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Effects of hydrocarbon contamination on the engineering geological properties of Neogene clays and Pleistocene glacial tills from Central Poland

Dobak Paweł, Izdebska-Mucha Dorota, Stajszczak Piotr, Wójcik Emilia, Kiełbasiński Kamil, Gawriuczenkow Ireneusz, Szczepański Tomasz, Zawrzykraj Piotr, Bąkowska Anna

Acta Geologica Polonica

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2022

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Vol. 72, no. 4

529--555

EN

Petroleum products influence the engineering behaviour of the soil. Neogene clays and glacial tills from Central Poland were tested under laboratory conditions to evaluate the changes of selected physical and mechanical parameters: particle size distribution, particle density, swelling, shear strength and permeability. Four petroleum products were used in the experiments: diesel fuel, kerosene, jet fuel and mineral engine oil. The study revealed that even for the lowest degree of contamination the values of physical and mechanical properties of the soils changed significantly. Greater variation can be expected in soils contaminated with high-viscosity compounds. Also, higher relative changes were found for glacial tills than for Neogene clays. Consolidation tests revealed changes in soil permeability depending on the soil composition and the physical properties of the contaminant – considerable reduction of permeability was observed for glacial tills contaminated with light Jet fuel, while the reduction was lower for Neogene clays. The obtained results indicate the role of mesopores and the dimensionless pore pressure coefficient in changes of soil permeability. The methodological issues regarding testing and analysing the hydrocarbon-contaminated soils were also presented and discussed, which might be useful for researchers studying contaminated soils.

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Wpływ zanieczyszczenia olejem napędowym na uziarnienie i plastyczność mad z rejonu Warszawa-Siekierki

Izdebska-Mucha Dorota, Trzciński Jerzy, Klein Marta

Przegląd Geologiczny

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2021

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Vol. 69, nr 12

800-810

EN

The paper presents the results of testing flood facies sediments - muds. The term “‘muds” refers to a genetic type of deposits, regardless of their variability in particle size composition and organic matter content. Due to the poor geological engineering properties, such as, high lithological variability, low degree of diagenesis, as well as high moisture content and organic matter content, muds are classified as weak soils and river valleys are the areas of complicated ground conditions. The paper presents lithological, physical and chemical properties of muds from the floodplain of the Vistula River valley in the area of Warsaw-Siekierki. A series of mud samples contaminated with diesel fuel in the range of 2-16%wereprepared. The microaggregate analyses as well as the plastic and liquid limit tests showed a significant effect of contamination on the soil index properties. The increase in diesel fuel content resulted in the loss of soil plasticity and cohesion. The aggregation of clay particles and the increase in the silt fraction content was observed. The most significant changes of properties were obtained for the mud samples containing 6-16% of diesel fuel. The research of soils contaminated with petroleum products is of great importance in determining the geological engineering conditions of the subsoil for foundation purposes.

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Zmiany mikrostrukturalne gliny lodowcowej spowodowane zanieczyszczeniem olejem napędowym

Izdebska-Mucha Dorota, Trzciński Jerzy

Geologos

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2007

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Vol. 11

463--472

PL

W artykule przedstawiono analizę zmian mikrostruktury gliny lodowcowej zanieczyszczonej in situ olejem napędowym. Badania zostały wykonane z zastosowaniem skaningowego mikroskopu elektronowego oraz programu komputerowego STIMAN do ilościowej analizy zdjęć mikroskopowych. Wstępne wyniki badań dowiodły, że mikrostruktura gliny uległa wyraźnym zmianom na skutek zanieczyszczenia olejem napędowym. Stwierdzono wzrost porowatości, liczby mezoporów, średnich i maksymalnych wartości obwodu, powierzchni i średnicy porów. Mikrostruktura gliny zanieczyszczonej stała się bardziej izotropowa, na co wskazuje spadek wartości wskaźnika anizotropii mikrostruktury i liczby porów szczelinowatych oraz wzrost średniej wartości współczynnika formy porów. Zaobserwowane zmiany są wynikiem redukcji sił wzajemnego oddziaływania pomiędzy cząstkami ilastymi po zanieczyszczeniu gruntu cieczą o niskiej wartości stałej dielektrycznej.

EN

In this study the effects of petroleum pollution on microstructure of glacial till were investigated. Undisturbed samples of the unaltered soil and the soil contaminated in situ by diesel oil were tested using skanning electron microscope. Quantitative analysis of microscopic photographs was conducted using STIMAN software. Results obtained show that the microstructure of the contaminated till changed significantly. The analysis revealed increase in such micromorphological parameters as: total porosity, number of mezopores, pore diameter, pore area and pore perimeter. The microstructure converted to more isotropic, which was supported by decrease in coefficient of anisotropy and number of fissure pores. Variations in the soil microstructure were attributed to diminution of repulsive interparticle forces due to low dielectric constant of diesel oil.