Experimental Study on Seismic Retrofitting Technology that Complements Existing Pile Foundations with Soil-Cement Columns made with Cementitious Solidification Material

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  • Tomisawa K.
    （独）土木研究所寒地土木研究所 寒地基礎技術研究グループ 寒地地盤チーム
  • Maki T.
    埼玉大学大学院 理工学研究科
  • Watanabe T.
    北武コンサルタント（株）
  • Sasaya T.
    （株）フジタ 技術センター 土木研究部

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Other Title
  • 既設杭基礎にセメント系固化材による地盤改良体を併設する耐震補強技術に関する実験的検討
  • キセツ クイ キソ ニ セメントケイコカザイ ニ ヨル ジバン カイリョウタイ オ ヘイセツ スル タイシン ホキョウ ギジュツ ニ カンスル ジッケンテキ ケントウ

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Abstract

Inadequate seismic performance of foundations during an earthquake causes excessive response displacement of the superstructure, which may degrade the functions of the entire structure. Thus, like the seismic reinforcement of superstructures and substructures, reinforcement measures are considered necessary for the existing foundations of structures that could not be provided with the required seismic performance, including liquefaction countermeasures. Consequently, as a reasonable seismic retrofitting technology for foundations in soft ground or liquefied ground, composite piles that provide soil-cement columns made with cementitious solidification material around pile foundations were researched and developed. Composite piles differ from conventional foundation seismic reinforcement methods that integrate reinforcement piles, reinforcement material or soil-cement columns with the substructure in that they represent a technology that aims to secure seismic performance of existing pile foundations solely through the reaction force of soil densification columns, and they are considered advantageous in terms of executability and cost. A series of large-scale experiments on the practical application of composite piles was conducted and findings on their seismic performance centering on the energy absorption effect are reported.

Journal

  • Concrete Journal

    Concrete Journal 51 (6), 499-506, 2013

    Japan Concrete Institute

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