Effect of Bentonite Addition on Geotechnical Properties of Oil-Contaminated Sandy Soil

Amirhossein Mohammadi, T. Ebadi, M. Ahmadi
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引用次数: 10

Abstract

Oil and its derivatives not only change the chemical and biological properties of the soils, but also affect their geotechnical properties. Effects of oil contamination on a sandy soil which mixed with bentonite was assessed in terms of compaction, shear strength, and consolidation behavior. The experiments were carried out by polluting dry sandy soil with 2.5, 5, 7.5, 10% w/w crude oil at different bentonite contents (0, 5, 10, 15, 20% w/w). Results of compaction tests indicated that at a fixed bentonite content, with increasing crude oil content, the maximum dry density increases, while the optimum water content decreases. Similarly, at a fixed contaminant content, increasing the bentonite content in the soil leads to increase in soil maximum dry density and the optimum moisture content. Moreover, direct shear tests revealed that at a specific bentonite content, higher contamination concentration causes lower internal friction angle. The effect of oil content on the coefficient of consolidation (Cv) and void ratio of soils with 0, 5, 10, 15, and 20 percent bentonite contents was studied. The results of consolidation tests indicated that at a fixed bentonite content Cv has an overall increasing pattern which is in its maximum amount at 5% oil content.
膨润土对含油砂土岩土性能的影响
石油及其衍生物不仅改变了土壤的化学和生物特性,而且影响了土壤的岩土力学特性。从压实度、抗剪强度和固结性能等方面评价了石油污染对掺有膨润土的砂土的影响。实验采用2.5、5、7.5、10% w/w的原油,在不同的膨润土含量(0、5、10、15、20% w/w)下污染干砂土。压实试验结果表明,在一定的膨润土含量下,随着原油含量的增加,最大干密度增大,而最佳含水量减小。同样,在污染物含量一定的情况下,土壤中膨润土含量的增加会导致土壤最大干密度和最佳含水率的增加。直接剪切试验表明,在一定的膨润土含量下,污染浓度越高,内摩擦角越小。研究了膨润土含量分别为0、5、10、15和20%时,含油量对土的固结系数(Cv)和空隙率的影响。固结试验结果表明,在一定的膨润土含量下,Cv总体呈增加趋势,在含油量为5%时达到最大值。
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