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Wpływ kształtu cząstek ilastych na wyniki analiz granulometrycznych gruntów spoistych

Gorączko A., Topoliński S.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2018

Vol. 27, No. 2

142--151

Pomiar wielkości cząstek za pomocą dyfrakcji laserowej (LDA) jest alternatywną analiz hydrometrycznych (HM) metodą oznaczania składu granulometrycznego gruntów. Przy oznaczaniu frakcji najdrobniejszych, o znacznej zawartości minerałów ilastych, zasadnicze problemy wynikają ze znacznej anizotropii kształtu cząstek. W pracy zawarto porównanie wyników oznaczeń wielkości cząstek iłów neogeńskich z Bydgoszczy. Zaproponowano formuły służące do transformacji wyników metody areometrycznej i metody dyfrakcji laserowej dla badanych gruntów.

Laser diffraction particle sizing is an alternative method to determine grain size analysis in soils. However, for particle with high shape anisotropy LDA measurements usually produce different results than traditional hydrometric methods (HM), based on Stokes equation. The article contains the results of analyzes of Neogene clays characterized by significant lithological differentiation in regard to participation the clay fraction particles. The research was conducted for the clay samples taken in Bydgoszcz. A set of equations to transform LDM results to hydrometric results was proposed.

Zastosowanie oznaczeń uziarnienia metodą dyfrakcji laserowej (LDA) do oceny zróżnicowania iłów neogeńskich z Bydgoszczy

Gorączko A., Topoliński S.

Przegląd Geologiczny

2017

Vol. 65, nr 4

243--250

Laser diffraction particle sizing is increasingly used in grain-size analysis. Commercially available laser analyzers have a number of practical advantages such as detailed particle sizing over a broad size range, built-in ultrasonic dispersing system, and short time of analysis. Grain-size measurements based on laser diffraction analysis (LDA) are characterized by high-repeatability and high accuracy. However, there is no standardized test procedure especially because the research methodology should depend on the type of land. LDA-based measurements of fine-grained sediments rich in clay minerals can contain untrue information due to high anisotropy of participle shape. This causes the optical particle diameter measured by the laser is much larger than that determined as the equivalent spherical diameter in traditional sedimentation techniques for grain-size analysis. This results even in twice reduction of clay fraction quantity, while the silty particles are overestimated in relation to traditional techniques based on Stoke’s law. The aim of this article is to assess the possibilities of using laser diffraction methods for the identification and differentiation of clayey sediments with common origin. The article provides the results of analyses of Neogene clays characterized by significant lithological differences with respect to the participation of clay fraction particles. The research was conducted on clay samples taken in Bydgoszcz. Significant differences in the content of clay fraction particles were found in relation to the applied methods of grain-size analysis. However, as statistical tests showed, results obtained using the LDA method could be useful to characterize lithological variability within the tested soils.