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随着城市加油站设备逐渐老化及数量不断增加,油品渗漏污染形势日趋严峻。为了弄清油品渗漏污染所带来的城市环境岩土工程问题,本文以加油站0号柴油污染为例,采用直剪、变水头渗透试验及压缩试验,研究了柴油含量(0、4%、8%、12%和16%干土重)对油污粉质粘土的强度、渗透性及压缩性的影响,并结合颗粒分析试验研究其工程性质的变化机理。试验结果表明:随着柴油含量的增加,土的粘聚力先增大后减小,而内摩擦角、渗透系数和压缩系数则先减小后增大,其转折点均出现在柴油含量为0到8%之间。当柴油含量较小(低于转折点)时,柴油对土的影响主要表现为液桥连结、润滑及堵塞孔隙的作用;当柴油含量较大(高于转折点)时,柴油的存在使得土粒发生絮凝,土颗粒粒径明显增大,大孔隙数目增多,表现出粉质粘土砂化现象。
With the gradual aging of urban gas station equipment and the increasing number of oil leakage pollution situation is becoming more and more serious. In order to understand the urban environment geotechnical problems caused by leakage of oil products, this paper takes petrol station 0 as an example, using direct shear, variable head penetration and compression tests to study diesel content (0,4 %, 8%, 12% and 16% of dry soil weight) on the strength, permeability and compressibility of oily silty clay were studied. The change mechanism of engineering properties was also studied by particle analysis. The experimental results show that with the increase of diesel oil content, the cohesion of soil first increases and then decreases, while the internal friction angle, permeability coefficient and compression coefficient decrease first and then increase, and the turning points appear in the diesel oil content of 0 To 8%. When the diesel content is small (below the turning point), the effect of diesel on the soil is mainly manifested as the effect of liquid bridge connection, lubrication and plugging of the pores. When the content of diesel oil is larger (higher than the inflection point), the presence of diesel makes soil particles occur Flocculation, soil particle size increased significantly, the increase in the number of large pores, showing silty clay sand phenomenon.