Tunnel elastic wave exploration method and tunnel elastic wave exploration system used for this

摘要

PROBLEM TO BE SOLVED: To accurately estimate a reflection plane three-dimensionally in front of a pit face in a tunnel by data analysis using a simple algorithm, while suppressing the device cost.SOLUTION: A direct wave is extracted from an elastic wave recorded in a multicomponent recording device 3 for each pit face drilling, an elastic wave speed in the tunnel is measured on the basis of the direct wave data, and a reflection wave is extracted from the elastic wave recorded in the multicomponent recording device 3. A delay time of the reflection wave is measured on the basis of the reflection wave data, and a reflection wave arrival direction is determined in the vertical direction and lateral direction on the basis of the delay time of the reflection wave. A three-dimensional position of the reflection plane of the elastic wave is estimated on the basis of the results of the analysis of the reflection/diffraction wave related to one single-component seismometer (3-1) and the determination in the reflection wave arrival direction.SELECTED DRAWING: Figure 1