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| 概要 |
液状化対策として固化処理された改良地盤では,対象地盤の土質の不均質性や,固化材の混合の不均一性などの原因により,液状化強度の空間的なばらつきが生じることが報告されており,その地震時沈下挙動は未解明な点が多い.本文では,強度のばらつきを表現した模型地盤を用いて振動台実験を行い,地震時沈下挙動を明らかにしたうえで,地盤改良効果について考察した.さらに,鉛直ひずみの深度分布に着目した,地震時沈下量の簡易...予測式を提案し,一次元でなく二次元方向で改良パターンを考慮すれば,精度が高くなることを明らかにした.本式は今後の研究により,固化処理地盤の品質評価手法の発展等に寄与できると考えられる.
The anti-liquefaction ground improved by cement-mixing and permeable-grouting shows the spatial variability of liquefaction strength resulting from the spatial variability of original soil profile before treatment, the non-uniformity of mixing and grouting, etc. The seismic behavior of improved ground with the spatial variability of liquefaction strength, however, has not been fully clarified. In this paper, in order to evaluate effects of spatial variability of liquefaction strength on the seismic behavior of improved ground, a series of model experiments has been carried out through investigating the seismic behavior of partially improved ground using shaking table test. Moreover, the estimation of seismic settlement considering the depth distribution of vertical strain in terms of 1 dimensional (1D) and 2 dimensional (2D) improvement patterns has been proposed. It can be seen that estimated seismic settlement from 2D improvement pattern shows better agreement with observed settlement than 1D estimation.続きを見る
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