Engineering property test of kaolin clay contaminated by diesel oil
Engineering property test of kaolin clay contaminated by diesel oil
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DOI：
10.1007/s11771-015-3035-3
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发表时间：
2015-12
影响因子：
4.4
通讯作者：
Zhi-bin Liu;Song-yu Liu;Y. Cai
中科院分区：
文献类型：
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作者：
Zhi-bin Liu;Song-yu Liu;Y. Cai
通过一系列室内试验，研究了柴油污染高岭土的工程性质。选取含油量(质量分数)为4%、8%、12%、16%和20%的土样分别代表不同的污染程度，采用搅拌静压的方法人工制备土样。试验高岭土的初始含水率和干密度分别控制在10%和1.58g/cm3。试验结果表明，由于部分柴油会通过蒸发从土壤中释放出来，因此应通过对传统试验方法得到的准含水率进行标定来求取实际含水率。随着高岭土污染程度的增加，液限和塑限均降低，但塑性指数略有增加。含油量越高，受污染高岭土在封闭条件下的膨胀压力越低。油污高岭土的无侧限抗压强度不仅受含油量的影响，而且还受养护时间的影响。随着污染程度的增加，高岭土试件的抗剪强度不断降低。此外，受污染的高岭土在一定含水率下的电阻率随着含油量的增加而减小。而土壤电阻率与土壤含油量、土壤容积率有很好的相关性。高岭土工程性质由以水为主向以油为主转变的临界值为含油量为8%。
Engineering property of kaolin clay contaminated by diesel oil was studied through a series of laboratory experiments. Oil contents (mass fraction) of 4%, 8%, 12%, 16% and 20% were selected to represent different contamination degrees, and the soil specimens were manually prepared through mixing and static compaction method. Initial water content and dry density of the test kaolin clay were controlled at 10% and 1.58 g/cm3, respectively. Test results indicate that since part of the diesel oil will be released from soil by evaporation, the real water content should be derived through calibration of the quasi water content obtained by traditional test method. As contamination degree of the kaolin clay increases, both liquid limit and plastic limit decrease, but there’s only a slight increase for plasticity index. Swelling pressure of contaminated kaolin clay under confined condition will be lowered when oil-content gets higher. Unconfined compressive strength (UCS) of the oil-contaminated kaolin clay is influenced by not only oil content but also curing period. Increase of contamination degree will continually lower UCS of the kaolin clay specimen. In addition, electrical resistivity of the contaminated kaolin clay with given water content decreases with the increase of oil content. However, soil resistivity is in good relationship with oil content and UCS. Finally, oil content of 8% is found to be a critical value for engineering property of kaolin clay to transit from water-dominated towards oil-dominated characteristics.