ABSTRACT
Ryukyu limestone formation is widely distributed over the Ryukyu Archipelago, and it is highly distrubed by the existence of faults resulting from the tectonic movements of the Ryukyu platelet. The faults in the Okinawa Island have generally the normal faulting characteristics. Recently a rock-cut project along the Urasoe fault zone having a NW-SE direction in the Urasoe City was undertaken and rock mass was highly fractured. The authors utilized an elastic wave tomography method to evaluate rock mass conditions besides the boring exploration. In this study, the outcomes of non-destructive elastic wave velocity tomography investigations and geological investigations are presented and they are used in the stability assessment of the rock cut.
