Hermann Schad

Geostatistical analysis of hydraulic conductivity related data based on core samples from a heterogeneous fluvial aquifer

Summary This paper presents a case study for the geostatistical characterization of the hydraulic conductivity field of a fluvial aquifer. An experimental distribution of hydraulic conductivity values was obtained from core samples, which were analysed in the laboratory with regard to their grain size distribution. The geostatistical analysis was performed on (i) hydraulic conductivity data derived from the grain size distributions applying an empirical relationship, (ii) binary transforms of the hydraulic conductivity data using thresholds and (iii) categorical variables obtained by a K-means clustering of the grain size distributions. Although the available data base is rather small, the results show that the investigated aquifer is distinctly heterogeneous and anisotropic with respect to hydraulic conductivity and soil texture.

Fresh concrete pressure in diaphragm wall panels and resulting deformations

When considering deep excavations supported by diaphragm walls, it is well known that it is very important to consider the effects of the construction process.