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3-D finite element analysis of landslide prevention piles


Authors: Fujisawa, K., Tohei, M, Ishii, Y., Nakashima, Y., Kuraoka, S.
Source: Landslides and Engineered Slopes: From the Past to the Future.
Pages: 7
Date: 2008-06-15
Location: Xian, China

Abstract
The landslides prevention piles is one of effective countermeasures against landslides. The design of landslides prevention piles is usually conducted by 2-dimentional analysis. Recently, 3-dimentional limit equilibrium analysis such as Hovland method is applied in order to achieve rational design of piles. In this method, stabilizing force (The force to achieve planed factor of safety) is calculated. Then, this force is divided by the number of piles in order compute the load that need to be carried by each pile. It is assumed that stability force is uniformly distributed to the piles. However, landslides have 3-dimentional (3-D) geometries. For instance, thickness of moving body, slip surface angle and material constants for soils are not uniform. Therefore, the load that acts on each pile is different and load may exceed the capacity of piles. For this case, it is possible to apply 3-D finite element analysis that models 3-D geometries of landslide mass and each prevention pile. This paper presents study of 3-D finite element analysis for simulating restraining mechanism of each piles constructed in landslide that is triggered by groundwater. Especially, this paper presents modeling techniques for slip surface using joint element and group of piles with 3-D beam elements. Simulation of actual pile behavior has been performed to validate the model. Possible application for rational design is also discussed.

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This paper was added to our catalog on Thursday 26 November, 2009.

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