To suitably evaluate deformation suppression effect of a counterfort and to determine a rational perpendicular sectional shape on the basis of the evaluation when the counterfort in a counterfort type earth-retaining method is not rectangular.
Assuming a counterfort 2 to be a collective body of a plurality of grids, various combination patterns of the grids are set and three-dimensional FEM analysis is taken for each of the patterns. Thus, deformation amounts (y) of an earth-retaining wall 1 when counterforts having the respective patterns are installed are calculated respectively, and a normalization deformation reduction amount X=(y-y0)/(y1-y0) is calculated from the deformation amounts (y), a deformation amount y0 when there is no counterfort, and a deformation amount y1 when the counterforts are rectangular as the collective body of all the grids, and used as an index to quantitatively evaluate deformation suppression effects by the counterforts having the respective patterns. Based upon the evaluation result, a pattern such that the normalization deformation reduction amount X is equal to or larger than a predetermined value, for example, X≥0.90 is determined as a rational perpendicular sectional shape of a counterfort.
MASAOKA HISAYA
UCHIYAMA SHIN
HOTTA HIROYUKI
Tadashi Takahashi
Yoshifumi Saeki
Kenichi Kawabuchi
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