ABSTRACT

Studies involving oil-contaminated lateritic fine-grained soils are still scarce in literature, especially regarding treatments for improving soils mechanical properties. In this study, geotechnical properties and microstructure of a diesel-contaminated lateritic soil treated with lime are investigated and compared to tests conducted on lime-treated soil (2% to 8% lime) and diesel-contaminated soil (2 to16% diesel). The presence of diesel had no significant effect on soil plasticity but decreased soil strength. Lime stabilization applied to diesel-contaminated soils significantly improved soil properties after 6% of lime stabilizer. The diesel presence led to an inhibition of lime reaction due to reduction of cation exchange capacity and flocculation, which reflected in loss of its effectiveness in improving strength as compared to natural soil response. The water retention behavior and unsaturated hydraulic conductivity of soil were affected by diesel contamination, leading to curve shapes similar to clay materials. Adding 2% of lime to the contaminated soil, increase in the soil pores and changes in the shapes of water retention curve and k-functions were observed with similar behavior of a course-grained material. Overall, this study highlights how the presence of diesel and lime affects lateritic soil properties and microstructure.

摘要

涉及受油污染的红土细粒土壤的研究在文献中仍然很少见，特别是关于改善土壤机械性能的处理方法。在这项研究中，研究了用石灰处理的柴油污染红土土壤的岩土特性和微观结构，并与对石灰处理的土壤（2% 至 8% 的石灰）和柴油污染的土壤（2% 至 16% 的柴油）进行的测试进行了比较。柴油的存在对土壤可塑性没有显着影响，但会降低土壤强度。石灰稳定剂应用于柴油污染土壤后，6% 的石灰稳定剂显着改善了土壤性质。由于阳离子交换能力和絮凝的降低，柴油的存在导致石灰反应的抑制，这反映在与自然土壤反应相比，其在提高强度方面的有效性的丧失。土壤的保水行为和非饱和导水率受到柴油污染的影响，导致曲线形状类似于粘土材料。在受污染的土壤中添加 2% 的石灰，观察到土壤孔隙增加以及保水曲线和 k 函数形状的变化，与粗粒材料的行为相似。总的来说，这项研究强调了柴油和石灰的存在如何影响红土土壤性质和微观结构。观察到土壤孔隙的增加以及保水曲线和 k 函数形状的变化，与粗粒材料的行为相似。总的来说，这项研究强调了柴油和石灰的存在如何影响红土土壤性质和微观结构。观察到土壤孔隙的增加以及保水曲线和 k 函数形状的变化，与粗粒材料的行为相似。总的来说，这项研究强调了柴油和石灰的存在如何影响红土土壤性质和微观结构。