Abgeschlossene Abschlussarbeiten
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Folgende Abschlussarbeiten wurden an der Professur für Wasserbau betreut:
Statistical Analysis on particle size distributions and empirically estimated geotechnical design parameters
Art der Abschlussarbeit
Master
Autoren
- Kozhakhmetova, Anel
Betreuer
- Dipl.-Ing. Niklas Schwiersch
- Prof. Dr.-Ing. Jürgen Stamm
Abstract
In geotechnical assessment, uncertainty in soil properties is a familiar concept. There is a need for an adequate understanding of the basic factors, which can affect the safety and stability of a hydraulic structure. In this thesis, geotechnical assessment of soil permeability is considered, through the quantification of uncertainties in the particles size distribution of three different soil samples, and their respective percent finer (D10, D30, D50, and D60), which were used to obtain some basic soil parameters such as uniformity coefficient and coefficient of curvature. Moreover, since the effective soil diameter (D10) can be representative of the soil properties, of the respective samples, its variability (randomness) was exclusively used in the analysis of how uncertainty in particle size distribution affects permeability. The summary statistics (expected value, coefficient of variation and skewness) of the effective grain size diameter was obtained from the best-fitted probability distribution function. Kozeny-Carman equation was used to calculate the permeability value of the three soil samples, considering that the conditions for applying this equation were satisfied by the three soil samples, respectively. The results show that variability in the effective particle sizes impact the range of permeability values. The mean permeability value was found to be highest for the sample with more fraction of bigger size grain diameters. At the other hand, the coefficient of variation of the permeability values was found to be highest for the sample with a higher fraction of mixed soil samples, with distinct grain diameters. With increasing dispersion (confidence intervals) of the grain diameters, the range of permeability values was found to increase as well.
Zugeordnete Forschungsschwerpunkte
- Probabilistische Bemessung von Flussdeichen zur Verbesserung des Hochwasserrisikomanagements
Schlagwörter
statistical modelling, parameter estimate, correlation terms, geotechnical parameter
Berichtsjahr
2019