A geotechnika területén a talajok víztartási függvényének alkalmazási köre és laboratóriumi mérésének tapasztalatai: The Application of SWCC and the Experiences of its Laboratory Measurement / Aplicarea SWCC și experiența măsurătorilor de laborator

One of the key issues in unsaturated soil mechanics is, the features of the water function. Most engineering tasks affecting the unsaturated soils can be solved by the well-known soil mechanics examinations. In this article, we describe the scope of application of this soil characterization, together with our own measurement experiences. Kivonat A telítetlen talajmechanika egyik kulcs kérdése, a vizsgált talaj víztartási függvényének isme­rete, így a telítetlen talajzónát érintő mérnöki feladatok döntő része –a jól ismert talajmechanikai vizs­gálatokkal kiegészítve – megoldhatóvá válik. A cikkben e talajjellemző alkalmazási körét, meghatáro­zási lehetőségeit ismertetjük, kiegészítve saját mérési tapasztalatainkkal. &nbsp

Soil parameters in terms of entropy coordinates

In the ongoing research, an approximate, grading entropy based, advanced interpolation method is applied to establish empirical functions between the grading curves and the model parameters of sands. The space of the grain size distribution curves with N fractions is isomorphic to the space of the unit-sided simplex with dimension N-1. The traditional interpolation over the simplex with dimension N-1 is problematic since the number of the sub-simplexes (and the interpolation points) may increase exponentially with N. To overcome this difficulty, the function is approximately interpolated, which means that the interpolation is made on some 2-dimensional sections of the simplex and is extended to the whole simplex, using the grading entropy map. Two kinds of 2-dimensional sections can be used based on either fractal distributions or partly fractal partly on some maximal gap-graded distributions. In this paper the experiments were made on the artificial mixtures of natural sand grains earlier. Two kinds of functions were approximately interpolated for the minimum dry density using the measured data. One kind of function was determined for the parameters of an SWCC model directly from the level lines previously graphically interpolated from fractal distribution data