Stability Analysis On Underground Caverns Of Pumped Storage Hydropower Station

With the increasing construction of the pump-generator plants, the stability of excavation on underground caverns is becoming more and more important. Most underground houses have high side walls and long span. And there is complex geologic condition in the construction process. Therefore, the key topic in the underground engineering research is the stability of this surrounding rock, the rationality of the support structure and the stability of the crane beam. This paper takes the underground caverns of Hongping pump-generator plant as the background and simulates the whole excavation process. The main contents of this paper are as follows:1. The method of numerical simulation and the theory of elastic-plastic are summarized. The factors influence for the stability of surrounding rock and the breach mechanism of underground caverns are analyzed. The present situation of anchor design theory are summarized.2. The fast building of three-dimensional numerical simulation model in FLAC^3D is proposed on ANSYS platform. This method has fully used the characteristic of ANSYS and FLAC^3D ,also used the merit of VBA language and FORTRAN language, the model is built fast. Working efficiency can be greatly enhanced.3. Using method above, the typical section model is built . By the contrast of the project with support and without support ,the influence of support are analyzed. By doing this, some conclusion and cognition are gained, offering references for the project.4.The typical section model with the rock-bolted crane beam is built. The influence in the stability of surrounding rock is analyzed after the rock-bolted crane beam construction. The rule of displacement and stress, forced characteristic of the cable under wheel-pressure is researched.