Simulation of Quasi-3D Slope Stability in Multi Layered Hill Slopes

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概要

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• The hydro-geological properties of a natural hill slope are almost always heterogeneous and anisotropic. The complexities in slope stability analysis resulting from this variation in properties can be handled by dividing the geological formation into many layers, each layer representing a specific type of material. A slip surface may form in such formations at the boundary between two different material types. This is especially true when a material with higher hydraulic conductivity lies over a lower hydraulic conductivity material. In this kind of situation the percolating water flows downhill mostly at the boundary between the layers, eventually creating a slip surface. A method of simulation of quasi-3D factor of safety (FOS) of a multi layered geological formation with slip surfaces along the boundary between layers is proposed. In this method, a finite difference 3D groundwater flow and transport model was used to simulate groundwater fluctuation. Using spreadsheet, the resulting hydraulic heads of each soil column were converted into pore water pressure. The geological formation was divided into a number of sections, each of unit thickness. Using appropriate soil properties, geology of the area, and the resulting pore water pressure, the FOS of each section was calculated by using a 2D slope stability analysis method. The resulting FOS fluctuations for each section were simulated by a 3D graphical simulation package. Thus, a quasi-3D slope stability simulation was achieved by combining 2D analysis methods with a 3D groundwater simulation method. This method can be used to simulate changes in hill slope FOS due to dynamic changes in input and or extraction of water, and in hill slopes with multiple slip surfaces.

• 愛媛大学の論文

著者

• Shrestha Hari

  Grad. School Of Science & Engineering Dept. Of Civil & Environmental Engineering Ehime Unive

• Yatabe Ryuichi

  Dept. Of Civil & Environmental Engineering Ehime University

• Bhandary Netra

  Dept. Of Civil & Environmental Engineering Ehime University

関連論文

• Characteristics of Leachate from Citrus Groves and their Changes in the Collecting Reservoirs in Matsuyama, Japan
• Simulation of Quasi-3D Slope Stability in Multi Layered Hill Slopes

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