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Wpływ zanieczyszczenia olejem napędowym na zmianę uziarnienia, plastyczności i pęcznienia neogeńskich osadów zastoiskowych z rejonu Dobre

Izdebska-Mucha Dorota, Gawriuczenkow Ireneusz, Jarominiak Konrad

Przegląd Geologiczny

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2024

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Vol. 72, nr 12-2

789--797

EN

Petroleum products are hazardous to the natural environment, as well as to the stability of underground infrastructure and foundations. Numerous studies have reported negative changes in the geological and engineering parameters of soil contaminated with hydrocarbons. In Poland, the impact of pollution with petroleum hydrocarbons on the physical and mechanical properties of soils is still poorly understood and requires studies considering soil lithology, duration of the pollution and the type of pollutant. The soil tested in this study was Neogene limnic soil, collected in the Dobre area, composed of 12.5% clay, 46.5% silt, 41% sand, and kaolinite as the dominant clay mineral. Soil samples containing 0%, 2%, and 6% of diesel fuel (ON) were prepared in laboratory to simulate long-term contamination. With the increase in ON content, the clay content decreased by approximately 4% points, resulting in a classification change from loam (G) to sandy silt (Rp) for the 6% ON sample. Greater differences in particle size distribution were observed using the hydrometer method compared to the micro aggregate method. Compared to the 0% ON sample, contaminated samples showed an increase in the values of Atterberg limits, plasticity index, consistency index and activity. This changes align with literature data for soils of kaolinitic and illitic composition. Consistent with its lithological composition, the tested soil showed low values of the sorption and swelling parameters, indicating low potential expansivity. Although there was a slight increase in the MBC sorption capacity, cation exchange capacity and specific surface area, the contaminated soil samples revealed lower values of free swelling and higher values of swelling pressures compared to the uncontaminated soil. However, the macroscopic observation of samples after the free swelling test and the reduction in the adsorbed water content after the swelling pressure test point to the conclusion that due to the presence of hydrocarbons in the soil structure, its potential for sorption capacity and volume changes was reduced. This research demonstrates that even a relatively low level of soil contamination with petroleum-derived compounds resulted in a change in its geological and engineering properties. Due to the limited data, the presented conclusions require further research applying higher degree of soil contamination. It was also shown that a careful and comprehensive analysis of test results is necessary for the proper interpretation/assessment of the results of standard tests but conducted for non-standard soil material, where the pore liquid consists of water and hydrocarbons.

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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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Skład mineralny gruntów spoistych a ich właściwości deformacyjne

Gawriuczenkow Ireneusz

Geologos

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2007

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Vol. 11

455--462

PL

W artykule przedstawiono wpływ zawartości minerałów ilastych na niektóre właściwości deformacyjne gruntów spoistych, takie jak pęcznienie, ciśnienie pęcznienia, odkształcenie. Badania przeprowadzono na próbkach o strukturze naruszonej i modelowanym składzie mineralnym. Zbadano wpływ najczęściej występujących minerałów ilastych w gruntach spoistych (beidellitu i kaolinitu) na właściwości deformacyjne.

EN

The paper presents influence of clay mineral composition on selected clay soils deformation properties, namely: free swell, swelling pressure, strain. The examined samples had disturbed structure and modeled mineral composition. The influence of the most occurring clay minerals (beidellite and kaolinite) on the deformation properties of soils were tested.