Yasuyuki KIMURA
Development of a simple method for residual deformation analysis of earth structure in earthquake by the method of slice
Satoru OHTSUKA
In recent years, large earthquakes have occurred frequently.For example, including Niigata Prefecture Chuetsu Earthquake in 2004, Noto Hanto Earthquake in 2007, and Tohoku Region Pacific Coast Earthquake in 2011.Therefore, when designing an earth structure, there is a need to consider level ¶'s ground motion.If we always have to design not less than 1.0 of a safety factor for level ¶'s ground motion. However, it costs a lot.Therefore, for large-scale earthquake¡Çs I think it is reasonable to allow a certain amount of damage, the introduction of the Verification amount of residual deformation is important to evaluate an earthquake resistance of soil structure.Limit equilibrium method of the division method has been widely used for slope stability analysis.A feature of this method is that makes it possible to analyze changes in the soil mass easily separated by a slip plane by assuming a slip plane in some of the ground.
So, I propose a method using a partitioning method based on a rigid-plastic theory of developing and predicting of residual displacement of earth structure during an earthquake.One of the benefits to apply the rigid-plastic constitutive equation is that the representation of the collapse of its own weight due to excessive weight becomes possible.I created a program analysis and to compared the applicability with Power SSA Pro.Moreover, we analyze the collapse for a small model experiment, large model experiment, and the damage by the earthquake off the Tohoku Region Pacific Coast Earthquake in 2011, the following conclusions were obtained.
1) I compared Newmark method, I found it can properly evaluate the deformation problem. In addition, a feature of this method can also check the self-destruct mode.
2) From a comparison with small model experiments, I found that with this technique to reproduce the timing of generating the displacement.
3) I converted to regular waves from the irregular waves and I took account of liquefaction by the total stress.According to this result, total amount of change equals the actual damage. I evaluated the strength after liquefaction with N-value.
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