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首页> 外文期刊>Arabian journal of geosciences >Application of fractal theory to characterize desiccation cracks in contaminated clayey soils
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Application of fractal theory to characterize desiccation cracks in contaminated clayey soils

机译：分形理论在污染粘土土壤中干燥裂缝中的应用

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摘要

The formation and development of desiccation cracks in contaminated clayey soils is a complex process that affects the strength, stability, and permeability of these soils. To investigate the relationship between different concentrations of pollutants and the characteristics of the desiccation cracks in contaminated clayey soils, soil samples are prepared with different concentrations of acetic acid as the pollutant in this study. Free desiccation tests are carried out to examine the cracks in the contaminated clayey soil samples in the laboratory setting. The rate of water loss and the development of surface desiccation cracks in the soil samples with different concentrations of acetic acid are monitored. The characteristics of the structure of the surface cracks are then described and quantitatively analyzed by using a geographic information system, which involves calculating the fractal dimension with ArcGIS. The results indicate that the characteristics of the development of the surface cracks are different due to the influence of different concentrations of acetic acid. The most rapid development of cracks takes place in the soil sample with 0.4mol/L of acetic acid, as the influence of the concentration of acetic acid on the rate of water loss is minimal. Three stages are found in the development of cracks in the soil samples: the early, intermediate, and final stages of cracking. The fractal dimension increases rapidly with increased concentration of acetic acid in the early and intermediate stages of cracking. The results therefore have significance for dealing with acid-contaminated foundation and soils.
机译：污染粘土土壤中干燥裂缝的形成和发展是一种复杂的过程，影响这些土壤的强度，稳定性和渗透性。为了探讨不同浓度污染物与污染粘土土壤中干燥裂缝的特征之间的关系，用不同浓度的醋酸作为本研究的污染物制备土壤样品。进行游离干燥试验，以检查实验室环境中污染的粘土土壤样品中的裂缝。监测水分损失率和具有不同浓度乙酸的土壤样品中表面干燥裂缝的发展。然后通过使用地理信息系统描述和定量地分析表面裂缝的结构的特性，这涉及使用ArcGIS计算分形尺寸。结果表明，由于不同浓度的乙酸的影响，表面裂纹的发展的特性是不同的。裂缝最快的裂缝发展发生在土壤样品中，乙酸0.4mol / L乙酸，因为醋酸浓度对水损失的影响是最小的。在土壤样品裂缝的发展中发现了三个阶段：早期，中间和裂缝的最终阶段。分形尺寸随着裂化的早期和中间阶段的缩小浓度增加而迅速增加。因此，结果对处理酸污染的基础和土壤具有重要意义。

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