Study On Global Stability Of JinPing High Arch Dam

Along with the westward exploitation putting into practice, many high arch dams will be built in the southwest of China where water resources are rich. High arch dams usually have large reservior, and it will be dangerous if dam-break happens. So it is necessary to do research on the stability of the high arch dam. Combined with the project supported by National Natural Science Foundation of China, the stability of Jinping high arch dam is studied by geomechanics model test and nonlinear FEM analysis.At first, the basic theories of geomechanics and nonlinear FEM are introduced, and then, combined theory with practice, analysis is presented with Jinping high arch dam project. Specific analysis steps are as follows:1) Three-dimensional geomechanical model test is conducted, based on the topography and geologic character of Jinping high arch dam and faults which controll the stability of the project. Failure test with overload method is performed and the results are analyzed.2) Nonlinear FEM calculation is conducted. Make full use of the powerful mesh generation of Ansys and the powerful nonlinear calculation of MARC, the mesh of Ansys is led to MARC through programme. This solves the problem that Ansys and MARC have no direct interface. And then add boundary displacement by program to improve work efficiency. Subroutine hypela in MARC is used to verify the constitutive matrix, which is derived by author; the results indicate that the matrix is correct. Finally, the results of nonlinear FEM is analyzed.3)Compare the results of geomechanic model test with nonlinear FEM, obtain the destruction process﹑destruction condition and safty factor K_p=7.0～8.0.