Research of the Tunnel Soundness Diagnostic Methods for the Time-Dependent Deformation in Tunnel

Abstract

Characteristics of rock minerals and the geological properties of the tunnel which occurred the heaving as a tunnel deformation after its completion are investigated. And we also carried out a study for a diagnostic method in actual tunnel with time-dependent deformation using seismic velocity in order to evaluate the soundness of tunnel ground. The mainly geology of this tunnel is dacite, pyroclastic rock and andesite lava. These rocks have been altered by hydrothermal alteration. As a result of mineralogical test, the information of the combination of minerals is effective for the one of indexes the prediction of swelling and the deterioration of the rock have been indicated. As the result of seismic refraction survey, the seismic velocity of non-deformed section is higher than deformed section. Moreover, it is suggested that the soundness of rock mass can be evaluated by the decrease ratio of seismic velocity.