科研之友
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摘要
The monitoring of landslides in the Three Gorges reservoir area and the research on its mechanism has attracted significant academic attentions. A sub-pixel correlation method dedicated to analyze the TerraSAR-X intensity images is applied to map the displacement field of the Shuping landslide from May 20 to August 5 in 2009. The characteristics of the movement in this period fit well with the terrain of Shuping area. Moreover, the deduced land slide movements agree well with the field observations. We carry out a finite element numerical simulation of the Shuping landslide process constrained using the high resolution and accurate landslide displacement data combined with field observations on slide material geometry, material properties, and the boundary conditions. The landslide mechanisms are determined by providing constraints on the geometry of the slide model and the fluctuation of the reservoir water level and adjusting the rainfall caused materials parameters variation of the model during the finite element numerical simulations. It can be inferred from the numerical simulation that the sliding material properties manifested the displacement magnitude and the properties of the weak sliding belt controlled the pattern of deformation. Based on the simulated landslide mechanism, we conclude that the rainfall played a much more important role than changes of the reservoir water level in manifesting the Shuping landslides.
- 出版日期2016-7
- 单位北京大学
