Research on random-fuzzy method for selecting rock parameters in Hydroelectricity Engineering

Based on randomness and fuzziness of geotechnical material physical and mechanical character,the geotechnical material parameter can be defined by two type of undefinitude random-fuzzy variable,the inherent undefinitude of geomaterial and the error of geotechnical material physical and mechanical testing can be expressed by random and fuzzy.The result indicates that the characteristic of geomaterial mechanic parameter not only has random character,but also shows ambiguity;r andom-fuzzy method is proved that reflecting geomaterial inherent character,and therefore establishes the base o f application to engineerings.