Applicability of simple method for determining space of grid in soil cement mixing walls

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  • UCHDA Akihiko
    Research & Development Institute, Takenaka Corporation
  • TAYA Yuji
    Research & Development Institute, Takenaka Corporation
  • HONDA Tsuyoshi
    Research & Development Institute, Takenaka Corporation
  • TSUKUNI Shoichi
    Technology & Production Development Division, Takenaka Civil Engineering & Construction Co., Ltd.
  • KONISHI Kazuo
    Technology & Production Development Division, Takenaka Civil Engineering & Construction Co., Ltd.

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Other Title
  • 格子状地盤改良工法における格子間隔簡易設定法の適用性

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Authors proposed the simple method in the previous paper that determined the space of grid of the soil cement mixing walls used as a liquefaction countermeasure. In order to improve the reliability of the simple calculation method, the seismic response analysis was conducted with the parameter of the space of grid, the shear modulus of the improvement, and the improvement length. Based on the analysis, three functions that composed the expression were reviewed. The reviewed method can evaluate the maximum horizontal shear stress of the ground inside of grid based on the seismic response analysis. <br>This simple method applied for building foundations that experienced a real large earthquake. Results of the method compared with the analytical result and the field investigation after the earthquake. The Fl value calculated by this method was evaluated on the conservative side, and had adjusted to the field investigation result. Therefore, it is thought that the simple calculation method proposed in this study is effective for the preliminary setting of a space of grid on the soil cement mixing walls.

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