L'articolo di Horvath linkato da Michele è una recentissima revisione preparata da un autore che nel corso degli anni si è occupato tra l'altro specificamente di questo argomento. tra l'altro Horvath puntualizza qualcosa che ripetiamo da anni in questo forum, ossia che per ricavare un corretto winkler secondo definizione dobbiamo conoscere i cedimenti, sarebbe quasi come dire che per ottenere un risultato dobbiamo già conoscere il risultato stesso.
Because there is still very much a significant role for subgrade models in current geotechnical
and structural engineering practice and research this means the long-unfulfilled need for a
subgrade model that is a theoretically sound yet practical-to-use improvement to the inherently
and seriously flawed Winkler's Hypothesis, which originated in the 19th century, still exists1. Past
research has shown that efforts to develop such an improved model date back to at least circa
1940 and are thus more than 70 years old at this point in time (Horvath 1979, 1988, 1989).
The theoretical flaws and shortcomings inherent in Winkler's Hypothesis have been discussed in
numerous publications over the years. However, as noted in the Executive Summary of this report the
subtle implication that these flaws have on the generic Coefficient of Subgrade Reaction (CSR), which is
defined simply as the ratio p(x,y)/W(x,y) and is fundamentally a calculated result in SSI analyses, appears
not to have been fully understood and appreciated by users. Colasanti and Horvath (2010) present a detailed
discussion of not only the well-known flaws and shortcomings of Winkler's Hypothesis but also clearly
explain the significant implications these shortcomings have on turning the CSR from an initially-unknown
problem result to a required problem input that must be known correctly beforehand if correct results are to
be obtained using Winkler's Hypothesis.
