EXPERIMENTAL STUDY ON INFLUENCE OF GROUND NONLINEARITY ON SEISMIC STRAIN TRANSFER CHARACTERISTICS OF UNDERGROUND STRUCTURES

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  • 地中構造物の地震時ひずみ伝達特性に地盤の非線形性が及ぼす影響に関する実験的研究

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<p> In the seismic design of underground structures such as cut and cover tunnel, the interaction between the structure and the ground must be properly evaluated. The interaction depends on the ratio of the shear stiffness Gs of the tunnel box structure to the shear stiffness Gg of the ground (hereinafter referred to as the stiffness ratio Gs/Gg). A model experiment was conducted in which a box model with arbitrarily set stiffness was embedded in a shear tank that caused static shear deformation of the ground using aluminum bar-laminated soil. As a result, it was confirmed that the interaction force acting on the box was reduced compared to the previous findings obtained by equivalent linear modeling of the ground and without considering the sliding behaviour. A method was proposed to introduce a correction factor to account for this reduction, and it was confirmed that the experimental results of the strain transfer characteristics could be evaluated appropriately.</p>

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