K<sub>0</sub>制御オンライン地震応答実験による地震後の残留変形評価  [in Japanese] EVALUATION OF RESIDUAL DEFORMATION AFTER EARTHQUAKE BY MEANS OF K<sub>0</sub> ON-LINE SEISMIC RESPONSE EXPERIMENT  [in Japanese]

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Abstract

砂地盤の液状化後の残留変形量を評価するため,中空ねじりせん断試験で圧密‐非排水繰返しせん断‐排水の全過程においてK<sub>0</sub>状態を制御可能としたシステムを開発した.それをオンライン実験に適応させ,液状化後の残留変形量に与える初期K<sub>0</sub>状態や入力波,過圧密比(OCR)の影響について評価を行った.実験の結果,入力地震波やOCRの相違によって残留体積ひずみε<sub>v</sub>や残留せん断ひずみγ<sub>r</sub>が変化することを示した.さらに,液状化後の残留体積ひずみと残留せん断ひずみの両方を考慮した残留変形指標を提案し,残留変形指標と累加せん断ひずみγ<sub>acm</sub>に正の相関関係があることを示した.

 The objective of this paper is to evaluate earthquake-induced residual displacement at a ground. I have developed K<sub>0</sub>-controled experiment device. This device achieves K<sub>0</sub> condition during consolidation, undrained cyclic shear and reconsolidation process. The relation between liquefaction-induced residual displacement and duration and overconsolidation ratio OCR are studied by the method. As a result, volumetric strain ε<sub>v</sub> and residual shear strain γ<sub>res</sub> variation with different types of earthquake motions and OCR was examined. We suggested the residual deformation index which could evaluate both residual shear strain and residual volmetric strain. It was associated with accumulated strain γ<sub>acm</sub>.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 68(2), 274-285, 2012

    Japan Society of Civil Engineers

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