| Jisha hydropower station is located on Shuoduogang River which is the branch of Jinsha River in Hutiaoxia Town of Diqingxianggelila County of Sichuan Province. The barrage of the Jisha hydropower station ,which is a concrete gravitational dam, has two external holes, one sand-sweeping hole and a hole which discharges flood and sweeps the sand, the last two holes are on the same segment of the dam. The dam's width of the station is narrow, but it has too many holes in the dam, such as: the hole which discharges flood and sweeps the sand, the sand-sweeping hole, one grouting gallery, one arc-shaped work door, and a flat-panel door which prevents the trouble and so on. So the dam is a much more complex structure. Entrusted by National Hydraulic and Electric Engineering Limited Company in Beijing, the thesis will analyze the stress distribution of the whole dam with 3-D finite element analysis method, then provide the basis for the structural and bodily form design of the dam.This thesis makes out some significative work besides analyze the project, such as:1. In selecting the range of the dam foundation, the thesis analyzes the impact on the stress of the dam by finite element analysis method and finite-infinite element method in choosing different dimension of the foundation. In this thesis six-times of dam's height was chosen as the range of the foundation.2. While this dam is low, the stress in the hell of the dam relatively small, we try making the hell become round and then treat the maximum stress as the referenced in the hell of the dam, besides thickening the mesh of the finite elements and treating the length of the tensile stress as the criterion, according to the code in the region of the dam hell.3. This thesis made some programs, using IPDL language of ANSYS software, about uplifting pressure and pseudostatic-seismal load as they are peculiar when put on the dam. It also made a program which changing the stress integral to the force in an arbitrary section. Comparing to the stress-path integral and AUTOCAD method, this program has a wider use and much more accurate result, so it will get relatively high practical value. |
