The potential of seismic monitoring during urban tunnel boring


   Department of Earth Sciences

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  Assoc Prof Paula Koelemeijer  No more applications being accepted  Competition Funded PhD Project (Students Worldwide)

About the Project

Severe geological changes ahead of a tunnel boring machine pose a risk to boring operations. Techniques such as seismic-while-drilling (SWD, Petronio & Poletto, 2002) are used in real-time to monitor geological changes ahead of the tunnel boring machine. In addition, numerous monitoring boreholes are drilled to monitor the tunnel and subsurface post-construction using a variety of geophysical observations. However, these monitoring boreholes increase the costs of engineering projects substantially. Besides being used during monitoring engineering projects, these boreholes offer an opportunity for generic subsurface monitoring and imaging, especially in urban settings where seismic noise levels are typically high at the surface. However, these boreholes are typically very narrow (10cm wide) and located in public spaces, limiting the deployment of expensive seismic equipment. In this project, you will investigate to what extent real-time seismic monitoring can detect subsurface changes during and after drilling operations. In addition, we will study the additional insights seismic instruments placed in monitoring boreholes provide into general subsurface structure and background seismicity in urban settings.

Geology (18)

References

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Díaz, J., M. Schimmel, M. Ruiz & R. Carbonell
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Green, D., I.D. Bastow, B. Dashwood, & S.E.J.
Nippress (2015). Characterizing Broadband
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10.1785/0220160128
Lecocq, T., S.P. Hicks, K. Van Noten, K. van Wijk,
P. Koelemeijer, R.S.M. De Plaen et al. (2020a).
Global quieting of high frequency seismic noise
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10.1126/science.abd2438
Morgan, T., R. Ghail, & J. Lawrence (2021). Major
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Petronio, Lorenzo & Poletto, Flavio. (2002).
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 About the Project