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| | Abstract | | We have developed SSRT (Shallow Seismic Reflection survey for Tunnels) to evaluate geological conditions ahead of the tunnel face. SSRT is considered one of the most conventional methods capable of using a variety of seismic sources. However, SSRT requires careful arrangement of the seismic sources and sensors, which causes interruptions to tunnel excavating work. Recently, we have achieved a further development of SSRT using tunnel excavation blast as a seismic source, called "SWE (Seismic While Excavation)-SSRT". SWE-SSRT only requires geophones and the recording system and does not interrupt tunnel excavating work. However, SWE-SSRT requires a few days of data acquisition period as well as requires a correct shot time for data analysis. In this abstract, we introduce to apply the seismic interferometry method using tunnel excavation blast for evaluating geological conditions ahead of the tunnel face. |
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