In the present study, the effects of phytoremediation using Ophiopogon japonicus and Platycladus orientalis on the compressibility of silty clayey sand contaminated with 3%, 5%, or 7% crude oil was examined over a period of 2 months. Phytoremediation led to a decrease in the total petroleum hydrocarbons. The scanning electron microscopy images showed that an increase in the crude oil content increased flocculation of the fine particles in the soil; however, phytoremediation decreased flocculation of the soil structure. The replacement of water by crude oil decreased the dielectric constant of the fluid in the void space, which decreased the thickness of the double-layer water. These changes caused the soil particles to move closer together and become more flocculated. The Atterberg limits of the contaminated soil increased after phytoremediation. A decrease in soil permeability was observed after phytoremediation in the permeability and consolidation tests. The compression index and coefficient of consolidation increased as the crude oil content and the contamination time period increased. The increase in the compression index at 30 and 60 days of phytoremediation was 6% and 18% less, respectively, than for the untreated samples. The increase in the coefficient of consolidation after phytoremediation also was 15% less than for the untreated samples. It could be concluded that phytoremediation decreased the negative effects of crude oil on the geotechnical properties of the soil over time. It also was effective in decreasing settlement of the soil contaminated with crude oil and decreased the coefficient of volume compressibility.

在本研究中，利用麦冬和侧柏对植物的修复作用在2个月内检查了被3％，5％或7％原油污染的粉质粘土的可压缩性。植物修复导致石油烃总量减少。扫描电子显微镜图像显示，原油含量的增加增加了土壤中细颗粒的絮凝；然而，植物修复减少了土壤结构的絮凝。用原油代替水降低了空隙空间中流体的介电常数，从而降低了双层水的厚度。这些变化导致土壤颗粒向更靠近的地方移动并变得更加絮凝。植物修复后，受污染土壤的阿特伯格界限增加。在渗透性和固结性测试中，植物修复后土壤渗透性降低。压缩指数和固结系数随原油含量和污染时间的增加而增加。与未处理的样品相比，在植物修复的30天和60天时压缩指数的增加分别降低了6％和18％。植物修复后固结系数的增加也比未处理样品少了15％。可以得出结论，随着时间的推移，植物修复减少了原油对土壤岩土特性的负面影响。它还有效地减少了被原油污染的土壤的沉降，并降低了体积压缩系数。压缩指数和固结系数随原油含量和污染时间的增加而增加。与未处理的样品相比，在植物修复的30天和60天时压缩指数的增加分别降低了6％和18％。植物修复后固结系数的增加也比未处理样品少了15％。可以得出结论，随着时间的推移，植物修复减少了原油对土壤岩土特性的负面影响。它还有效地减少了被原油污染的土壤的沉降，并降低了体积压缩系数。压缩指数和固结系数随原油含量和污染时间的增加而增加。与未处理的样品相比，在植物修复的30天和60天时压缩指数的增加分别降低了6％和18％。植物修复后固结系数的增加也比未处理样品少了15％。可以得出结论，随着时间的推移，植物修复减少了原油对土壤岩土特性的负面影响。它还有效地减少了被原油污染的土壤的沉降，并降低了体积压缩系数。与未处理的样品相比，在植物修复的30天和60天时压缩指数的增加分别降低了6％和18％。植物修复后固结系数的增加也比未处理样品少了15％。可以得出结论，随着时间的推移，植物修复减少了原油对土壤岩土特性的负面影响。它还有效地减少了被原油污染的土壤的沉降，并降低了体积压缩系数。与未处理的样品相比，在植物修复的30天和60天时压缩指数的增加分别降低了6％和18％。植物修复后固结系数的增加也比未处理样品少了15％。可以得出结论，随着时间的推移，植物修复减少了原油对土壤岩土特性的负面影响。它还有效地减少了被原油污染的土壤的沉降，并降低了体积压缩系数。可以得出结论，随着时间的推移，植物修复减少了原油对土壤岩土特性的负面影响。它还有效地减少了被原油污染的土壤的沉降，并降低了体积压缩系数。可以得出结论，随着时间的推移，植物修复减少了原油对土壤岩土特性的负面影响。它还有效地减少了被原油污染的土壤的沉降，并降低了体积压缩系数。