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首页> 外文期刊>Bulletin of engineering geology and the environment >Permeability of remoulded low-plasticity clay contaminated by bioethanol-based fluids
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Permeability of remoulded low-plasticity clay contaminated by bioethanol-based fluids

机译：被生物乙醇基流体污染的重塑低塑性粘土的渗透性

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摘要

Low plasticity clays are commonly present in compacted soils such road embankments: in this context, prolonged spillage from storage tanks (e.g., refueling stations) containing conventional and alternative fuels (biofuels) may trigger changes in the hydrogeological and geotechnical properties of the soil structure, influencing its overall stability. Moreover, these changes may facilitate migration of pollutants into the environment. This article examines the effect of bioethanol-based fluids on the coefficient of permeability of kaolinitic clay, experimentally investigated by means of an oedometer set up for a falling-head permebilty test. Test results indicate that the addition of high fractions of ethanol in gasoline substantially increases the permeability up to two orders of magnitude with respect to water: changes are produced by the formation of clusters (flocculation) and the development of cracks and pores identifiable at both a macro and micro scale using a high-resolution scanning electron microscope. Although the intrinsic permeability increases with increasing fractions of ethanol in water, no appreciable changes were observed when pure ethanol or a mixture of ethanol/water up to 50 % were used as pore fluids. This work is to be considered as a starting point for further studies, to be extended to other clayey soils with low plasticity used in road engineering: results may be also useful in designing remediation techniques in areas potentially affected by ethanol spillage from refineries or pipelines.
机译：低可塑性粘土通常存在于压实土壤中，例如路堤：在这种情况下，含有常规燃料和替代燃料（生物燃料）的储罐（例如加油站）长时间溢出可能会触发土壤结构的水文地质和岩土特性变化，影响其整体稳定性。而且，这些变化可以促进污染物向环境中的迁移。本文研究了基于生物乙醇的液体对高岭土渗透系数的影响，该实验是通过为落头渗透性测试设置的里程表进行实验研究的。测试结果表明，相对于水，在汽油中添加高比例的乙醇会显着提高渗透率至两个数量级：由于团簇的形成（絮凝）而产生的变化以及在两个方向上都可以识别出的裂纹和孔隙的产生。使用高分辨率扫描电子显微镜观察宏观和微观尺度。尽管固有​​渗透率随水中乙醇含量的增加而增加，但当使用纯乙醇或乙醇/水含量高达50％的混合物作为孔隙液时，未观察到明显的变化。这项工作应被视为进一步研究的起点，并扩展到道路工程中使用的其他低可塑性黏性土壤：研究结果可能对设计精炼技术或在可能受到精炼厂或管道乙醇泄漏影响的地区的修复技术中有用。

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