液状化時の地盤特性のモデル化と表層注入固化対策によるタンクの液状化時の挙動解析
最近の耐震設計では、入力地震動が非常に大きくなり、液状化現象に関しても液状化後の挙動が重要となっている。そこで、本研究では、種々の地盤の動的特性を完全液状化状態も含めてモデル化した。この構成式を用い、部分改良された軟弱地盤に立地するタンクの強震時の挙動を解析した。さらに、ポスト液状化理論を用いて、地震終了後の残留変形量を評価し、安全性の検討を行った。
Modeling the Soil Behavior During Liquefaction and Analysis of a Tank Installed on Soil Reinforced by Chemical Grouting and Subjected to Liquefaction
Recent seismic designs use very strong earthquake ground motions as inputs. Accordingly, the nonlinear behavior of soils, even those in strongly nonlinear areas, must be analyzed In order to understand the soil’s behaviors not only during shaking, but also after liquefaction. In this study, the author modeled the nonlinearity of various types of soil, including completely liquefied soil. A constitutive equation was used for three-dimensional effective stress analysis of the seismic behavior of a tank designed in accordance with old laws and installed on soft ground that had been partly improved by means of chemical grouting. The tank’s structural integrity was examined by evaluating the residual deformation of the soil after an earthquake according to a theory on liquefied soil.
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