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  Fuzzy Logic model for the estimation of the unconfined compressive strength of the Ituango gneiss

  Knowledge of the unconfined compressive strength of the rock is one of the key aspects for the comprehension of the rock mass behavior, which is requested for design tunnels and underground constructions. The fuzzy system proposed have as input variables basic characteristics of the rock, such as: degree of alteration, foliation and grain size, which are interrelated through membership functions, that maps each element of the universe of discourse to its range. For this case unconfined compressive strength test results were used, carried out for the gneiss found at the Ituango hydroelectric. The geological surroundings are conformed by gneiss, of which structure varies from schistosic to migmatitic; folded and with textural and mineralogical differentiations associated to the variability of the metamorphism. This characteristic reflects on the mechanical behavior of the rock, showing a wide range for the unconfined compressive strength values.

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