The authors investigated the uplift mechanism of open cut tunnel in the liquefied ground based on shaking table tests. As a result, it is clarified that the uplift dependent on the condition of liquefied ground starts when the pore water pressure ratio reaches the initial effective stress and increases suddenly when liquefaction continues and that the characteristics of the load working on open cut tunnels are related with the pore water pressure ratio and shear modulus of liquefied ground. Accordingly, we have proved that the uplift mechanism of open cut tunnel cannot be explained by the balance of the forces in the vertical direction.

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