格子状改良体で拘束された地盤の簡易液状化評価法
砂のせん断ひずみの蓄積による累積損傷の概念と均質化法による等価な地盤せん断モデルを用いた格子状改良地盤の簡便な液状化評価法を提案した。評価法は、必要な諸定数の物理的な意味が明確であり、地震外力の評価だけでなく異なった地盤の影響を合理的に評価できる点に特徴がある。まず、提案法の考え方について示し、次に実案件を例とする具体的な計算方法を提示する。
A Simplified Method for Evaluating the Liquefaction of Sandy Soil Confined by a Lattice-type Deep Mixing Wall.
A simplified method for evaluating the liquefaction of sandy soil confined by a lattice-type deep mixing wall is proposed in this paper. The method calculates the accumulative excess pore water pressure from the initial shear strain using an equivalent shear-stiffness model by homogenization method. The method uses only parameters that are clear in their physical meaning, and can evaluate not only the effect of variations in the external forces, but also the physical properties of the ground. This paper first explains the proposed idea and then presents a specific calculation procedure using an actual site plan.