Gátak méretezése módosított RMR tényező figyelembe vételével

A cikk célja, hogy bemutassa a tagolt kőzetkönyezetben épülő gáttestek állékonyságának kiszámításának lehetőségét. A cikk Romana ilyen irányú kutatásait foglalja össze, aki a mérnökgeológiában általánosan használt RMR-módszert fejlesztette tovább (Romana, 2003a; 2003b; 2004). A számításoknál fontos szerepe van a kőzettest alakváltozási modulusának értékének is, melyet ezen tényező ismeretében lehet megbecsülni -– ennek meghatározási módját külön is bemutatjuk

Statistical analysis of CPT tip resistances

Selecting proper values for soil parameters is a crucial aspect in geotechnical engineering. Geomaterials exhibit an inherent, natural variability, which can be assessed by statistical methods. CPT data lend themselves well for statistical analysis, given the large amount of data retrieved in a single test. The aim of this study was to examine the guidelines for statistical parameter estimation set out in Eurocode 7, as applied to CPT tip resistances. First, the guidelines and methods for estimation of fractiles and mean value with a given confidence level were reviewed. Second, a number of 125 CPT datasets were analyzed: the goodness-of-fit tests have shown that the common assumption of a normal distribution does not hold. Third, different estimation methods for the 5% fractile, the mean and the median were evaluated with regard to robustness and efficiency

ICAR: endoscopic skull‐base surgery

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Water retention functions of sand mixtures

The water retention curves of three sand fractions and 12 continuous and gap-graded 2-component sand mixtures were measured. Due to the unexpectedly long equalization times, the tests (involving 11 suction steps) lasted longer than two years. In this paper, two methods for predicting the water retention properties are considered which use the grain size distribution as primary input. In particular, the data are used to validate a pedo-transfer model which is based on the pore size distribution of a soil

Modified Grading Curve – SWCC Relations

In the ongoing research a topological interpolation method was elaborated over the N -1 dimensional space of the grading curves – represented by a N - 1 dimensional simplex - using c N2 data. The surface is selected on the basis of the grading entropy concept and the interpolated function is extended to the whole simplex by the grading entropy map. In this paper the method is further developed. The extended method is illustrated using the examples of the dry density and the parameters of the van Genuchten soil water retention function