| 摘要 |
PROBLEM TO BE SOLVED: To provide a simplified design method for a grid-shaped improved body in a liquefaction resistance grid-shaped depth mixture treatment construction method capable of simply and speedily estimating a grid pitch required for the grid-shaped improved body. SOLUTION: A unidimensional ground model for a specified case in which the grid-shaped improved body is not buried with varied thicknesses D and N-values of a liquefied layer is formed, and earthquake waves are inputted to determine response waves by unidimensional dynamic analysis. A two-dimensional model for a specified case in which the grid-shaped improved body is buried with varied D- and N-values, strengths of the improved body, numbers of intermediate walls, and grid pitches L is formed to make two-dimensional dynamic analysis. A specific resistance FL is determined, and relation among the thickness D of the liquefied layer, the N-value of the liquefied layer, and the grid pitch L is graphed to satisfy the specific resistance FL>=1.0. The grid pitch L of the grid-shaped improved body to be applied to liquefied ground is estimated using this.
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