Based on the fuzzy theory, the fuzzy identification algorithm of the soil consolidation parameters is set up according to the measured pore water pressure posited in the inner soils. The subordinate functions are also built in accordance with the statistic charactersistics of the observed pore water pressure. The fuzzy objective functions and the subordinate functions with fuzzy restriction are established too. Based on the information theory, the influence of uncertainty of the observed information and the uncertainty load to the identified results is studied. The research makes known that the identified results are still uncertain by making use of the above proposed identification algorithm.

Based upon the horizontal displacements data in-situ in the top of concrete gravity dam, the parameter identification problem is done with the regularizing least squares method for the elastic modulus of the concrete gravite dam. The iterative format and selecting algorithm of the regularizing parameters are set up. It is also put forward to identify material physical properties according to the priori information. The practical use of the parameter identification algorithm proposed shows that this algorithm has fast convergence speed and good stability.