Sensitivity Analysis Of Material Parameters To Nonlinear Response Of Arch Dam

By summing up the research results, the main research methods and current development of the topic that the domestic and foreign scholars on arch dam nonlinear problem of material sensitivity analysis, material nonlinearity problem of arch dam stress distribution of D-P material parameters sensitivity analysis is selected as a research topic of this article. The normal storage temperature rise and drop working condition of basic combination arch dam are elastic-plastic calculated in this paper. And the Y to the displacement of arch dam, the maximum tensile stress, the maximum compressive stress and the plastic zone development are sensitivity analyzed. There is some meaningful for the practical engineering.Hollow sphere thermal-structural coupling field theory and numerical solutions of the comparison shows:The relative error of each point varies, but the number of pan-global energy error0.426%, indicating that the numerical solution obtained is reliable; When the grid is divided into mapped hexahedral elements, dividing the result is better than free; Unit size should be0.25times the thickness of the sphere. Calculation of the dam showed that:most of the area calculation errors are small, pan-dam energy error is less than11.6%.Cohesion unchanged, while increasing the angle of internal friction analysis showed that:the two conditions have in common is the plastic zone was significantly reduced, the maximum equivalent plastic strain decreases occurred in the upstream end of the dam; dam first principal stress significantly reduced maximum occurs at the upstream end of the dam; max dam Y direction occurred in the middle of the upstream and downstream of the dam crest bottom middle. The difference in temperature conditions, the third principal stress is significantly reduced, the maximum occurs at the base of the dam downstream of the right bank; dam Y direction displacement decreases slightly, but did not change significantly; the temperature drop conditions, the third principal stress significantly reduced, the maximum occurs at the upstream end of the right bank of the dam; dam Y direction displacement significantly reduced.Internal friction angle unchanged, while reducing the cohesion analysis showed that:the two conditions have in common is a slight increase of the plastic zone, the maximum equivalent plastic strain increases occurred in the upstream dam at the end was a bit on the left bank; dam first primary no significant changes in stress, the maximum occurs at the end of the partial left bank upstream dam. The difference is temperature conditions, the third principal stress no clear trend, the maximum occurs at the upstream end of the left bank of the dam; dam Y no clear trend in the direction of displacement, maximum occurred in the middle of the upstream and downstream of the dam crest bottom middle. Temperature drop conditions, the third principal stress significantly increased, the maximum occurs at the upstream end of the right bank of the dam; dam Y direction displacement increases, the maximum occurred in the middle of the upstream and downstream of the dam crest bottom middle.Comparative analysis showed that:temperature conditions, Y direction displacement downstream of the dam is greater than the upstream end of the central maximum crest Central Y direction displacement max; temperature drop conditions contrary; range of plastic zone occurs at the bottom and along the rivers upstream dam where the maximum equivalent plastic strain usually occurs in the upstream end of the left bank of the dam. However, changes in the internal friction angle of the plastic zone development, the first principal stress, displacement is more sensitive to the impact of the dam in the Y direction; changing cohesion of the third principal stress, the direction of displacement of the dam Y sensitive. In practical engineering should be noted.