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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, which enables us to use a variety of seismic sources. However, a conventional SSRT often causes to suspend tunnel-excavating work for a careful arrangement of the seismic sensors and sources, and for the recording. To overcome this problem, we have introduced "SWE-SSRT"(Seismic While Excavation using SSRT) and also a seismic interferometry method as passive source monitoring techniques, that only require geophones and excavation blasting as seismic sources generating pulse signals. While these are quite effective approaches which can be executed without any interruption through tunnel-excavating work, those application is only limited in large tunnel excavation sites where excavation blasting are operated. In this abstract, we introduce a case study of SSRT with seismic interferometry method using drilling noise as an alternative source in such a small tunnel excavation site where a boring machine is only available. |
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