This study examines the effect of oil contamination on the bearing capacity of silty sandy soil. The silty sandy soil (SM) in this study was obtained from Prachuap Khiri Khan Province, Thailand and the oil product was 95 octane gasoline. The SM soils were prepared in a tank model under the conditions of dry soil, gasoline-contaminated soil of 2%, and gasoline-contaminated soil of 4%. A laboratory experiment (direct shear test) and a field experiment (lightweight penetration test) were performed on SM soil for all conditions. The lightweight penetration test results reveal that the ultimate bearing capacity for the gasoline-contaminated SM soils of 2% and 4% decrease by 30% and 52%, respectively, on average compared to the dry soil condition. Furthermore, the internal friction angle obtained from the direct shear test linearly decreases with the gasoline content. The cohesion of the gasoline-contaminated SM soils increases with increasing gasoline content as according to the second-order polynomial regression. These results reveal that the gasoline contamination causes the loss of shear strength and reduces the ultimate bearing capacity of SM soil.
本文研究油污染對粉質砂質土壤承載力的影響。研究中的粉質砂質土壤(SM)來自泰國的Prachuap Khiri Khan省,油品為95辛烷值汽油。以乾燥土壤為基底在罐模型中製備SM土壤,針對汽油污染土壤2%和汽油污染土壤4%的條件進行分析,同時進行相同條件下對SM土壤進行實驗室實驗(直接剪切試驗)和田間試驗(輕質滲透試驗)。輕質滲透試驗結果表明,與乾燥土壤條件相比,針對2%和4%汽油污染的SM土壤,其對應的極限承載力的平均值分別下降了30%和52%。此外,由直接剪切試驗本文發現內摩擦角隨汽油含量而線性降低的趨勢。而根據二階多項式回歸,汽油污染的SM土壤的內聚力隨著汽油含量的增加而增加。這些結果表明,汽油污染導致剪切強度的損失,降低了SM土壤的極限承載力。
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