures was 1.11, 1.05, 1.28 mm and 0.45, 0.44, 0.49 mm, respectively, and which of the water-stable soil aggregates was 0.67, 0.73, 0.72 mm and 0.36, 0.38, 0.37 mm, respectively. GF Ⅱ has good soil structure and stability, and strong anti erosion ability. Most of water-stable soil aggregates were in the unstable level, which was related to the formation and development of ground fissures. 【Conclusion】The formation and development of ground fissures would reduce the stability of soil aggregates, resulting in the dispersion of aggregates into smaller aggregates and fine particles. The larger the width and the more obvious of ground fissures, the more significant the influence on the soil aggregate stability. |
| Key words: dump; soil aggregate; ground fissure; soil aggregate stability; fractal |
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