| The Duncan-Chang nonlinear constitutive model and the Shen Zhu Jiang's double-yield-surface elasto-plastic constitutive model is introduced into ANSYS FEA software firstly based on the User Programmable Features of ANSYS for there is no fit constitutive model for soil material in ANSYS. The influence of the relative parameters on the two models is studied in detail, and the general method to introduce any constitutive model to ANSYS is obtained.Secondly, the model is used to analyze the Xia Ban Di rockfill dam. In this project ,the maximum height of the dam is 81m, but the deep overburden in the riverbed has the depth of 147.95m which is about two times of the maximum height of the dam body, so the seepage and liquefaction prevention of the dam foundation becomes the key and important problem in the design of the dam project. The static stress and deformation under three different projects -horizontal blanket project, clay core project and asphalt core project-for the dam is analyzed comprehensively. The damage that may be induced by variable factors on the dam body in time of engineering completion and water impounding operation period is seriously studied. In the analysis, some technical problems that may be encountered in analyzing problems with deep overburden are well solved.Thirdly, because the depth of the seepage prevention wall of Xia Ban Di dam project has the value of 85m which is the maximum depth in the dam projects in our country, the stress state of the seepage prevention wall is very complicated, the influence of nine modulus for nine kinds of seepage prevention wall material on the stress and displacement of the seepage prevention wall is studied and the rule of the change of stress and displacement with the changeof characteristic parameters for seepage prevention wall under time of engineering completion and water impounding operation period is given in this paper. |
