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石油因管道泄漏等因素进入环境当中,影响土体工程性质并带来环境岩土工程问题。利用室内击实试验、固结压缩试验、无侧限抗压强度试验以及微观扫描电镜结果,研究不同石油污染程度下土体工程性质的变化规律。试验结果表明:随着石油污染程度增大,污染土体干密度峰值增大,最优含水率降低;压缩性随之增大;当污染土无侧限抗压强度在石油浓度较低时,随浓度的增大而增大,当石油浓度为4%时,达到峰值,而后随着石油污染浓度继续增大无侧限抗压强度逐渐降低。微观扫描电镜结果表明:土体受石油污染之后,土颗粒分布由分散均匀体结构转变为絮状和颗粒状结构,且土体孔隙明显增大。
Oil into the environment due to pipeline leakage and other factors, affecting the nature of soil engineering and environmental geotechnical problems. The indoor compaction test, consolidation compression test, unconfined compressive strength test and microscopic scanning electron microscopy (SEM) results were used to study the variation of soil engineering under different oil pollution levels. The results show that with the increase of petroleum pollution, the peak of dry density of contaminated soils increases, the optimum moisture content decreases and compressibility increases. When the unconfined compressive strength of contaminated soils is low, With the increase of concentration, when the oil concentration is 4%, it reaches the peak value, and then with the oil pollution concentration continues to increase, the unconfined compressive strength decreases gradually. The microscopic scanning electron microscopy results show that after the soil is polluted by petroleum, the distribution of soil particles changes from dispersed homogenous structure to flocculent and granular structure, and the pore of soil increases obviously.