The Effect Analysis Of Reservoir Canyon Topography

Large‐scale hydropower station, reservoir and hydropower control project is generally building on the area of high mountain canyon topography, such as the Lancang River, Three Gorges area and so on. According to experience of seismic disaster, under the action of strong earthquake, mountain landslide, collapse and other geological disasters are usually initiated in the area of high mountain canyon topography, even the security of reservoir project is affected. After sliding in many earthquake disasters, amplification effects are found, where in ridges and convex topography or building，the seismic wave has evident amplification effects. Make a scientific assessment to the effect of reservoir‐canyon topography on ground motion is all grist to give an integrated advisement to the reservoir’s earthquake‐resistance security, and can provide a scientific reference for the seismic design of the dam or control landslides of reservoir banks. The Finite Element Method (FEM) is an effective numerical analysis method, and it has been actually obtains many applications. In the paper, the effects of reservoir‐canyon topography on the ground motion are analyzed by finite element method. Consider the great significance of making scientific assessment for the design ground motion parameters of the area of reservoir‐canyon topography in actual project, this thesis do the research work as following:1. Based on the reservoir‐canyon’s terrain features, towering and steep‐slope type of these two theoretical calculation models is established in the paper.2. In this paper, viscous‐spring artificial boundary is introduced into the simulation of two‐dimensional seismic response, and then used the different wave‐field separation technique to the different boundary, and obtained the centralized viscous‐spring artificial boundary’s equivalent seismic load of each node on bottom boundary and lateral boundary. Through compiling program, realized the ground motion input from the artificial boundary by the form of equivalent seismic load.3. In order to selected represent each earthquake scenario of seismic wave groups, a novel ground motion selection method is introduced into this paper, and the application of this method is used to select natural seismic wave that matching the response spectrum of target site. The common ELCentro ground motion, Tianjin Qian’an ground motion and the artificial ground motions of according to geological structure of Three Gorges area are used as input ground motion to study the effects of different input seismic waves on seismic response of calculation models.4. Using Westergard model, the influence of hydrodynamic Pressure of different water level on ground motion of reservoir‐canyon model is studied.5. Based on the two kinds of representative calculation model, this paper analyze the features of influences of topography, water level and input seismic wave on ground motion of reservoir‐canyon model. Some valuable conclusions obtained from the calculation was expected to provide a useful reference for the scientific evaluation of the ground motion parameter of the area of reservoir‐canyon topography to be more reasonable and scientific．...