A complete set of stability evaluation system for the comprehensive test method of geo-mechanical model has not been formed.Concerning this issue,firstly,according to the basic principle of the three geo-mechanical model methods of failure tests and the basic formula of point safety factor,a relationship on assessing the stability of dams was established based on the comprehensive test method of geo-mechanical models.Secondly,the stability evaluation system was presented based on the deformation monitoring data and the relation curves between the deformation and the overloading coefficient by using the deformation catastrophe theory.The inflection point 1 of the deformation curve was taken as the initial crack feature point,the inflection point 2 as the large deformation feature point.And the overloading coefficients corresponding to the feature points were as the basis of stability evaluation of high arch dam.Finally,the comprehensive test method of geo-mechanical model was applied to study the overall stability of Jinping Ⅰ high arch dam.A 3D geo-mechanical model failure test was carried out under the condition of reinforcement foundation.The deformation characteristics,failure patterns and mechanisms of the dam abutment and foundation were investigated in the test study.The safety evaluation based on the experimental model indicated that the overall stability safety factor of the dam abutment and foundation ranges from 5.2 to 6.0.The research results provide an important scientific basis for the design,construction and safe operation of the project.
