Abstract:In order to carry out an effective and rational inverse analysis of physico-mechanical parameters of dam concrete and its bedrock materials,an inverse analyzing method based on lamellar element FEM is proposed. By setting up lamellar elements in general 3D FEM to simulate the dam concrete cracks and the bedrock conformations such as fault,weak interlayer and cracked belt,the inverse analysis method proposed can effectively simulate the interfacial characteristics of opening,cutting and sliding. Both the principle and method of lamellar element FEM are presented,and then a practical method and its operation steps of parameter inverse analysis based on lamellar element FEM is proposed to obtain the dam concrete elastic modulus and bedrock deformation modulus. The calculation of an engineering example shows that the inverse analysis method based on lamellar element FEM can reflect the real conditions of dam structure and the bedrock conformations more objectively than that based on the conventional 3D FEM,and so the parameters calculated by the proposed inverse analysis method are more reasonable and reliable than the latter.