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  Availability of evaluating ground condition using geophysical exploration in mountain tunnels

  Recently, continuous ground displacements have resulted in damage to the lining of, or floor heaving in several Japanese tunnels. Since there is no diagnostic method for these longterm ground deformations, a technical method for evaluating the health of ground is needed. A diagnostic method is required that uses a standard index to evaluate the ground condition continuously from construction through maintenance. Seismic exploration is an effective method for evaluating the ground health in this way It is necessary to secure the reproducibility to evaluate the results of seismic exploration repeatedly.

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