ファジィ理論を利用した定常浸透流の観測に基づく飽和透水係数の同定

概要

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When the earth structures, which retain water, are constructed, it is extremely problematic to find outthe permeability which the earth structures have. Laboratory and in-situ permeability tests do not alwaysrepresent actual fields. So, many methods, which identify coefficients of permeability, have beendeveloped. Usually, a limited number of data is observed and only a small amount of information isobtained. The method, which identifies the coefficients of permeability of existing fill-type dams, has beendeveloped by using the fuzzy theory. The observed data have not only stochastic sources of error but alsomany fuzzy ones. The available information (e.g., engineering judgement) can be utilized in addition toobserved data if the fuzzy theory is employed. The identified coefficients of permeability repesents very well the observed seepage behavior. Thecomparison between the coefficients of permeability measured in laboratory and in situ, and identified onesare performed, too. The measured coefficients of permeability in the laboratory are much smaller than themeasured ones in situ. The measured coefficients of permeability in situ are nearer to the identified ones.If many comparisons between the coefficients of permeability obtained by diffdrent methods are performed,reliance of earth structure will be increased.
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